Charleston County, SC Building Setbacks & Zoning: Setback Rules (2026)
Key Facts
- R-4 front
- 25 feet
- R-4 interior side / rear
- 5 ft / 15 ft
- AGR front / side / rear
- 50 / 15 / 30 feet
- Waterfront
- OCRM critical-line setback applies
- Code section
- ZLDR §4.2.3; Tables 4.10.3, 4.79.3
Summary
Setbacks depend on the zoning district. In the common R-4 Single Family Residential district the minimums are 25 feet front/street side, 5 feet interior side, and 15 feet rear. Rural AGR (Agricultural/Residential) requires 50 feet front, 15 feet side, and 30 feet rear. Waterfront lots add critical-line setbacks.
MINIMUM SETBACKS — Front/Street Side: 25 feet; Interior Side: 5 feet; Rear: 15 feet.
Full Breakdown
ZLDR §4.2.3 defines a setback as the unobstructed open area between the furthest projection of a structure and the property line. Table 4.10.3 sets R-4 minimums at 25 ft front/street side, 5 ft interior side, 15 ft rear (reduced on waterfront lots). Table 4.79.3 sets AGR minimums at 50 ft front/street side, 15 ft interior side, 30 ft rear, with a 50-ft OCRM critical-line setback on waterfront. Certain projections (eaves, chimneys, fire escapes) may encroach a limited distance. Sea-island and rural districts (AGR, AG-8/10/15) carry the larger setbacks; verify your parcel's zoning.
Violations & Fines
Building within a required setback without a variance is a violation; the Zoning & Planning Department may deny permits, order correction, or require a zoning variance under ZLDR Article 3.10.
Frequently Asked Questions
What are the setbacks for a typical suburban lot?
Why are rural setbacks so much larger?
Sources & Official References
Other rules in Charleston County
Compare Charleston County to another location·View the South Carolina building setbacks & zoning overview
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