Building permits, zoning and septic rules in Oconee County, South Carolina

Oconee County's Building Codes Division requires a building permit before you start any new building construction, addition, alteration, renovation or demolition of an existing structure in unincorporated Oconee County¹. The division enforces the building codes the county adopted by reference there and, by contract, provides building-code service inside Salem, Walhalla, Westminster and West Union^1,8. South Carolina's current mandatory codes are the 2021 editions, effective since January 1, 2023; the state has adopted 2024 editions for local enforcement beginning January 1, 2027^9,10. A one-story detached accessory structure of 400 square feet or less is exempt from a building permit under the county's local amendments⁸. Commercial construction, a single-family home over 5,000 square feet, and alternate or engineered construction require plan review before the permit¹.

Oconee County Building Codes is at 415 S. Pine St. in Walhalla and can be reached at 864-718-1005; the office is open Monday through Friday, 8:30 a.m. to 5:00 p.m., with new permitting cut off at 4:00 p.m¹.. Oconee County Planning & Zoning, in the same building, handles zoning permits, subdivision and land-use review, variances and mobile home moving and set-up permits, and can be reached at 864-638-4218 or planninginfo@oconeesc.com¹¹. The county also permits online through a portal called CitizenServe for many of these applications¹¹. The Oconee County Assessor, reachable at 864-638-4150, issues the moving permit required when a used mobile home is brought into the county^1,12.

Oconee County zoning applies in the unincorporated county, where all land begins in the Control Free District unless local citizens request rezoning². The Control Free District does not limit uses, but overlay districts, performance standards, building codes and other county-enforced rules still apply to those parcels¹³. Rezoned land can carry district-specific controls: in the Residential District, the minimum lot is one-quarter acre where utilities are available and one-half acre where they are not¹⁴, and setbacks are 25 feet in front, 5 feet on the sides and 10 feet in the rear¹⁴. The Lake Residential District has its own, different setback table¹⁵. Planning & Zoning handles zoning permits, land-use review, variances and special exceptions^2,11. Ask Planning & Zoning to identify the parcel's current district and any overlay before relying on a proposed use or site layout, because zoning compliance must be certified before a county permit can issue^1,11. County zoning does not apply inside incorporated municipalities, where each town sets its own land-use rules; septic and wells stay with the state either way^3,16. For a project that requires a site plan under the zoning ordinance, the county will not issue a Certificate of Occupancy until the required site plan is complete and an approved as-built plan is on file².

Oconee County does not design, inspect or approve septic systems; South Carolina's Department of Environmental Services (SC DES) handles site approval and the septic permit statewide, including in Oconee County^3,4. You must obtain SC DES's site approval and septic permit before Oconee County can issue your building permit, and a septic permit generally cannot be issued at all where the property has access to public or community sewer^4,17. A Permit to Construct is good for five years, and installation requires a final check, either an on-site inspection by an SC DES representative or a completed Certification by Installer form, before the system can be covered¹⁸. If an SC DES inspector does not arrive within 30 minutes of the scheduled time, a licensed installer may self-inspect and submit Form D-4432⁴. About 32.4% of Oconee County's soils rate free of severe limits for a conventional septic drain field in the USDA soil survey, so a majority of the county's rural land is more likely to need a site-specific design, an engineered system, or a larger drain field than a simple, low-cost layout¹⁹.

Oconee County's Control Free District and rezoned districts do not by themselves answer whether an RV or tiny home may be occupied on a particular parcel². We could not confirm a countywide rule for RV residence or a minimum tiny-home size, so ask Planning & Zoning about the proposed structure, duration of occupancy, parcel district and any overlay before buying¹¹. A manufactured or mobile home follows a separate process: it needs a set-up permit and decal, a bill of sale if new or an Assessor moving permit if used, and completed set-up inspections before electrical service can be approved¹. Short-term rentals, including campground spaces, must be registered with Oconee County and collect local accommodations tax²⁰. Do not treat the manufactured-home process as approval for an RV or park model.

1. Confirm your parcel's zoning district, any overlay district and setback or buffer requirements with Planning & Zoning at 864-638-4218 before you finalize a site plan; zoning compliance must be certified before a county permit can issue^1,11.
2. Apply to South Carolina's Department of Environmental Services for site approval and a septic permit if the property is not served by public or community sewer; without it, Oconee County cannot issue your building permit⁴.
3. If you plan to drill a well, submit a Notice of Intent to SC DES before construction; the fee is $70 for an individual residential well, and the well driller must notify SC DES 48 hours before installation⁶.
4. Apply for your building permit at Oconee County Building Codes, 415 S. Pine St. in Walhalla; commercial construction, a single-family home over 5,000 square feet, and alternate or engineered construction require plan review first¹.
5. If you intend to act as your own unlicensed builder under South Carolina's owner-builder exemption, personally supervise the work, sign the permit application yourself, and file the required public notice with the Register of Deeds; selling or renting within two years of completion creates a legal presumption the exemption did not apply⁵.
6. If your driveway will connect to a state highway, SCDOT will permit and construct a standard driveway, up to 16 feet of paved width, at its own expense within its right-of-way⁷.
7. Schedule inspections with Building Codes at the intervals set for your permit type, before 4 p.m.; a $75 fee may be charged when an inspection is scheduled before the work is complete¹. If the zoning ordinance requires a site plan, complete it and place an approved as-built plan on file before requesting the Certificate of Occupancy².

Ask Planning & Zoning which zoning district and overlay, including the lake overlay district and vegetative buffer where they apply, cover the specific parcel, since those set the real limits on use, setbacks and RV or tiny-home occupancy¹¹. Budget for a site-specific septic design on much of the county's land: only about 32.4% of Oconee County's soils rate free of severe limits for a conventional drain field in the USDA soil survey¹⁹. If you are dividing land into parcels of five acres or more with no new street, South Carolina treats that division as an information-record exception rather than a full subdivision review, which can simplify splitting a larger tract among family members²¹. Confirm whether the property already has an approved septic permit or usable septic system, since a new one cannot be issued where public sewer is accessible and a fresh site evaluation takes time¹⁷. The nearest city of 100,000 or more is about 59 miles from the center of Oconee County¹⁹.