Spartanburg County, SC Accessory Structures: Garage Conversions (2026)
Garage conversion rules in Spartanburg County, SC, sometimes called garage-to-ADU or accessory living unit conversions, govern permits, ceiling height, egress, and parking replacement.
Key Facts
- Dedicated rule
- None; treated as accessory apartment
- Garage status
- Defined as accessory building
- Size cap if habitable
- One-third of principal dwelling
- Permit
- Building permit required
- Governing code
- ULMO Section 3.05 and 3.20
Summary
Spartanburg County's ULMO has no dedicated garage-conversion section. A detached garage is defined as an accessory building; converting it into habitable living quarters creates an accessory dwelling unit and must meet the Section 3.05 one-third-size limit, Table 3 setbacks, and building code.
Building, Accessory - A subordinate structure on the same lot as the principal or main building or use occupied or devoted to a use incidental to the principal use. Included in this definition are private garages, storage sheds, workshops, domestic animal shelters, pool houses, etc.
Official source re-checked September 8, 2026: the cited page had not changed since it was quoted.
Full Breakdown
The ULMO classifies private garages, storage sheds, and workshops as accessory buildings incidental to the principal dwelling. There is no separate ordinance authorizing a habitable garage conversion; once you add sleeping, cooking, and sanitation to a detached garage it becomes an accessory dwelling unit governed by Section 3.05 (no larger than one-third of the principal dwelling, meeting Table 3). It also requires a building permit and must satisfy the International Residential Code for occupancy. Converting an attached garage into a room is a residential building-code matter. Confirm with County Planning & Development whether the ULMO or the Southwest Performance Zoning Ordinance covers your address.
Violations & Fines
Adding a habitable/rental unit to a garage without a building permit and required approvals is a code violation subject to enforcement and orders to correct or vacate.
Frequently Asked Questions
Can I convert my detached garage into an apartment?
Is there a specific garage-conversion ordinance?
Sources & Official References
Other rules in Spartanburg County
Compare Spartanburg County to another location·View the South Carolina accessory structures overview
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