Lexington County One statewide code, county design maps

Barndominium Builders in Lexington County, SC

Lexington County went from a 2020 estimates base of 293,919 to 317,588 people on 1 July 2025, and unlike most of the Midlands it still has land to put them on: 79,450 acres in farms across 822 operations, at an average of only 97 acres. That average is the story. Four hundred and seventy-six of those 822 farms are under fifty acres. This is not consolidated plantation ground being held in one piece - it is a county already subdividing into the ten- and twenty-acre parcels a barndominium actually gets built on, from Gilbert and Pelion and Swansea out through Batesburg-Leesville. Two things about building here are unlike the neighbouring county. The zoning ordinance regulates activities rather than buildings, so it sets no maximum square footage for a detached shop and no flat height cap - height comes off a control slope measured back from the property line, and a detached dwelling that keeps five feet of clearance is exempt from it outright. And the county prices its zoning and landscape permits by the acre rather than by the building. One warning about geography: the City of Columbia's limits reach into this county, and the Town of Lexington is its own permitting authority inside its own line, so the mailing address on a listing settles nothing.

Lexington County at a glance

County: Lexington County
Population: 317,588

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Building conditions in Lexington 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 Lexington 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 Lexington County map reads 115 MPH, with no seismic category in its text

South Carolina takes the ultimate design wind speed out of the IRC's national map and hands it to the Building Codes Council's own per-county sheets: Reg 8-1202 replaces IRC R301.2.1 with "the previously published maps by the South Carolina Building Codes Council," and Reg 8-1203 does the same for the seismic design category at R301.2.2.1. Lexington is one of the 35 counties of 46 that have a sheet. Its map, Lexington 15.pdf, carries 115 MPH wind contour labels and prints this note on its face: "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(4A) of the 2015 International Residential Code." So even here the figure is read off the map at the parcel and the building official interpolates between lines. The map's machine-readable text layer carries no seismic design category label at all, so no seismic category is stated for Lexington County on this page - ask the county building official to read it off the Council sheet for your tax map number and put the answer in writing. For context, the residential code's seismic provisions do not reach a detached one- or two-family dwelling until category D0, and South Carolina's D2 ground is in the Lowcountry, not the Midlands.

SC Building Codes Council, Wind/Seismic Maps, https://llr.sc.gov/bcc/maps.aspx, and the Council's Lexington County sheet Lexington 15.pdf, https://llr.sc.gov/bcc/PDFfiles/WSMaps/Lexington%2015.pdf (application/pdf, 8,082,301 bytes, downloaded 6 Sep 2026; text layer extracted and read). SCBCC 2021 Modification Index, modifications IRC 2021-04 and IRC 2021-05, https://llr.sc.gov/bcc/PDFfiles/2021-Modification-index.pdf

There is no square-footage cap on a detached shop in this county's zoning ordinance

This is the single most useful difference between Lexington County and the county next door. The Lexington County Zoning Ordinance regulates land use activities, not building sizes. Section 21.20 provides that each principal activity "shall be deemed to include activities customarily associated with and appropriate, incidental, and subordinate to the principal activity when located on the same lot," and that such accessory activities "shall be controlled in the same manner as its associated principal activity except as otherwise provided in this Ordinance." Section 12.10 defines "Accessory" as an activity or structure "customarily associated with and appropriately incidental and subordinate to a principal activity and/or structure." What the ordinance then imposes on a residential accessory building is one dimension and one only: Section 23.30 provides that "accessory buildings to residential activities must maintain a minimum 5-foot setback from adjoining property lines." There is no percentage-of-the-dwelling ceiling, no fixed maximum floor area, and no separate accessory height table of the kind several other South Carolina counties impose. Two cautions before you plan around that. "Subordinate" is a word the Zoning Administrator interprets, and Section 12.10 gives that office the express power to "define any word or interpret any definition." And a shop bay under the same continuous roof as the living space is not an accessory structure at all - it is part of the dwelling, which is the cleanest way to build one here.

Lexington County Zoning Ordinance, 24 June 2025 edition, Sections 12.10 (Definitions), 21.20 (Accessory Activities) and 23.30 (Setbacks), county-published PDF at https://www.lex-co.sc.gov/sites/lexco/files/Documents/Lexington%20County/Departments/Zoning/Zoning%20Ordinance/Zoning%20Ordinance%206.24.25.pdf (application/pdf, 2,550,111 bytes, downloaded and read as extracted text 6 Sep 2026)

Height is a slope measured back from your property line, not a number

Almost every county in this state caps building height at a flat figure. Lexington County does not. Section 23.10 of the Zoning Ordinance provides that "height regulations are based on the establishment of a height control slope. Initially, a 20-foot rise is permitted at the property line perpendicular to the property line. Then, based on the district concerned, and the activity involved, a height control slope is specified in terms of a ratio of vertical rise to horizontal distance." The ordinance publishes the resulting table. On the 1:1 slope that the Section 23.60 chart assigns to Residential Detached in a Restrictive Development District, a structure may reach 25 feet at 5 feet from the line, 40 feet at 20 feet, 70 feet at 50 feet and 120 feet at 100 feet. Then comes the sentence that matters most to a house: "The International Residential Code for One- and Two-family Dwellings allows no more than three stories above-grade in height; therefore, any Residential Detached or Residential Attached (2 dwelling units) activity that meets a 5-foot setback from adjoining property is exempt from the height requirements of this section." A tall gable, a clear-span shop with a 16-foot door, a loft over the living end - none of them run into a county height ceiling here so long as the setback is kept and the building stays within the residential code's three storeys above grade plane.

Lexington County Zoning Ordinance, 24 June 2025 edition, Section 23.10 (Height Regulations) and the Section 23.60 Chart of Maximum Buffering Restrictions, Residential Detached row, https://www.lex-co.sc.gov/sites/lexco/files/Documents/Lexington%20County/Departments/Zoning/Zoning%20Ordinance/Zoning%20Ordinance%206.24.25.pdf (read 6 Sep 2026)

Countywide zoning, but a Columbia or Lexington address does not mean the county permits

Section 11.20 of the Zoning Ordinance says the regulations "shall apply to all land and improvements thereon as described on the Zoning Maps for Lexington County, South Carolina," and Section 12.00(g) settles what that means: "the word 'County' or 'Lexington County' shall mean the area of jurisdiction of Lexington County, South Carolina, excluding all incorporated municipalities." There is no unzoned remainder and no petition mechanism for extending zoning - the unincorporated county is mapped, and the incorporated places are outside it. That matters more here than in most counties for two reasons. Part of the City of Columbia lies inside Lexington County, so a Columbia postmark can mean Richland County, Lexington County, Kershaw County, or the city itself. And the Town of Lexington is a separate jurisdiction with its own offices from the county that shares its name - the county's are at 212 South Lake Drive in Lexington, and the town's are elsewhere in the same town. Cayce, West Columbia, Irmo, Springdale, Pine Ridge, South Congaree, Gaston, Swansea, Gilbert, Pelion, Chapin, Batesburg-Leesville and Summit all run their own limits as well. Confirm the jurisdiction against the tax map number before you put money on a parcel.

Lexington County Zoning Ordinance, 24 June 2025 edition, Sections 11.20 (Jurisdiction), 12.00(g) and 11.50 (Incorporation of Maps), https://www.lex-co.sc.gov/sites/lexco/files/Documents/Lexington%20County/Departments/Zoning/Zoning%20Ordinance/Zoning%20Ordinance%206.24.25.pdf; County of Lexington, Community Development department page (Development Services Division and Building Inspections and Safety Division; Land Development Division), https://lex-co.sc.gov/departments/community-development; county address from the Municode client record for Lexington County, South Carolina (client 6600, 212 South Lake Drive, Lexington SC 29072), verified against the county's own site 6 Sep 2026

The zoning permit is priced by the acre, and the building permit by valuation band

Lexington County Council sets the permit schedule - County Code Sec. 14-332 says fees are paid "in accordance with the schedule established by Lexington County Council" - and the schedule in force from 1 July 2025 prices two of the permits a rural build needs by land area rather than by building. A residential zoning permit, and one accessory to residential, is "$75.00 per acre (or portion)"; a residential landscape permit is the same. On a ten-acre homesite that is a materially different number from what the same permit costs on a half-acre lot, and it is worth knowing before you buy more land than you intend to build on. The building permit itself runs on valuation: a $50 minimum, $50 flat to $4,000, then $50 plus $5 per thousand to $100,000, $450 plus $5 per thousand to $250,000, $1,185 plus $3 per thousand to $500,000, and $1,700 plus $2 per thousand above that. The schedule also publishes a $115.00 residential plan or permit revision fee, a $45.00 compliance inspection, a $60.00 charge for each re-inspection after the first and the same $60.00 where the inspector arrives and the work is not ready, a $262.00 stop work order release, and a $50.00 temporary power for occupancy permit. County Code Sec. 14-337 adds a further Council-set fee on top of the permit fee where work started before the permit issued.

County of Lexington, "DEVELOPMENT REVIEW and PERMIT FEES - EFFECTIVE 7/1/2025", https://lex-co.sc.gov/sites/lexco/files/Documents/Lexington%20County/Departments/Community%20Dev/DEVELOPMENT%20REVIEW%20and%20PERMIT%20FEES%20-%202025-26.pdf (application/pdf, 124,797 bytes, read as extracted text 6 Sep 2026); Lexington County Code of Ordinances Secs. 14-331, 14-332, 14-333 and 14-337 (Ord. No. 20-01, Art. 8, 28 July 2020), https://library.municode.com/sc/lexington_county/codes/code_of_ordinances — read via api.municode.com client 6600, product 11162, job 480068 (Supp. No. 20, codified through Ord. No. 25-04, enacted 24 June 2025)

126,469 acres of Lakeland sand - more than any other county in the State

The Sandhills run across the north of this county and the Inner Coastal Plain across the south, and the soil that dominates is Lakeland: a deep, excessively drained sand. Soil Data Access acreage puts 126,469 acres of Lakeland in Lexington County, the largest figure for any county in South Carolina, ahead of the Aiken County Area at 90,638 and the Kershaw County Area at 82,459, with a further 25,587 acres of Fuquay here. Deep sand cuts both ways on a barndominium site and the two failures are opposites. Sand can be too permeable to treat effluent properly, which is a septic design problem rather than a drainage one. And Sandhills soils frequently carry a fragipan or plinthite layer at shallow depth - South Carolina Regulation 61-56 § 200.5 disqualifies a site where a restrictive horizon sits within twelve inches of the trench bottom, and the drainfield is sized off the most hydraulically limiting layer, which can swing the required field size by a factor you cannot see from the surface. Sand also gives cohesionless trench walls, weak lateral resistance for an embedded post, and severe erosion on a freshly graded pad. A soil evaluation belongs before the purchase closes, not after the pad is poured.

USDA-NRCS Soil Data Access component acreage by county, compiled in research/statewide/soils-and-geology.md (Lakeland: Lexington 126,469 ac; Aiken County Area 90,638; Kershaw County Area 82,459; Fuquay: Lexington 25,587) — series descriptions at https://soilseries.sc.egov.usda.gov/OSD_Docs/L/LAKELAND.html and https://soilseries.sc.egov.usda.gov/OSD_Docs/F/FUQUAY.html; S.C. Regulation 61-56, Onsite Wastewater Systems, §§ 200.5 and 200.7, SCDES copy at https://des.sc.gov/sites/des/files/Library/Regulations/R.61-56.pdf

Also worth knowing before you build in Lexington County

The county's building code adoption follows the State automatically, chapter 1 and all: Most South Carolina counties name an edition in their ordinance. Lexington County deliberately does not. County Code Sec. 14-172 adopts "the provisions of the International Building Codes (including chapter 1), including state adopted appendices, in the version most recently adopted by the State of South Carolina Department of Labor, Licensing, and Regulation (SCLLR)," with the exception that detached one- and two-family dwellings, townhouses of not more than three storeys "and their accessory structures shall comply with the International Residential Code (including chapter 1) in the version most recently adopted" by the same body. Read that exception carefully: it puts the shop under the residential code alongside the house. The same section adds that appendix provisions "shall not apply unless specifically adopted through this article or through the state adoption process," and that where the codes are updated the previous version stays in force for pending rights and actions. Taking chapter 1 matters because S.C. Code § 6-9-50(A) withholds the administration chapters from the statewide adoption unless a local governing body takes them, so the construction standard here is the State's and identical in all 46 counties, while the paperwork it runs on is Lexington County's own.
180 days to start and 90 days to stall - a tighter clock than the neighbours keep: Owner-paced builds are common on rural acreage and this is the provision that catches them. County Code Sec. 14-265 reads: "Every permit issued shall become invalid unless the work on the site authorized by such permit is commenced within 180 days after its issuance, or if the work authorized on the site by such permit is suspended or abandoned for a period of 90 days after the time the work is commenced. The building official is authorized to grant, in writing, one or more extensions of time, for periods not more than 90 days each. The extension shall be requested in writing and justifiable cause demonstrated." Ninety days of no work is a short window when a shell is waiting on a steel delivery or on the money for the interior. The extensions are real and repeatable but they are discretionary, they are in writing, and they need a stated cause. Sec. 14-267 also requires the permit card kept in a conspicuous place on the front of the premises, weather-protected, from before work starts until the certificate of occupancy issues, and Sec. 14-266 lets the building official revoke a permit issued on incorrect or incomplete information.
The county asks for the braced wall lines on the drawings: County Code Sec. 14-291 requires construction documents in two or more sets with each permit application, "prepared by a registered design professional where required by state and local statute," and lets the building official require more where special conditions exist. Sub-item (3) is the one that lands on this building type: "Information on braced wall design. For buildings and structures utilizing braced wall design, and where required by the building official, braced wall lines shall be identified on the construction documents. Pertinent information, including, but not limited to, bracing methods, location, and length of braced wall panels and foundation requirements of braced wall panels at top and bottom shall be provided." A barndominium is mostly large openings in long walls, which is exactly where prescriptive bracing runs short, so this is a submittal item to have answered by the designer rather than discovered at plan review. Sub-item (4) separately requires a site plan showing the size and location of the new construction, existing structures, and distances to the property lines - the drawing that proves the five-foot accessory setback and the height control slope at the same time.
Two dwellings to the acre in the agricultural district, and a 9,000 sq ft floor on any new lot: Section 22.30 of the Zoning Ordinance sets a countywide ceiling first: "All Residential Detached, excluding Limited, and Mobile Home, and Tiny Home land use activities shall have a maximum residential density of four (4) dwelling units per exact acre, unless the zoning district or street classification density allowance is more restrictive." The district table then cuts that to 2 dwelling units per exact acre in R1, D and RA - RA being Recreational/Agricultural, the district that carries the county's rural acreage - against 3 in R2 and 4 in R3. A second table does the same job by street classification, from 4 on an arterial down to 1 on a Residential Local One, and the ordinance applies whichever of the two is more restrictive. Section 22.40 then puts a hard floor under any newly created parcel: 9,000 square feet for Residential Detached, a mobile home or a tiny home. Section 23.60's Residential Detached row sets a 10-foot setback from adjoining property and a 20-foot right-of-way setback, with a footnote raising the right-of-way setback to 30 feet for attached garages, carports and other covered parking - and requiring the whole structure to sit 30 feet back where the residence has no attached garage or carport. Section 22.30 also warns that nothing in it circumvents the state health regulations' own lot-area requirements for individual wells and septic tanks.
Build next to a working farm and the ordinance imposes a 75-foot buffer: This one catches people buying exactly the kind of parcel this county is subdividing. Section 23.62, special rule 7 of the Zoning Ordinance: "There shall be a minimum buffer width of 75 feet, unless greater as required under Section 23.60 of this Ordinance, for all new or expanding developments that adjoin existing Agricultural Operations, which have been in continuous operation for a period of seven (7) years prior to development. Existing Agricultural Operations which have discontinued active operation within this seven (7) year timeframe will not be afforded this extra protection." The exemptions listed are for land uses that are themselves actively engaged as an agricultural operation. Seventy-five feet off a boundary is real land on a narrow tract, and it is measured against a neighbour's history of use rather than against anything visible on a plat, so it is a question for the Zoning Administrator before the site plan is drawn. The same chapter also gives a 50 percent reduction in buffer and setback requirements to activities that provide total screening using existing natural vegetation, or provide it with vegetation when it is not required - which on a wooded Sandhills tract is a reason not to clear more than you need.
The State's landslide-screening threshold was calibrated on a Lexington County slope: The South Carolina Geological Survey's General Geologic Map Series 5, Geologic Hazards of the South Carolina Coastal Plain, delineates areas of potential landsliding from a slope-stability model, and it explains where its threshold came from: "Areas with landslide potential were recognized using a known landslide occurrence in Lexington County as the type example (Howard, 2010). The landslide occurred on a 12 percent slope surface. Using this information, it was determined that a slope surface of 10 percent or greater was appropriate for representing areas sensitive to potential landslide hazard." It names two settings: "oversteepened banks of major rivers, such as the bluffs of the Congaree and Wateree Rivers, and some of their minor stream tributaries," and "areas adjacent to Fall zone, which is that area of the Coastal Plain immediately southeast of the Piedmont and exhibits high relief particularly in incised stream valleys." Lexington County has both. Read the map's own limits before quoting it anywhere: the Survey states the information "should not be used for land-use zoning, building-code requirements, or defining insurance rate zones," that its zones "are not intended to replace site-specific evaluations," and that hazard potential "should be evaluated through site-specific geotechnical investigation by qualified practitioners." It screens a bluff-edge parcel. It does not decide one.
822 farms, 79,450 acres, and a 97-acre average that is falling: USDA's 2022 Census of Agriculture counts 822 farms in Lexington County on 79,450 acres - 17.8 percent of the county's 447,071 acres - at an average of 97 acres. All three measures moved since 2017, and they moved the same way: the number of farms fell 28 percent, land in farms fell 23 percent, and the average holding edged up only 7 percent. That is farmland leaving agriculture rather than being split within it — which is what a county that added more than 23,000 people looks like in the agricultural statistics, and it is the reason buy-and-build demand here is live rather than theoretical. The size distribution says the same thing: 102 farms are 1 to 9 acres and 374 are 10 to 49 acres, so 476 of the 822 operations - 58 percent - are under fifty acres. Land use inside those farms runs 37,161 acres cropland, 26,279 woodland, 8,429 pastureland and 7,581 other, with 11,500 acres irrigated. Fifty percent of the operations sell less than $2,500 of product a year, which is the statistical signature of small rural holdings rather than commercial agriculture - and of the parcels most likely to come to market whole.
Three approvals have to exist before the building permit does: Lexington County's building code ordinance stacks the sequence explicitly rather than leaving it to be discovered. Sec. 14-271: anyone intending to construct or alter a building for which a building permit is required "shall first provide a valid zoning permit, landscape permit, and/or land disturbance permit, as applicable, from the delegated authority of the jurisdiction where the construction or alteration is to be located." Sec. 14-272 lets the building official require "a certificate issued by the appropriate authority granting approval for water and sewer facilities" as part of the application - on unsewered acreage that means the state onsite wastewater permit, which comes from the South Carolina Department of Environmental Services under Regulation 61-56 and not from the county at all. Sec. 14-270 puts the floodplain manager for the Department of Community Development in the chain for anything in a flood hazard area: documented approval before construction, and no final inspection and no certificate of occupancy until that office has concluded the Lexington County Flood Damage Prevention Ordinance has been met. Sec. 14-262 exempts one-storey detached accessory structures of 200 square feet or less from needing a building permit at all - a number a barndominium shop clears many times over.

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 Lexington County

All nine services are available in Lexington 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 Lexington 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 Lexington 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 Lexington 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.

Richland County

Building in Lexington County: common questions

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

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Can the shop be bigger than the house here?

In Lexington County the zoning ordinance does not answer that question with a number, because it does not regulate accessory building size at all. Section 21.20 treats accessory activities as part of the principal activity and says they "shall be controlled in the same manner as its associated principal activity except as otherwise provided in this Ordinance," and the only dimension the ordinance otherwise provides for a residential accessory building is in Section 23.30: "accessory buildings to residential activities must maintain a minimum 5-foot setback from adjoining property lines." There is no percentage-of-the-dwelling ceiling and no maximum square footage. That is genuinely unusual - several South Carolina counties cap a detached shop at half the house's floor area, or at a fixed figure, or both. Two things still bound it in practice. Section 12.10 defines an accessory structure as one "appropriately incidental and subordinate" to the principal activity, and the Zoning Administrator has the express power under the same section to interpret that word, so a very large detached building beside a small dwelling is a conversation to have at the counter rather than an entitlement. And the simplest route avoids the question entirely: if the shop bay and the living space are one continuous building, it is not accessory to anything. It is the dwelling, permitted as a Residential Detached activity, and designed and inspected as a dwelling from end to end.

How tall can I actually build it?

Taller than most people expect, and the mechanism is unusual enough to be worth understanding. Lexington County does not publish a flat height cap. Section 23.10 of the Zoning Ordinance builds height out of a control slope: "initially, a 20-foot rise is permitted at the property line perpendicular to the property line," and then a ratio of vertical rise to horizontal distance is applied moving inward, so the further your building sits from the line the taller it may be. On the 1:1 slope the ordinance's chart assigns to Residential Detached in a Restrictive Development District, that works out to 25 feet at 5 feet from the line, 40 feet at 20 feet and 70 feet at 50 feet. But the section then exempts the case most readers are in: "The International Residential Code for One- and Two-family Dwellings allows no more than three stories above-grade in height; therefore, any Residential Detached or Residential Attached (2 dwelling units) activity that meets a 5-foot setback from adjoining property is exempt from the height requirements of this section." So for a detached house that keeps five feet of clearance, the binding limit is the residential code's three storeys above grade plane, not a county number. A 16-foot overhead door, a clear-span shop and a loft over the living end are all ordinary here. Check the parcel for the Airport District overlay before you design, because Article 4 sets separate rules around the airport.

My land has a Columbia or a Lexington address. Who actually permits it?

Check the tax map number, not the mailing address, and in this county check it twice. The City of Columbia's limits cross into Lexington County, so a Columbia postmark can mean the city, or Richland County, or Kershaw County, or this one. And the Town of Lexington is a separate municipality inside Lexington County with its own permitting - the two share a name and nothing else. The county's own reach is settled by Section 11.20 of the Zoning Ordinance, which applies the regulations to all land shown on the Zoning Maps for Lexington County, and by Section 12.00(g), which defines "County" as "the area of jurisdiction of Lexington County, South Carolina, excluding all incorporated municipalities." There is no unzoned pocket left over - the unincorporated area is mapped, and the incorporated places are outside. Cayce, West Columbia, Irmo, Springdale, Pine Ridge, South Congaree, Gaston, Swansea, Gilbert, Pelion, Chapin, Batesburg-Leesville and Summit all run their own limits too. The county's Department of Community Development at 212 South Lake Drive in Lexington will confirm which side of a line a parcel falls on, and that is the call to make before the offer, not after.

Can I put it up as a farm building and skip the residential code?

No, and South Carolina closes this cleanly in the statute rather than leaving it to argument. S.C. Code § 6-9-65(A) defines a farm structure as one built on a farm "other than a residence or a structure attached to it." A barndominium is a residence, so it falls outside the exemption in every case, and the shop half welded to the side of one falls outside it too because the definition excludes a structure attached to the residence. There is no square-footage test and no percentage-of-use test to work with. Three further points from the same section. § 6-9-65(C) makes the exemption conditional on the owner filing an affidavit with the local building official before construction stating the structure is being built as a farm structure. The definition excludes any structure "originally qualifying as a farm structure but later converted to another use," so putting up a pole barn under the exemption and finishing it into living space later takes it straight back out. And § 6-9-65(B) preserves the National Flood Insurance Program standards regardless, so the exemption never reaches flood. A genuinely separate barn or equipment shed on the same land can qualify. The building anyone sleeps in cannot - and note that Lexington County Code Sec. 14-172 puts a dwelling's accessory structures under the residential code alongside the dwelling in any event.

What wind speed and seismic category apply to my parcel?

The wind speed comes off a state map rather than a county chart. Reg 8-1202 replaced IRC section R301.2.1 with "the previously published maps by the South Carolina Building Codes Council," and the Council's approved sheet for Lexington County carries 115 MPH contour labels. Note the word contour: the map says on its face that a wind speed "applies at all points along the length of its corresponding (blue) line" and that interpolation between wind speed lines "is determined by the AHJ." So the honest answer is a map, a value read at the parcel, and a building official who interpolates. Seismic works the same way under Reg 8-1203, but the Lexington sheet's machine-readable text carries no seismic design category label, so no category is stated on this page - ask the county building official to read it off the Council sheet for your tax map number and put it in writing. Two things are worth knowing about why that matters less here than on the coast. The residential code's seismic provisions do not reach a detached one- or two-family dwelling until Seismic Design Category D0 (R301.2.2), and South Carolina's D1 and D2 ground is in the Lowcountry. And 115 mph is the lowest band the Council maps anywhere in this state, so the wind case for a wide, tall, lightly clad building here is about uplift and lateral bracing detailing rather than about a coastal number.

Septic on Sandhills sand - what should I check before I buy?

Everything, and before the offer closes rather than after. Septic is a state permit, not a county one: the South Carolina Department of Environmental Services permits onsite wastewater systems under Regulation 61-56, and the county's role is only that County Code Sec. 14-272 lets the building official require the water and sewer approval certificate with the building permit application. The soil here is the issue. Lexington County carries 126,469 acres of Lakeland - a deep, excessively drained sand, and the largest acreage of it in the State - plus 25,587 acres of Fuquay. Deep sand fails in two opposite directions on a septic evaluation. It can be too permeable to treat effluent properly. Or, on the Sandhills units, a fragipan or plinthite layer can sit close to the surface, and R.61-56 § 200.5 disqualifies a site where a restrictive horizon lies within twelve inches of the trench bottom. The regulation sizes the drainfield off the most hydraulically limiting layer, so two parcels that look identical from the road can need very differently sized fields. § 200.7 then requires a usable repair area equal to at least half the original system, on proven soil, clear of the drive and the shop - and a 60-foot-wide building with a turning apron eats that room fast. Have a soil evaluation run, or hire a licensed Professional Soil Classifier, and site the drainfield and its reserve before you site the pad.

What is this going to cost me in county fees?

Lexington County publishes its whole schedule, and one line on it is unusual enough to plan around. The zoning permit for a residential use, and for anything accessory to it, is charged at $75.00 per acre or portion of an acre - not per building. The residential landscape permit is charged the same way. On a large homesite those are meaningful numbers, and they scale with the land rather than the house, which is the opposite of how most people budget. The building permit itself runs on construction valuation in bands: a $50 minimum, $50 flat to $4,000, then $50 plus $5 per thousand to $100,000, $450 plus $5 per thousand to $250,000, $1,185 plus $3 per thousand to $500,000, and $1,700 plus $2 per thousand above that. Around them sit a $115.00 residential plan or permit revision fee, a $45.00 compliance inspection, no charge for the first re-inspection and $60.00 for each one after it - including where the inspector arrives and the work is not ready - a $262.00 stop work order release, a $50.00 temporary power for occupancy permit and a $31.00 replacement certificate of occupancy. County Code Sec. 14-337 adds a further Council-set fee on top of everything where work started before the permit issued, and Sec. 14-331 makes clear a permit is not valid until the fee is paid. Septic is separate and is a state charge, not a county one.

Building in Lexington 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.

Start your project