Garage conversion rules in Biloxi, MS — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a garage to habitable space in Biloxi requires a Certificate of Zoning Compliance and a building permit from the Community Development Department. The work must meet the Mississippi-adopted International Residential Code (IRC) and Land Development Ordinance setback, parking, and zoning standards. Loss of required off-street parking is a common denial reason.
Biloxi's Community Development Department (676 Dr. Martin Luther King Jr. Blvd.) administers building permits and zoning review. A garage conversion to living space is a change of use that requires both a Certificate of Zoning Compliance from the Planning Division and a residential building permit from the Building Division before construction begins. The completed space must meet the IRC minimum room dimensions, ceiling height (typically 7 feet), egress window sizing, smoke and carbon monoxide alarm placement, insulation, and wall/ceiling fire-rating standards adopted by Mississippi. Zoning review verifies that the converted dwelling area still complies with the Land Development Ordinance setback, lot-coverage, and required off-street parking standards for the underlying district; Biloxi has no statewide ADU preemption, so single-family zones may not permit a separate dwelling unit even if the conversion is otherwise code-compliant. Detached accessory structures must observe minimum side and rear setbacks of 3 feet. Confirm specific permit packets with Building at (228) 435-6270 and Planning at (228) 435-6266.
Converting a garage without a Certificate of Zoning Compliance and building permit, or eliminating required off-street parking, violates the Biloxi Land Development Ordinance and may trigger stop-work orders, fines, and removal orders under Section 23-9-6. Unpermitted work also blocks future Certificates of Occupancy and complicates resale.
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Side-by-side rule comparisons with other cities in Harrison County.
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