Building permits, zoning and land rules in Darlington County, South Carolina

Unincorporated Darlington County requires county building permits, and the Codes Enforcement Department handles building permits, plan reviews and mobile-home inspections^1,2. Darlington County enforces the current state-adopted codes². The current 2021 South Carolina Building Codes took effect January 1, 2023; the state has adopted the 2024 editions for local implementation on January 1, 2027^11,12. Inside Society Hill, building, structural additions and mobile-home placement require a town building permit; apply to the town clerk at least 5 days before work⁴. SCDES still handles septic approval there where public or community sewer does not serve the property⁵. A farm structure other than a residence or a structure attached to a residence is exempt from the relevant nationally recognized building-code provisions after the owner files the required affidavit, but the exemption does not remove county permitting authority or federal flood standards¹³. Ask Codes Enforcement whether your exact project needs a permit because the county's published page does not give a complete project-by-project list.

Darlington County Codes Enforcement works at 1 Public Square, Room 303, Darlington, SC 29532; call 843-398-4011². Codes Enforcement handles building permits, plan reviews and mobile-home inspections, but it does not handle site plans, septic tanks, mobile-home registration or rental-property inspections². Take site-plan and zoning questions to Darlington County Planning, which is in the same room and can be reached at 843-398-4610⁶. The county provides downloadable forms and an online-permit link, although its department page does not publish the complete application, review and inspection sequence². For a qualifying owner-built home, the owner must personally sign the permit application, supervise construction, use properly licensed trades where required and record the statutory notice⁷. A sale or rental within 2 years after construction is complete creates a presumption that the exemption did not apply unless the commission approves otherwise⁷.

SCDES permits septic systems in Darlington County, including municipal land without public or community sewer⁵. SCDES approval and a Permit to Construct must precede the county building permit for such property⁵. The application fee is $150, and a Permit to Construct remains valid for 5 years; renewal or an approved change requires a new application and another fee⁵. Before a new system is covered, the installer must contact SCDES to schedule the installation inspection⁵. South Carolina does not require routine inspection of every existing septic system, although a town may adopt a local inspection ordinance¹⁴. Only about 20.3% of Darlington County soils are rated without severe limitations for a conventional drain field, so make the site evaluation an early contingency in a land contract¹⁰. SCDES will not issue an onsite-wastewater permit where public sewer is accessible, so verify sewer availability before paying for septic design work¹⁵.

We could not confirm a rule that allows or prohibits using an RV as a residence on private land in county jurisdiction, either temporarily or long term. We also could not confirm county-jurisdiction rules for tiny-home occupancy, minimum dwelling size or accessory dwellings. Land-use authority varies by parcel location; use County Planning for unincorporated land and the relevant municipal authority inside city or town limits³. Ask County Planning at 843-398-4610 for county-jurisdiction land, or the relevant municipal office for property inside a city or town, before buying an RV or tiny home for the site⁶. A tiny home used as a dwelling still enters a process in which Codes Enforcement handles building permits and plan reviews². A manufactured home follows a distinct path: Codes Enforcement handles its inspection but expressly does not handle mobile-home registration².

1. Identify the parcel's jurisdiction before relying on any zoning answer: county development standards apply in county jurisdiction, while municipal zoning applies inside incorporated jurisdictions³.
2. Ask the correct planning authority to confirm allowed use, setbacks and site-plan requirements; County Planning is the contact for county-jurisdiction questions⁶.
3. Verify whether public sewer is accessible; if it is not, obtain SCDES septic approval before seeking the county building permit^5,15.
4. If you will drill an individual residential well, submit the SCDES Notice of Intent before construction; the well driller must give SCDES 48 hours' notice before installation⁸.
5. For unincorporated land, apply through Darlington County Codes Enforcement for building permits and plan reviews under the current state-adopted codes².
6. If using the owner-builder exemption, personally sign the application, supervise the work, hire licensed trades where required and record the required notice⁷.
7. Resolve road access, then arrange the required building and septic inspections before covered work becomes inaccessible^5,9,13.

Water: an individual residential, irrigation or replacement well requires an SCDES Notice of Intent before construction, and the well driller must provide 48 hours' notice before installation⁸. Septic and soils: only about 20.3% of Darlington County soils are rated without severe limitations for a conventional drain field, and SCDES cannot issue an onsite-wastewater permit where public sewer is accessible^10,15. Access: determine whether the frontage is on a county road or state highway before assuming a driveway location; SCDOT's limited program applies to one qualifying standard state-highway driveway with a paved throat no wider than 16 feet⁹. Flood risk: the county's ordinance index identifies Flood Hazard District provisions, but we could not confirm the operative permit requirements, so ask Planning before relying on a survey or site plan¹⁶. Land division: Darlington County's Planning Commission grants or denies subdivision approvals¹⁷. Taxes: the effective property-tax rate is about 0.4%, and the median annual bill is about $604¹⁰. The nearest city of 100,000 or more is about 60 miles from the county center¹⁰.