Jackson County, MS Accessory Structures: Garage Conversions (2026)

Jackson County handles garage conversions through local building and zoning ordinances in Pascagoula, Ocean Springs, Moss Point, Gautier, and Vancleave, with unincorporated areas under county authority. Converting a garage to living space requires a building permit and must comply with local residential building codes (International Residential Code adopted on the Gulf Coast) for habitable rooms. Habitability requirements include insulation to current R-value standards, egress windows meeting size and sill-height rules, 7-foot minimum ceiling height, electrical upgrades to 20-amp habitable circuits with GFCI/AFCI protection, and HVAC extension. The conversion must not reduce off-street parking below the minimum required by zoning (typically 2 spaces per single-family dwelling). Replacement parking may need to be provided through driveway expansion, carport construction, or adding a new detached garage. Fire separation between the converted space and the main dwelling must meet code requirements, including 5/8-inch Type X gypsum board on common walls if attached. Mississippi municipalities may restrict garage conversions in certain historic districts like the Pascagoula historic core or Ocean Springs' arts district, where preserving original architecture is prioritized. Flood zone properties (common in coastal Jackson County) face additional challenges because converted living space must be elevated above base flood elevation under FEMA NFIP regulations, which often makes conversion impractical in VE or AE zones without substantial improvements. Hurricane wind load requirements from post-Katrina building code updates apply to any new walls, windows, or door replacements during conversion.