Building permits, zoning and septic rules across South Carolina

No South Carolina county is listed as broadly exempt from residential building permits: 44 require them and 2 require them only in some cases¹. Barnwell County and Colleton County are the limited-requirement counties; that classification does not mean every home avoids a building permit¹.

South Carolina's 2021 building codes remain the current framework, with the adopted 2024 codes scheduled for implementation January 1, 2027^9,10. Building-permit fees and administrative procedures belong to the local jurisdiction, so ask the applicable building official for the application requirements and fee schedule^11,12. The owner-builder options require personal supervision, personal or family occupancy, compliance with codes and zoning, and a public notice filed with the register of deeds⁷.

South Carolina has 5 counties without county-wide zoning: Williamsburg County, Allendale County, Saluda County, Laurens County and Cherokee County². The South Carolina no-zoning county list is a starting point for that search, while 40 counties have county zoning^1,2.

Absence of county-wide zoning does not establish absence of building permits: no county is listed with neither a residential building-permit requirement nor county-wide zoning¹. South Carolina authorizes counties to zone all or specific parts of their unincorporated territory, with regulations differing by district¹³. Ask the county planning office which district and land-development rules cover the actual parcel; locally adopted subdivision regulations can require plan approval before recording or building-permit issuance¹³.

South Carolina Department of Environmental Services is the septic authority across all 46 counties¹. For a home or manufactured home on land without public or community sewer, obtain SCDES approval and a septic installation permit first; the county cannot issue the building permit without that septic permit⁴. Accessible public sewer prevents issuance of an onsite wastewater permit, so establish sewer accessibility before applying¹⁴.

South Carolina septic Permits to Construct are valid for 5 years; renewal or approved changes require a new application and fee⁴. A site evaluation is required for a new home using septic, and the installer must arrange the final inspection before covering the system¹⁵. Contact SCDES Onsite Wastewater Customer Support for application questions before submission or copies of existing septic permits¹⁶. Off-grid sanitation is also regulated: alternative toilet-waste systems require departmental construction and operating approvals, and graywater treatment needs its own onsite wastewater approval^17,18.

Barnwell County leads the Bolthole Index's South Carolina off-grid and homestead land scores at 70 out of 100, followed by Williamsburg County at 69 and McCormick County at 68¹. Barnwell has limited residential building-permit requirements and zoning; Williamsburg requires residential building permits but has no county-wide zoning; McCormick requires residential building permits and has zoning¹. Abbeville County and Colleton County follow at 66, then Fairfield County, Georgetown County and Greenwood County at 65¹. All these counties use the state septic authority¹.

The median county farmland value is $3,802 per acre; Lee County has the lowest listed value at $2,655 per acre¹. Those are farmland benchmarks, not asking prices for individual building lots¹. The median county effective property-tax rate is 0.5%, and the median county property-tax bill is $852 annually¹.

Before constructing an individual residential or irrigation well in South Carolina, the owner, agent or driller must submit a Notice of Intent for General Permit coverage⁸. The residential-well fee is $70; the irrigation-well fee is $50⁸. The well driller must notify SCDES 48 hours before installation with the exact date, time and location⁸. Contact the SCDES Private Drinking Water Wells Program about residential well construction approvals⁸.

South Carolina has 28 counties inside a special groundwater management regime, but construction approval and groundwater withdrawal approval are separate questions^8,19. A well or system withdrawing more than 3 million gallons in a month also needs a Groundwater Withdrawal Permit⁸. Wells supplying multiple households or a small business follow public-water-supply permitting procedures⁸.