Edgefield County One statewide code, county design maps

Barndominium Builders in Edgefield County, SC

Edgefield County is the fifth-fastest-growing county in South Carolina — 25,657 people in 2020, 29,808 by July 2025, a gain of 4,151 — and more than four fifths of that growth landed outside any town. It is also a county where two ordinary assumptions about a South Carolina build come apart. The first is that the state publishes a design wind speed for your county. The Building Codes Council's approved sheet for Edgefield carries three text annotations and eighteen drawn lines, and every one of those lines is red: two matched pairs reading "Seismic Design B" and "Seismic Design C" either side of a boundary, the Council's standard note, and no wind label anywhere on the sheet. The Council's note governs blue lines, and there is no blue line on this map. The second assumption is that a county either zones its land or does not. Edgefield does both: its ordinance is titled, in its own preamble, the "Land Development Ordinance with Zoning Regulations for Portions of Edgefield County," and areas outside a zoning district are called unzoned areas, where the only setbacks the chapter imposes fall on commercial and industrial uses. In the zoned part, the Rural-Agricultural district takes two acres and the schedule prints no height limit at all — just an extra foot of side and rear setback for every foot above forty. The Savannah River is the state line on this flank and the market answers west toward the Augusta–Richmond County, GA-SC metropolitan area, but the code that governs a slab in Edgefield County is South Carolina's, and only South Carolina's.

Edgefield County at a glance

County: Edgefield County
Population: 29,808

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Building conditions in Edgefield County

The building code is the same in every South Carolina county: S.C. Code § 6-9-10(A) requires each municipality and county to enforce the Building Codes Council's codes and to enforce only those, and SC Regulation 8-236(C) bars a local jurisdiction from writing one of its own. The design numbers are not local either, but they are not one number for the state — Regulations 8-1202 and 8-1203 send wind and seismic to the Council's own map for this county, and those maps are drawn as contours, so the figure is read at your address rather than off a county name. What is genuinely local is who issues the permit and inspects the work, what that office charges, the permit procedure it adopted by ordinance, whether your parcel is zoned at all, and the rest of Table R301.2 — frost depth, termite probability and flood — which the jurisdiction fills in for itself.

Build conditions for Edgefield County, drawn from the sourced facts on this page. Every figure above is cited in the quick-facts panel below, with its source and vintage.

The Council's Edgefield sheet draws a seismic boundary and prints no wind speed

South Carolina takes the ultimate design wind speed and the seismic design category away from the residential code's national maps and substitutes the Building Codes Council's own county maps — Regulation 8-1202 replaces IRC Section R301.2.1 and Regulation 8-1203 replaces R301.2.2.1 with "the previously published maps by the South Carolina Building Codes Council." Thirty-five of the forty-six counties have one, and Edgefield is among them. But its sheet is not like the others. Edgefield 15.pdf was downloaded and taken apart on 8 September 2026: it contains no embedded raster image of any kind, so nothing is hidden in a scan, and it carries exactly three text annotations — the Council's standard note, and two matched pairs reading "Seismic Design B Seismic Design C," one pair at each end of a drawn boundary. Alongside them sit eighteen drawn polyline annotations, and every single one is red. That matters because the Council's own note is about a different colour: "Wind speed, shown in miles per hour, applies at all points along the length of its corresponding (blue) line. Interpolation between wind speed lines is determined by the AHJ as permitted by Figure R301.2(4)A of the 2015 International Residential Code." On the neighbouring Aiken sheet the wind contour is drawn in blue and labelled 115 MPH twice, with the seismic boundary drawn in orange; on the Barnwell sheet the wind contour is blue and labelled 120 MPH twice, with the seismic boundary in red. Edgefield's sheet has no blue line and the string "MPH" appears nowhere in it, in any case, in either the raw file or its decompressed content streams. So what the Council publishes for this county is a seismic boundary between category B and category C, and nothing about wind. The gap is filled by the Council's own modification IRC 2021-04, which lets the local building official "delineate the wind design category" within the jurisdiction so long as it does not surpass the figures on the Applied Technology Council's site, and sets a floor at "the lowest wind speed indicated in the prescriptive provisions of this code." In practice that means the wind figure for an Edgefield parcel is a determination the county building official makes, in writing, for your address. Ask for it before a truss or steel package is ordered.

SC Building Codes Council, Wind/Seismic Maps, https://llr.sc.gov/bcc/maps.aspx , and the Edgefield County sheet at https://llr.sc.gov/bcc/PDFfiles/WSMaps/Edgefield%2015.pdf (3,360,017-byte application/pdf downloaded 8 Sep 2026; text layer extracted in both reading-order and layout modes, and the file's compressed content streams inflated and enumerated — 3 FreeText annotations, 18 PolyLine annotations all coloured 1.0/0.0/0.0, no image objects, no occurrence of "mph" in any case); comparison sheets at https://llr.sc.gov/bcc/PDFfiles/WSMaps/Aiken%2015.pdf and https://llr.sc.gov/bcc/PDFfiles/WSMaps/Barnwell%2015.pdf ; Regulations 8-1202 and 8-1203, 2021 Code Modifications, S.C. State Register Vol. 46 Issue 5, 27 May 2022, https://llr.sc.gov/bcc/PDFfiles/2021-Code-Modifications.pdf ; modification IRC 2021-04, SCBCC 2021 Modification Index, https://llr.sc.gov/bcc/PDFfiles/2021-Modification-index.pdf

"Zoning Regulations for Portions of Edgefield County" — and the unzoned part is most of it

The ordinance names its own scope in its preamble, and the wording is the finding: county council enacted what "shall comprise and be known as the 'Land Development Ordinance with Zoning Regulations for Portions of Edgefield County.'" Section 24-3 then sets out the architecture plainly. Seven earlier ordinances — subdivision, airport safety, sexually oriented businesses, manufactured homes, commercial and industrial land development, flood damage prevention, and the weapons firing range ordinance — "are countywide in application and the standards and regulations contained therein will remain in effect in the unzoned area." Zoning regulations "have been added for certain areas of the county, as delineated and shown on accompanying zoning maps," and "Areas not included in a zoning district shall be referred to as unzoned areas." Section 24-4 applies the whole chapter to the zoned areas. Section 24-5 then lists the sections that apply countywide regardless — flood hazard, airport compatibility, townhouses, patio and zero-line housing, bed and breakfast inns, manufactured housing and manufactured home parks, firing ranges, communication towers, scrap and waste, landfills, sexually oriented businesses, camps and recreational vehicle parks, signs, truck transportation, multi-family housing, solar panels, mines and quarries, sewerage treatment, the land development regulations at §§ 24-164 through 24-181, and the administrative sections as they apply to unzoned areas. And then subsection (b), which is the one to read twice: "Additionally, all commercial and industrial uses in the un-zoned area of the county shall meet the following minimum side and rear yard setback requirements" — a table running from 50 feet for general business to 500 feet for outdoor amusements, airports and special industry and mining. Commercial and industrial uses. A single-family dwelling and its outbuildings on unzoned Edgefield ground pick up no minimum lot size, no side or rear yard and no height limit from this chapter at all. The state building code still applies in full, the countywide sections in § 24-5(a) still apply, and the county still issues the permit — but the zoning envelope people expect simply is not there. So the first question on any Edgefield parcel is not which district it is in. It is whether it is in one.

Edgefield County Code of Ordinances, Chapter 24 (Land Development), §§ 24-2, 24-3, 24-4 and 24-5, codified through Ordinance No. 25-26-007 adopted 14 April 2026 (Supp. No. 21), https://library.municode.com/sc/edgefield_county/codes/code_of_ordinances?nodeId=COOR_CH24LADE_ARTIINGE_S24-5REAPZOUNARCO (section text read 8 Sep 2026; the hosting client was verified as Edgefield County, South Carolina, 124 Courthouse Square, Edgefield SC 29824, edgefieldcounty.sc.gov, matching the county's own published address, and the code's root heading reads "CODE OF ORDINANCES COUNTY OF EDGEFIELD, SOUTH CAROLINA"); county code index linked from https://edgefieldcounty.sc.gov/building-permits-applications-and-fees/

In the zoned part: two acres in Rural-Agricultural, and no height limit at all

Where Edgefield does zone, Table 2 at § 24-32 is the schedule, and it is worth reading district by district because the rural districts are not interchangeable. Rural-Agricultural (RA) is the large-lot one: minimum residential lot 87,120 square feet — two acres — with 100 feet of lot width, front setbacks of 50 feet from a major street whether multilane or two-lane and 25 feet from a minor street, a 15-foot side yard and a 20-foot rear yard. Rural-Residential Development (RR) takes 43,560 square feet, one acre, with the same 50/50/25 front schedule and the same 15-foot side and 20-foot rear. Residential Development (RD) is 21,780 square feet, a half acre, with a friendlier 45/35/25 front schedule and a five-foot side yard. General Residential is 12,000 square feet. Every district requires 100 feet of lot width. Two rows in that table repay attention. The maximum commercial building size is 20,000 square feet in RA and 10,000 in RR — a cap on the building, not on the use — while RD, ID, LC and GC carry none. And the height row does not print a number: it prints note (D), which reads in full, "No limits; however, buildings in excess of 40 feet in height shall observe an additional setback from side and rear property lines of one foot for each one foot in height over 40 feet." That is unusually permissive for a tall clear-span bay, and it converts height into a setback problem rather than a hard ceiling. One honest caveat about the same table: the height and density cells for the RR district are published empty — the schedule prints a figure for every other district and leaves RR's blank — so a specific RR height or density answer has to come from the Zoning Board of Appeals or the department, not from the table. Section 24-204(b) sets how height is measured: from the average grade elevation within 20 feet of the structure to the highest point of the building.

Edgefield County Code Chapter 24, § 24-32 (Schedule of lot area, yard, setback, height, and density, by district, for lots on paved roadways), Table 2 with notes A through G, as amended by Ord. No. 24-25-005, § 1(Exh. A), 15 April 2025, https://library.municode.com/sc/edgefield_county/codes/code_of_ordinances?nodeId=COOR_CH24LADE_ARTIIZODISPDEDIRE_S24-32SCLOARYASEHEDEDILOPARO (table read cell by cell from the served markup on 8 Sep 2026; every data row carries eight cells — one label plus the seven districts RR, RD, RA, ID, LC, GR, GC — and the two height rows carry an empty first data cell for RR); district purposes at § 24-29, https://library.municode.com/sc/edgefield_county/codes/code_of_ordinances?nodeId=COOR_CH24LADE_ARTIIZODISPDEDIRE_S24-29ESPUZODI ; measurement rule at § 24-204, https://library.municode.com/sc/edgefield_county/codes/code_of_ordinances?nodeId=COOR_CH24LADE_ARTVIIGEANRE_S24-204ME

A workshop takes the house's building line — and three feet at the back

Edgefield sets no square-footage cap on an accessory building anywhere in its ordinance, which puts it at the permissive end of this axis. What it sets instead is a placement rule and a height rule, and both are specific. Section 24-203(5) provides that "Unless specifically modified below, all accessory uses and structures shall observe the required setbacks applicable to the principal building or use in the zoned areas of the county, as set forth in table 2, section 24-32," and then modifies them in Table 4. The row that matters reads "Auxiliary shed, workshop, storage building": front BL, side BL, corner lot BL, rear 3 feet — where BL is defined at the foot of the table as "Required building line for principal use." A private garage or carport gets the same treatment, as do noncommercial greenhouses, domestic animal shelters and satellite dishes; bathhouses, cabanas and decks take 10 feet at the rear instead of three. So a detached shop in a zoned part of Edgefield must sit at the house's own front and side building lines but may come within three feet of the rear property line, which on a deep rectangular parcel is a genuinely useful allowance. Height comes from § 24-206(b): "If located within the buildable area, accessory buildings shall observe the height limits for the district within which they are located. If located in a required setback area, the buildings shall not exceed 12 feet in height." Read that with note (D) — no district height limit, just a foot-for-foot setback increase above 40 feet — and the shape of the answer appears: keep the shop inside the buildable area and it is effectively unconstrained in height; push it into a setback and it drops to twelve feet. Two more provisions travel with it. Section 24-206(a): "No manufactured home shall be used as an accessory building in all areas of the county." And § 24-203(4), where more than one main building sits on a lot: the required yards are maintained around the group, and the buildings "shall be separated by a horizontal distance that is at least equal to the height of the highest adjacent building."

Edgefield County Code Chapter 24, § 24-203(4) and (5) with Table 4 (Setback Modifications, Accessory Uses), https://library.municode.com/sc/edgefield_county/codes/code_of_ordinances?nodeId=COOR_CH24LADE_ARTVIIGEANRE_S24-203EXMO ; § 24-206 (Accessory buildings and uses), https://library.municode.com/sc/edgefield_county/codes/code_of_ordinances?nodeId=COOR_CH24LADE_ARTVIIGEANRE_S24-206ACBUUS ; dimensional schedule at § 24-32, https://library.municode.com/sc/edgefield_county/codes/code_of_ordinances?nodeId=COOR_CH24LADE_ARTIIZODISPDEDIRE_S24-32SCLOARYASEHEDEDILOPARO (all read 8 Sep 2026)

The ten-acre rule: no limit on employees, buildings, equipment or trucks

This is the provision on this axis that most directly rewards a working shop, and almost nobody outside the county knows it exists. Section 24-208 is headed "Ten acre rule" and reads: "Land parcels and tracts ten acres or larger in the RD Zone may include the following uses, irrespective of the use requirements of table 1, section 24-31 and regulations otherwise applicable to such uses," and then item (1): "Home occupations, without limitation to the number of employees, number of buildings or structures, amount and/or size of equipment and parking, and number of trucks in support of such home occupation; provided, however, that vehicles, equipment and goods produced off site shall not be displayed for sale, lease or transfer." Every one of those five limits is the ordinary constraint a home-occupation clause imposes, and the ordinance lifts all five at ten acres. For someone whose barndominium shop is the business — a fabricator, a contractor's yard, an equipment repair operation, a woodshop with staff — that is the difference between a hobby ceiling and a working one. The one thing it withholds is retail display of vehicles, equipment and off-site goods. Item (2) adds a second allowance on the same ten acres: residentially designed manufactured homes, "provided, no such use shall be located within 100 feet of the nearest property line, and the number of manufactured homes shall not exceed one per five acres, not subject to manufactured home park regulations" — which is a family-land answer for a parcel that would otherwise trip the park rules at three or more units. Section 24-29(c)(1)b names the intent in the district's own purpose statement: the RD district "is also designed to allow greater use flexibility for large tracts, ten acres or more in size, as provided for in section 24-208, ten-acre rule." Note the limit of the limit: it is written for the RD Zone. Confirm the district on the tax map number before the business plan depends on it.

Edgefield County Code Chapter 24, § 24-208 (Ten acre rule), https://library.municode.com/sc/edgefield_county/codes/code_of_ordinances?nodeId=COOR_CH24LADE_ARTVIIGEANRE_S24-208TEACRU ; district purpose at § 24-29(c)(1), https://library.municode.com/sc/edgefield_county/codes/code_of_ordinances?nodeId=COOR_CH24LADE_ARTIIZODISPDEDIRE_S24-29ESPUZODI ; use schedule at § 24-31, county-published clean copy at https://edgefieldcounty.sc.gov/wp-content/uploads/2025/07/24-31-Clean-2025.pdf (all read 8 Sep 2026)

One building department for the whole county, three towns included — and no plan review fee on a house

Edgefield runs a single building and planning office and it covers everything inside the county line. The department's own page states: "The Edgefield County Building and Planning Department is responsible for enforcement of the adopted codes and ordinances regulating development. The Department conducts plan reviews, inspections, and monitoring of all construction and development activities. The services include permitting, plan review, building inspections, code enforcement, and planning services. The staff provides support to the Planning Commission, Zoning Board of Appeals, and Manufactured Home Appeals Committee as well as the County Transportation Committee. The Department is also responsible for issuing building permits and conducting inspections for the Towns of Edgefield, Johnston, and Trenton." That last sentence is worth its own line, because on most of this axis the answer to "who permits inside the town limits" is a different office with a different fee schedule and a different submittal list. Here it is the same office at 210 Penn Street on 803-637-4073, whether the parcel is in Edgefield town, Johnston, Trenton or open country. The fee schedule is valuation-based and priced below several of its neighbours: building by evaluation runs $20.00 for the first $1,000 plus $6.00 for each additional thousand to $50,000; $314.00 for the first $50,000 plus $5.00 per thousand to $100,000; $564.00 for the first $100,000 plus $4.00 per thousand to $500,000; and $2,164.00 for the first $500,000 plus $3.00 per thousand above that. And the line that matters on a house: "Plan Review fees (Commercial Projects Only) — Half of applicable building permit fees." There is no plan review fee on a residential build here at all. Planning-side fees are small — a zoning verification letter is $10.00, a variance or an appeal $100.00, a minor subdivision $10.00, a land development permit $100.00 up to ten acres, $200.00 up to fifty and $300.00 over fifty. Re-inspections run $40.00, then $80.00, then $120.00. Permits are good for 180 days from issuance or from the last inspection and may be extended a further 180 days in writing for justifiable cause, and the county does not refund permit fees on an abandoned project.

Edgefield County Building and Planning, https://edgefieldcounty.sc.gov/building-permits-applications-and-fees/ (served HTML read 8 Sep 2026; the departmental description and the towns served are quoted from the page body); Edgefield County Building and Planning Fee Schedule, https://edgefieldcounty.sc.gov/wp-content/uploads/2024/02/BPfee2023.pdf (112,796-byte PDF downloaded 8 Sep 2026 and read in reading-order, layout and table modes with the label and value columns reconciled across all three); permit duration, extension and refund terms from "Building a Home in Edgefield County," https://edgefieldcounty.sc.gov/wp-content/uploads/2026/01/Residential-Home-Packet-Revised-2025.pdf ; permit portal at https://edgefield.portal.iworq.net/portalhome/edgefield

Also worth knowing before you build in Edgefield County

The county's plan-submittal standard asks for the seismic zone and does not ask for a wind speed: Edgefield publishes a Building Official Manual, and its section 700, "Minimum Recommended Standards for Building Plans," sets out what the cover sheet of a submittal should carry. Item 5 is a "Design Criteria list" of ten entries: occupancy group; type construction; location of property; seismic zone; square footage and allowable area; fire sprinkler requirements if any; height and number of stories; occupant load; land use zone; and current adopted building code. Seismic zone is there. A design wind speed is not — which is the same shape as the Council's sheet for this county, where a seismic boundary is drawn and no wind figure is printed. The two documents are independent and neither cites the other, so this is an observation about what the county asks for rather than a rule about what it will accept; the ordinary practice on a steel or post-frame building is still to establish the wind design with the building official in writing and to have the engineer state it on the drawings. The rest of the manual is worth reading before a supplier package is priced, because it asks for things a brochure drawing does not carry. The foundation plan must "Indicate foundations and footings. Indicate size, locations, thickness, materials and strengths and reinforcing. Show imbedded anchoring such as anchor bolts, hold-downs, and column base plates. Provide geotechnical criteria and assumptions used for foundation design." The framing plans must "Indicate primary structural members, their size, methods of attachment, location and materials for floors and roofs" and "Provide basic design criteria and material specifications." The manual describes itself as recommended rather than mandatory and notes that not every project needs every component — but a wide clear-span building on an unknown subgrade is precisely the case where the geotechnical assumptions line stops being paperwork.
What the county wants in the folder, and the order it wants it in: Edgefield publishes a homeowner-facing booklet, "Building a Home in Edgefield County," and it sets a sequence that costs weeks if it is run backwards. Step one is plat approval: you present a copy of the recorded plat to Building & Planning, and "Your plat will be reviewed by the Planner to determine if the property is suitable for the type of construction you are proposing. Items such as drainage, easements, set-backs, etc. will be checked." Only then do you apply to the Department of Environmental Services for a septic permit to construct, or take a water tap from Edgefield County Water and Sewer. Step two is the building permit, and the folder needs the septic permit to construct or the ECW&S water tap receipt, a digital copy of the plans uploaded to the county's portal, the completed online application, a copy of the contractor's South Carolina state licence — not required if the homeowner is doing the work, though subcontractors must still be licensed — and the fee, determined after application and plan review. A 911 address is issued once the permit is submitted and "MUST be posted visibly from the nearest public road at the beginning of every project; failure to do so could result in a failed inspection." An owner building their own home signs an Owner Builder Disclosure Statement, notarised and recorded at the time the permit is collected, stating that the owner is responsible for the work "and will not rent, lease, or sell the building for a period of two years." Eight inspections follow: temporary power; footing or slab, where "Rebar must make turns around corners in footings"; foundation; floor joist, before any wall and before any decking; rough-in, with Manual J calculations submitted and a leak test on plumbing; insulation; final electrical, at which the completed septic approval and evidence of termite control must be submitted before the county authorises power; and the certificate of occupancy. To close it out the department wants the IECC air barrier and insulation criteria, the termite letter, the duct tightness test, the Manual J, the final septic and the disclosure statement where one applies. Two general notes from the same booklet land squarely on this building type: "Two rows of #4 rebar in footings are the minimum," and "Use type 'S' mortar mix on bearing foundation and piers. If you are using a pier foundation you need to discuss this with the Building Department."
Fifth-fastest growth in the state, and four fifths of it went to open country: Edgefield County went from a 2020 census base of 25,657 to 29,808 on 1 July 2025 — a gain of 4,151 and 16.2 percent, the fifth-fastest of South Carolina's forty-six counties on the Census Bureau's own estimates. What makes it a land story rather than a suburb story is where those people landed. Over the same period the Bureau's place estimates put the town of Edgefield up 273 to 4,182, Johnston up 234 to 2,233, Trenton up 216 to 412, and the Edgefield County portion of North Augusta up 46 to 305. That is 769 people between all four municipal footprints, against 4,151 for the county — so on these figures better than four in five of the people Edgefield added since 2020 are living outside any town limit. Annexation moves people between those two columns, so the split is an estimate rather than a headcount; but the direction is unambiguous and it is the opposite of what happens in most fast-growing South Carolina counties, where the municipal share does the growing. The land base underneath it: USDA's 2022 Census of Agriculture records 410 farms working 68,671 acres in Edgefield County — 21.4 percent of a 320,440-acre county — at a 167-acre average, split into 22,693 acres of cropland, 9,423 of pasture, 32,065 of woodland and 4,490 of other use, with 7,378 acres irrigated. Those four use figures sum exactly to the total, which is how they were checked. The size distribution is what a buyer needs: 43 farms of 1 to 9 acres, 127 of 10 to 49, 136 of 50 to 179, 77 of 180 to 499, 16 of 500 to 999 and 11 above 1,000 acres — so 65 percent of the county's farms are under 180 acres. Between 2017 and 2022 the number of farms rose 3 percent while land in farms fell 13 percent and the average holding fell 15 percent: more operations on less ground, which is the pattern that puts mid-size tracts on the market.
This county sells more fruit than any other in South Carolina: Edgefield's agricultural economy is not the one the acreage figures suggest, and the difference matters to anyone pricing land here. The 2022 Census of Agriculture puts total market value of products sold at $105,511,000 — fifteenth among the state's forty-six counties, on the twelfth-smallest farm acreage base — with crops at $75,148,000 and livestock, poultry and products at $30,364,000, a 71/29 split. Inside the crop half, one line dominates: fruits, tree nuts and berries at $51,377,000, ranked first in South Carolina and 78th among the 2,711 counties nationally that report the item. This is peach country, and the orchards around Johnston and Trenton are why. Poultry and eggs account for $26,748,000 of the livestock side. Per farm the numbers are large for a county of this size — market value of products sold averaging $257,344, total farm production expenses $212,467, net cash farm income $65,318 — and every one of those rose sharply since 2017. Two consequences for a build. First, an orchard neighbour is an active agricultural operation with spraying, frost fans, harvest traffic and night work, and the RA district exists precisely to "prevent or minimize conflicts between common farm practices and nonfarm uses." Second, an irrigated orchard tract is worth more as an orchard than as a house site, which is why the buyable inventory here skews to the 10-to-179-acre band of woodland and pasture rather than to the irrigated ground: 7,378 acres are irrigated, 11 percent of land in farms.
The Fall Line changes how the septic evaluation is done, and the clay here moves: Edgefield sits across the boundary between the Piedmont and the Coastal Plain, and South Carolina's onsite wastewater regulation changes method across that line: R.61-56 § 104.1(5) provides that "Backhoe pits shall be required above the Fall Line that separates the Piedmont area from the Coastal Plain as defined by the South Carolina Geological Survey." Below it the evaluation is done from borings. On the Piedmont side the soils bring their own problem, and it is the one South Carolina condition that genuinely changes how a slab is designed. Edgefield is in the mafic belt, and a query of the USDA soil survey returns 5,507 acres of Winnsboro and 4,288 acres of Helena in this county — both series carrying a maximum linear extensibility of 7.5 percent, which is a high shrink-swell rating. Ground like that heaves and settles with the seasons and drains very slowly. For a barndominium the exposure is worse than for a conventional house, because the building is typically one wide rigid slab, and a wide rigid slab across a mapped soil-unit boundary is the case that cracks. The practical sequence, in order: pull the Web Soil Survey report for the parcel first and look for Winnsboro, Helena, Iredell, Enon or any unit reporting linear extensibility at or above 6 percent; get a licensed Professional Soil Classifier onto the ground for the septic determination before closing rather than after, because their answer can be no; and where those units show up, get Atterberg limits and an expansion index before the foundation is designed. The county's own Building Official Manual asks the foundation plan to "Provide geotechnical criteria and assumptions used for foundation design," which is the place that work lands. Section 61-56.200.7 then requires a usable repair area of at least 50 percent of the original system on soil proven suitable, so the parcel must carry the system, its full setback envelope and a proven reserve — none of it under the drive, the shop or a pool.
Flood rules apply countywide, zoned or not — and the shop has a $3,000 threshold: Section 24-5(a)(1) puts the Flood Hazard District regulations at § 24-33 on the countywide list, so they reach unzoned Edgefield ground exactly as they reach zoned ground. Four provisions matter on this building type. First, the burden before the permit: "Before a building permit is issued, the applicant shall demonstrate that new structures cannot be located out of the Flood Hazard District." That is a stronger test than most flood ordinances impose — the default is to build somewhere else on the parcel, and the applicant has to show why not. Second, the elevation: new construction or substantial improvement of any residential structure "shall have the lowest floor elevated no lower than one foot above the base flood elevation," with a pre-construction and post-construction flood elevation certificate submitted and no basements permitted. Where perimeter walls create a fully enclosed area below that floor, the area must preclude permanent living space, be useable solely for parking, access or storage, and carry flood openings — at least two on different walls, a total net area of not less than one square inch per square foot of enclosed area, with the bottom of every opening no higher than one foot above grade. Third, the accessory threshold, which is low and easy to miss: "An accessory structure, the cost of which is greater than $3,000.00, must comply with the elevated structure requirements." A pole barn costs more than three thousand dollars, so a detached shop in a flood hazard area is an elevated structure. Fourth, the setback where the maps run out: on small streams where no flood data have been provided or no floodway identified, "No encroachments, including fill, new construction, substantial improvements or new development shall be permitted within 100 feet of the stream bank" unless a registered professional engineer certifies with supporting technical data that flood levels will not rise. That hundred-foot line applies on ground FEMA has never mapped, which describes a lot of rural Edgefield.
The market answers west across the river — and the code does not: Edgefield County is one of two South Carolina counties in the Augusta–Richmond County, GA-SC metropolitan statistical area, the other being Aiken next door, and the pair had a combined 2025 population of 641,231 across the whole metro. The Savannah River is the state line on this flank, and the practical consequences run one way: a buyer's job, lender, appraiser, comparable sales, television market and commute all point west and south-west, and the county's own growth pattern — fifth-fastest in South Carolina on a small base — is largely that metro spilling up the ridge past North Augusta and Trenton. There is one thing that does not travel across the river, and it is worth stating plainly because the assumption costs real money on a first submittal. S.C. Code § 6-9-10(A) requires every South Carolina municipality and county to enforce the Building Codes Council's codes and to "enforce only" those, and Regulation 8-236(C) provides that "Local jurisdictions are prohibited from writing or publishing any other building codes in part or in whole." A parcel in Edgefield County is permitted under the 2021 South Carolina codes by the Edgefield County building official, against the Council's own seismic map for this county, on the Edgefield County fee schedule, with an Edgefield County septic permit issued by SCDES under R.61-56. A plan set prepared to another state's residential amendments, or a design wind speed lifted from a chart on the other bank, is not a shortcut — it is a resubmittal. The one figure that does cross usefully is a labour and materials market: contractors, steel suppliers, truss plants and concrete plants serving the metro serve both sides of the river, which is why build costs here track the metro rather than the rural Midlands.
A barndominium is never a farm structure — and the county spells out what the affidavit does buy: S.C. Code § 6-9-65(A) defines a farm structure as one constructed on a farm "other than a residence or a structure attached to it, for use on the farm including, but not limited to, barns, sheds, and poultry houses," and expressly excludes any structure "originally qualifying as a 'farm structure' but later converted to another use." A barndominium is a residence, so it never qualifies; the shop half of a shop-house under one continuous roof is attached to a residence, so it does not either. There is no square-footage test and no percentage-of-use test to argue over, and no amount of acreage changes it. The exemption is not automatic even for a genuinely agricultural barn: § 6-9-65(C) makes the section inapplicable unless the owner files an affidavit with the official responsible for enforcing the building code before construction, stating that the structure is being built as a farm structure and setting out its purpose and intended use; § 6-9-65(B) preserves National Flood Insurance Program standards regardless — which matters here, because Edgefield's flood rules apply countywide and set the accessory threshold at $3,000; and § 6-9-65(D) leaves the county free to require a building permit anyway. What Edgefield adds is a clear statement of exactly how far the affidavit reaches, printed in its own residential booklet under the heading Farm Structure Affidavit: "Only the building receives no inspections and doesn't require an Owner Builder/Disclosure Statement, but any electrical, mechanical or plumbing work shall be completed by SC licensed contractors and must get their permits and inspections." So the affidavit buys you no structural inspection on the shell. It does not buy you unpermitted wiring, unpermitted plumbing or unpermitted mechanical work, and the moment any of those goes in, licensed contractors and inspections come with them. Building a bare shell under the affidavit and finishing it into living space later brings the full code back onto it as the dwelling it has become, and leaves no footing or framing inspection record for a lender, an insurer or a future buyer to rely on.

Below the slab

The expensive surprises are in the ground, not the building

What moves a South Carolina budget is usually below grade, and more often than not it is the drainfield rather than the foundation. R.61-56 § 200.1 settles whether a parcel can take an onsite system from soil morphology — texture, structure, depth to a restrictive horizon and depth to the zone of saturation — and § 200.2 then rules out two conditions outright: soils exhibiting massive or platy structure, and soils with substantial amounts of expansible layer clay minerals or smectites. That second clause is the one that bites on the mafic Piedmont, where the shrink-swell series sit in quantity under York, Fairfield, Chester, Laurens, Union, Newberry, Greenwood, McCormick, Lancaster, Saluda, Abbeville and Edgefield. A foundation problem has a price and an answer; an unbuildable septic parcel has neither, which is why we look at it first. Bedroom count is the number to settle early, because § 61-56.501 drives design flow from bedrooms, design flow drives trench length, and trench length plus a repair area decides how much good soil the parcel has to have — shop square footage adds nothing to it. Above the Fall Line the evaluation is done in backhoe pits rather than borings alone, so the answer comes from a dug hole and not a form. The site work, the foundation and the drainfield therefore get resolved together rather than one at a time. We price the dirt before we price the building.

What we build in Edgefield County

All nine services are available in Edgefield County. What a build costs depends far more on the parcel than on square footage, so we price against your land rather than publishing a rate card.

Custom Plans

Barndominium plans drawn for your parcel and sealed at the point where South Carolina’s engineering exemption stops applying.

Barndominium Kits

Engineered shell packages for South Carolina land — open construction under the state’s own definition, and therefore not a modular building.

Turnkey Builds

Barndominium construction from raw land through to occupancy: one contract, one schedule, one party answering the building official.

See all nine services

What a build looks like

Three stages every Edgefield County project passes through, from a raw parcel to a finished home. Site work first, because that is where the budget is decided.

Stage one

The parcel

Zoning, setbacks, flood zone and utility access get checked before anything is drawn.

Stage two

Pad and permit

Clearing, grading and a compacted pad, while the submittal works through whichever office issues the permit where you are building.

Stage three

Frame to finish

Shell erected and dried in, then systems, insulation and interior finish through to CO.

Those are the rules where you are building in Edgefield County. Tell us what you want to build and we will draw it to them.

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Keep reading

The questions that usually come next once you know what Edgefield County allows.

Barndominium Cost Guide

Sourced per-square-foot ranges by tier and by size, with a calculator built on the same figures.

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How Long Does It Take?

Census build-duration data, and what actually sets the permit clock where you are building.

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Nearby areas we build in

Others we cover nearby. One may be a county and another a municipality inside one — and a South Carolina municipality can sit in two counties at once — so the office that issues the permit, the fees it charges, whether the land is zoned at all, and which design map covers it can all differ from one card to the next.

Aiken County

Building in Edgefield County: common questions

8 questions we get asked most often about building in Edgefield County. If yours is not on the list, ask it directly.

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What design wind speed applies in Edgefield County?

There is no published figure, and that is a real answer rather than a gap in the research. Regulations 8-1202 and 8-1203 replace the residential code's own wind and seismic sections with the maps the South Carolina Building Codes Council publishes for 35 of the 46 counties, and Edgefield is one of the 35 — so this is not one of the eleven counties the Council never mapped. But its sheet publishes a seismic boundary and nothing else. Taken apart on 8 September 2026, Edgefield 15.pdf holds three text annotations — the Council's standard note and two matched pairs reading "Seismic Design B" and "Seismic Design C" at either end of a drawn boundary — and eighteen drawn lines, every one of them red. There are no embedded images in the file, so nothing is hidden in a scan, and the string "MPH" does not appear anywhere in it in any case. The Council's note is explicitly about a different colour: wind speed "applies at all points along the length of its corresponding (blue) line." There is no blue line on Edgefield's sheet. Next door, Aiken's sheet carries a blue contour labelled 115 MPH twice and Barnwell's a blue contour labelled 120 MPH twice, which is what a wind label looks like when the Council draws one. What governs instead is modification IRC 2021-04, under which the local building official may "delineate the wind design category" within the jurisdiction so long as it does not surpass the figures on the Applied Technology Council's site, with a floor at the lowest wind speed in the code's prescriptive provisions. So the wind number for your parcel is a determination the Edgefield County building official makes. Ask for it in writing, for your tax map number, before a truss or steel package is ordered — and note that the county's own Building Official Manual asks a plan cover sheet for the seismic zone and does not ask for a wind speed.

Is my land zoned? How do I find out, and what changes if it is not?

It might not be, and in Edgefield that is a genuine question rather than a formality. The county's ordinance is titled in its own preamble the "Land Development Ordinance with Zoning Regulations for Portions of Edgefield County," and § 24-3 records that zoning regulations "have been added for certain areas of the county, as delineated and shown on accompanying zoning maps," with "Areas not included in a zoning district … referred to as unzoned areas." What changes across that line is substantial. In a zoned area the whole chapter applies: minimum lot area, lot width, front, side and rear setbacks from Table 2 at § 24-32, the accessory-structure placement rules in Table 4, the height provisions, and the use schedule at § 24-31. In an unzoned area, § 24-5(a) applies a listed set of countywide sections — flood hazard, airport compatibility, manufactured housing and manufactured home parks, communication towers, landfills, signs, solar, mines and quarries, sewerage treatment, the land development regulations at §§ 24-164 through 24-181 and the administrative sections — and § 24-5(b) adds minimum side and rear setbacks for commercial and industrial uses only, ranging from 50 feet for general business to 500 feet for outdoor amusements, airports and special industry or mining. A single-family dwelling and its outbuildings on unzoned ground therefore take no minimum lot size, no side or rear yard and no height limit from this chapter. What does not change is the building code: S.C. Code § 6-9-10(A) requires the county to enforce the Building Codes Council's codes everywhere in the unincorporated area, and § 6-9-30(A) puts unincorporated land under a building official by name. The way to settle it is cheap — a zoning verification letter from Building and Planning is $10.00 on the published fee schedule. Get one before you make an offer, not after, because the answer changes what you can put on the parcel and what a lender will read on the appraisal.

Can the shop be bigger than the house, and how tall can it be?

Bigger, yes — Edgefield's ordinance sets no square-footage cap on an accessory building anywhere in it, which is at the permissive end for South Carolina. What it sets is placement and height. Section 24-203(5) requires accessory uses and structures to observe the setbacks applicable to the principal building, and then modifies them in Table 4; the row headed "Auxiliary shed, workshop, storage building" gives the front, side and corner-lot setbacks as BL — "required building line for principal use" — and the rear setback as three feet. So the shop lines up with the house at the front and sides but may come within three feet of the back property line, which on a deep rectangular tract is a real allowance. Height is where it gets interesting. Section 24-206(b) provides: "If located within the buildable area, accessory buildings shall observe the height limits for the district within which they are located. If located in a required setback area, the buildings shall not exceed 12 feet in height." And the district height limit in Table 2 is note (D): "No limits; however, buildings in excess of 40 feet in height shall observe an additional setback from side and rear property lines of one foot for each one foot in height over 40 feet." Put those together and a tall clear-span bay with a 16-foot door is straightforward as long as it sits inside the buildable area — height is converted into a setback question rather than blocked by a ceiling. Push it into a required setback and it drops to twelve feet, which will not take a shop door. Two more rules: no manufactured home may be used as an accessory building anywhere in the county, and where more than one main building stands on a lot, § 24-203(4) requires them to be separated by at least the height of the tallest adjacent building. And if the shop bay and the living space are one continuous building, none of this applies at all — that is the dwelling, not an accessory structure.

I want to run my business out of the shop. Can I?

On ten acres in the RD Zone, yes, and further than almost anywhere else on this axis. Section 24-208, the county's "Ten acre rule," provides that land parcels and tracts ten acres or larger in the RD Zone "may include the following uses, irrespective of the use requirements of table 1, section 24-31 and regulations otherwise applicable to such uses," and then names: "Home occupations, without limitation to the number of employees, number of buildings or structures, amount and/or size of equipment and parking, and number of trucks in support of such home occupation." Employees, buildings, equipment, parking and trucks — those five are the limits that a normal home-occupation clause imposes, and this ordinance lifts all five at ten acres. The one thing withheld is retail display: "vehicles, equipment and goods produced off site shall not be displayed for sale, lease or transfer." The same section allows residentially designed manufactured homes on those tracts at no more than one per five acres, kept 100 feet from the nearest property line, and outside the manufactured home park regulations — a family-land answer for a parcel that would otherwise trip the park rules. The RD district's own purpose statement at § 24-29(c)(1) confirms the intent: the district "is also designed to allow greater use flexibility for large tracts, ten acres or more in size, as provided for in section 24-208, ten-acre rule." Two cautions before a business plan leans on it. First, it is written for the RD Zone specifically, so confirm the district on the tax map number — a zoning verification letter is $10.00. Second, a commercial use in an unzoned area of the county is a different question and picks up the § 24-5(b) setback table, where general business takes 50 feet from side and rear property lines and light industry 300 feet. Take the actual use to the department in writing before committing.

How much will the county charge me in permit fees?

The schedule is valuation-based and one line on it works clearly in a house's favour. Building by evaluation, which includes roofing, is $20.00 for the first $1,000 plus $6.00 for each additional thousand up to $50,000; $314.00 for the first $50,000 plus $5.00 per thousand to $100,000; $564.00 for the first $100,000 plus $4.00 per thousand to $500,000; and $2,164.00 for the first $500,000 plus $3.00 per thousand above that. The favourable line is the next one: "Plan Review fees (Commercial Projects Only) — Half of applicable building permit fees." Plan review is charged on commercial work only, so a residential build carries none, which is not the case in several neighbouring counties. Trade permits are charged separately and are modest: mechanical is $25.00 issuance plus $10.00 for the first $1,000 and $2.00 per additional thousand on new work; plumbing is $20.00 issuance plus $2.50 per fixture, with $10.00 for a septic tank connection and $5.00 for a new sewer connection; electrical is banded by service size from $25.00 at 30 to 100 amps up to $600.00 above 2,000 amps, plus $0.50 per circuit breaker and $25.00 for a temporary power pole. Administration is $10.00. On the planning side a zoning verification letter is $10.00, a variance or an appeal is $100.00, a minor subdivision is $10.00, a major subdivision is $200.00 plus $10.00 per lot, a final plat is $100.00, and a land development permit is $100.00 up to ten acres, $200.00 up to fifty and $300.00 above fifty. Re-inspections run $40.00, then $80.00, then $120.00. No impact fee appears on the published schedule. Two practical notes from the county's residential booklet: the fee is "determined after application & plan review," so it is not quoted at the counter, and if you pull a permit and later abandon the project the county will not refund it.

What should I know about the soil before I buy?

Two things, and they belong before the offer rather than after. The first is that this county sits astride the Fall Line, and South Carolina's onsite wastewater regulation changes method across it: R.61-56 § 104.1(5) requires backhoe pits above the Fall Line separating the Piedmont from the Coastal Plain as defined by the South Carolina Geological Survey, while borings are used below it. So the evaluation itself looks different depending on which side of the county your tract is on. The second is shrink-swell, and it is the one South Carolina soil condition that genuinely changes how a slab is designed. Edgefield is in the Piedmont's mafic belt, and a query of the USDA soil survey returns 5,507 acres of Winnsboro and 4,288 acres of Helena in this county, both carrying a maximum linear extensibility of 7.5 percent — a high shrink-swell rating. That ground heaves and settles seasonally and drains very slowly, and the exposure is worse for this building type than for a conventional house because a barndominium is usually one wide rigid slab. The single most dangerous case is a wide slab spanning a mapped soil-unit boundary, and almost nobody warns about it. The sequence that works: pull the Web Soil Survey report for the parcel and look for Winnsboro, Helena, Iredell or Enon, or any unit reporting linear extensibility at or above 6 percent; get a licensed Professional Soil Classifier onto the ground for the septic determination before closing, because their answer can be no and § 61-56.200.7 also requires a proven repair area of at least 50 percent of the original system on suitable soil; and where those units appear, get Atterberg limits and an expansion index before the foundation is designed. The county's Building Official Manual is the place that work lands — its foundation-plan standard asks you to "Provide geotechnical criteria and assumptions used for foundation design."

We are moving over from the metro side of the river. Does anything change?

The market does not; the rulebook does. Edgefield County is one of two South Carolina counties in the Augusta–Richmond County, GA-SC metropolitan statistical area — Aiken is the other — and the Savannah River is the state line between them. Practically, a buyer's job, lender, appraiser, comparable sales and television market all point west, and the county's growth confirms it: 25,657 people at the 2020 census base, 29,808 by July 2025, a 16.2 percent gain that is the fifth-fastest in South Carolina. Contractors, steel suppliers, truss plants and concrete plants serve both banks, which is why build costs here track the metro rather than the rural Midlands. What does not cross the river is the code. S.C. Code § 6-9-10(A) requires every South Carolina county and municipality to enforce the Building Codes Council's codes and to "enforce only" those, and Regulation 8-236(C) provides that "Local jurisdictions are prohibited from writing or publishing any other building codes in part or in whole." So a parcel here is permitted by the Edgefield County building official under the 2021 South Carolina codes, against this county's own Council seismic sheet, on the Edgefield County fee schedule, with a septic permit issued by the South Carolina Department of Environmental Services under R.61-56. A plan set prepared to another state's residential amendments, or a design wind speed lifted from a chart on the other bank, is a resubmittal rather than a shortcut. One thing that will feel different: on the South Carolina side the county's own growth has gone overwhelmingly to open country rather than to the towns — on the Census Bureau's place estimates, the town of Edgefield, Johnston, Trenton and the Edgefield portion of North Augusta together account for about 769 of the county's 4,151 additional residents since 2020. The land is where the growth is.

Is my property in a flood zone, and what does that do to the shop?

Section 24-5(a)(1) puts the flood rules on the countywide list, so § 24-33 reaches unzoned Edgefield ground exactly as it reaches zoned ground, and four provisions bear on this building type. First, before anything else, the county asks you to prove you have to be there: "Before a building permit is issued, the applicant shall demonstrate that new structures cannot be located out of the Flood Hazard District." On a large tract that is often answerable simply by moving the pad, and doing so is usually cheaper than engineering around the alternative. Second, the elevation: a new residential structure "shall have the lowest floor elevated no lower than one foot above the base flood elevation," with a pre-construction and a post-construction flood elevation certificate and no basements. Where perimeter walls create an enclosed area below that floor it must preclude permanent living space, be used solely for parking, access or storage, and carry at least two flood openings on different walls totalling not less than one square inch per square foot of enclosed area, with the bottom of every opening no higher than one foot above grade. Third, and this is the one people miss: "An accessory structure, the cost of which is greater than $3,000.00, must comply with the elevated structure requirements." Three thousand dollars is a very low bar for a shop, so a detached building in a flood hazard area here is an elevated structure, not an exempt one. Fourth, the rule where the maps stop: on small streams with no flood data and no identified floodway, no fill, new construction, substantial improvement or new development is permitted within 100 feet of the stream bank unless a registered professional engineer certifies with supporting technical data that flood levels will not rise. That hundred-foot line applies on ground FEMA has never mapped, which covers a lot of rural Edgefield, and it is worth walking the parcel for small drainages before the pad location is fixed.

Building in Edgefield County?

Start with the plan. Tell us what you want to build and we will draw it, then confirm which office issues the permit for your parcel, what it will let you put there, and what wind load it has to meet. That conversation costs nothing.

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