Accessory Structures in Simpsonville, SC: What Residents Actually Need to Know

If you live in Simpsonville or are thinking about moving there, accessory structures are one of those things you probably won't think about until they affect you directly. Simpsonville has 5 specific rules on the books covering different aspects of accessory structures, and some of them might surprise you.

Shed Rules

On single-family residential lots, an accessory structure such as a shed must meet a 5-foot accessory-structure setback from side and rear property lines and cannot sit closer to the street than the front wall of the home. A zoning permit is waived for single-family accessory structures, but a building permit

Key details: Accessory setback (SFR): 5 feet, side and rear. Front placement: Behind front wall of house. Zoning permit (SFR shed): Not required (Sec. 7.7.2.B). Shipping containers/pods: Not allowed as accessory structure. Ownership: Same lot and owner as principal use.

A shed placed in the setback or forward of the front wall can be cited as a zoning violation; the City may require relocation or removal and withhold related permits. Penalties follow Code section 1-9.

ADU Rules

Simpsonville's Zoning Ordinance sharply limits ADUs. Under Section 3.3.4, an accessory dwelling unit may only be placed on stories above the ground floor of a nonresidential building (or in an approved live-work arrangement). There is no by-right detached backyard ADU/granny-flat allowance for single-family lots.

Key details: Governing rule: Zoning Ord. Sec. 3.3.4. Where ADUs allowed: Above-ground floors, nonresidential bldgs. Backyard detached ADU: Not a by-right use. RV/mobile home as ADU: Prohibited. Same lot required: Yes, subordinate to principal use.

Building or occupying an unpermitted dwelling violates the Zoning Ordinance; the City may withhold permits, issue stop-work orders, and require removal. Penalties follow Code section 1-9.

Garage Conversions

Simpsonville's Zoning Ordinance has no special garage-conversion allowance. Converting a garage into living space is a change of use of a structure that triggers a building permit under Chapter 8; it may not create a second dwelling unit, since accessory dwelling units are limited to upper floors of nonresidential buildings

Key details: Special conversion rule: None; general permit rules apply. Building permit: Required (change of occupancy). Second dwelling unit: Not allowed via garage (Sec. 3.3.4). Governing chapter: Ch. 8 Buildings; Zoning Sec. 7.7. Parking: Must still meet off-street standards.

An unpermitted conversion or an illegal second unit is a code violation; the City may issue stop-work orders, withhold certificates of occupancy, and require reversal. Penalties follow Code section 1-9.

Carport Rules

A carport is an accessory structure in Simpsonville. On single-family residential lots it must meet the 5-foot accessory-structure setback (Sec. 2.2.5) and, per Section 3.3.1.E, cannot be located closer to the street than the front wall of the house. A building permit under Chapter 8 generally applies.

Key details: Classified as: Accessory structure. Setback (SFR): 5 feet, side and rear. Front placement: Behind front wall of house. Carport-specific rule: None; general accessory rules. Building permit: Generally required (Ch. 8).

A carport in the setback or forward of the front wall is a zoning violation subject to relocation or removal orders and permit withholding. Penalties follow Code section 1-9.

Tiny Homes

Simpsonville's Zoning Ordinance has no dedicated tiny-home category. A tiny house on wheels is treated as a recreational vehicle or travel trailer, which cannot be used as a dwelling or accessory dwelling unit. A tiny house on a foundation must meet all standard single-family district and building-code requirements.

Key details: Tiny-home ordinance: None specific. Tiny house on wheels: Treated as RV; not a dwelling. On foundation: Must meet SFR + building code. As accessory unit: Not permitted (Sec. 3.3.4). Verify with: Planning & Codes Department.

Occupying a non-conforming tiny house or RV as a dwelling is a zoning violation; the City may require removal and withhold permits. Penalties follow Code section 1-9.

The Bottom Line

Simpsonville's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Simpsonville is broadly strict or permissive.

These rules come from Simpsonville's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.