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

Yes. Unincorporated Williamsburg County requires a building permit and sequential inspections for residential construction; approved plans must remain on site and the permit must stay posted¹. Residential plans for one- and two-family dwellings, additions and attached garages must follow the current residential code, and the application must include two sets of construction plans and site plans¹⁴. The county enforces South Carolina's adopted building codes, and plans outside those codes' scope require a South Carolina-licensed design professional¹⁵. A qualifying owner may build a residence for the owner's sole occupancy or family, but must personally apply for the building permit and supervise construction, use licensed contractors where required, and record notice as an unlicensed builder⁸. Sale or rent within two years is evidence that the project did not qualify unless the commission approves otherwise⁸. Commercial projects require special inspections for rebar, concrete and structural steel¹⁵.

Williamsburg County Code Enforcement handles building inspections for new residential and commercial construction and manufactured-home installation in unincorporated areas². The office is at 201 W Main Street, Suite 121, Kingstree, SC 29556; call 843-355-9321, extension 5300¹⁶. Inside Greeleyville, the town handles building permits and also requires local sewer or septic connection approval; state septic approval still applies^17,18. Andrews, which reaches into Williamsburg County but lies mainly in Georgetown County, has its own building-permit rules, including a qualifying owner-work exemption; septic tanks require state approval and cannot be newly approved where sewer lines are provided^19,20. The county publishes construction applications, residential and commercial plan requirements, and a building-permit fee schedule; ask Code Enforcement for the detailed inspection list for each discipline². Residential requirements call for 24 hours’ inspection notice, but the sequential-inspection page says at least 48 hours; confirm scheduling with Code Enforcement^1,14.

Williamsburg County's ordinance list does not show a comprehensive ordinance establishing countywide zoning districts, but that does not make rural land unrestricted⁶. Unincorporated property follows county Land Development Regulations; ask Kingstree or Hemingway about additional requirements inside their town limits³. Andrews, a town mainly in Georgetown County that reaches into Williamsburg County, sets its own zoning; state septic approval remains required there, and new septic tanks are prohibited where sewer lines are provided^20,21. Dividing unincorporated land into two or more lots for sale, building or development requires Planning Commission approval before recording¹³. In those subdivisions, a lot with a well and septic tank must have at least one acre; a lot with public water and septic must have at least 25,000 square feet; and a residential lot with public water and sewer must be at least 60 feet wide and 6,000 square feet¹³. Subdivision plans must show setback lines, but the cited rule gives no numeric setback¹³. Ask Code Enforcement about standards outside a subdivision and the applicable town about municipal zoning approval^4,16.

For a Williamsburg County home or manufactured home without public or community sewer, obtain SCDES approval and a Permit to Construct before the county building permit⁵. Submit the onsite wastewater application online through the ePermitting Portal with a plat or deed and the $150 fee; traditional permitting includes a site visit⁵. The Permit to Construct lasts five years; renewal or changes require a new application and fee⁷. Only about 2% of county soils lack severe limitations for a conventional drain field, so make septic feasibility a purchase contingency²². A licensed installer must install the system and schedule SCDES inspection before covering it⁵. If the inspector does not arrive within 30 minutes of the scheduled time, a licensed installer may self-inspect and submit the approved final-inspection form⁷. For subdivision lots without accessible or planned public services, alternate water supply or sewage disposal needs written health-officer approval, and septic lots must reserve space for a replacement system¹³.

We could not confirm a general Williamsburg County rule authorizing long-term RV living or tiny-home occupancy on private land. In an unincorporated campground or recreational vehicle park, every associated structure needs a county building permit and inspection, cabins and tiny homes must meet residential building-code standards, and utility buildings cannot be occupied¹². That campground rule does not answer occupancy elsewhere. Unincorporated parcels still follow Land Development Regulations, and land inside Kingstree, Hemingway or Andrews may face additional municipal requirements³. Before placing an RV or tiny home, give Code Enforcement the parcel number and ask about building permits, occupancy and sanitation; inside a town, also ask the town about zoning approval^4,16.

1. Give Code Enforcement the parcel and confirm whether the county or an incorporated town issues the building permit and zoning approval; SCDES handles any needed septic permit^4,7,16.

1. If dividing the tract, obtain Planning Commission approval before recording, and verify the utility-based lot-size and setback-plan requirements¹³.

1. If septic is needed, submit the onsite wastewater application, plat or deed and $150 fee to SCDES, then obtain the Permit to Construct⁵.

1. For a private residential well, submit the Notice of Intent and $70 fee before construction; the driller must give SCDES 48 hours' notice before installation¹¹.

1. Submit two sets of construction plans and site plans; construction in an A or AE flood zone also requires a Flood Elevation Certificate^2,14.

1. Post the building permit, keep approved plans on site and confirm the inspection lead time with Code Enforcement because county sources give both 24 and 48 hours^1,14.

1. Schedule the SCDES septic inspection before covering the system, then complete the county certificate-of-occupancy inspection^1,7.

Start with septic: only about 2% of Williamsburg County soils lack severe limitations for a conventional drain field, so obtain a site evaluation before treating a tract as buildable²². For a proposed subdivision, confirm whether the water-and-sewer combination triggers the one-acre, 25,000-square-foot, or 6,000-square-foot minimum, and leave room for a replacement septic system where applicable¹³. If no public water is available, budget for the residential-well Notice of Intent and $70 fee before drilling¹¹. Check the flood map because construction or development in A and AE zones requires a Flood Elevation Certificate². The elevation certificate does not establish that all floodplain requirements have been met; ask Code Enforcement what else the parcel needs^2,16. Ask the road authority about driveway approval because we could not confirm a countywide rule. Confirm whether the parcel is unincorporated: towns have separate approval processes, and SCDES approval remains necessary for a home without public or community sewer^4,7.