5 county-level rules, plus city-specific rules for 4 cities in Desoto County, Mississippi.
Verified from official government sources
DeSoto County, MS handles accessory dwelling units entirely through local zoning under MS Code Ann. §17-1-1 et seq., with no statewide ADU preemption law like California's. Southaven, Olive Branch, Horn Lake, and Hernando each set their own rules, typically permitting ADUs in certain residential zones by right or conditional use, with size caps of 600-1,000 square feet or a percentage of the primary dwelling, owner-occupancy requirements, separate utility connections, and off-street parking. Growing housing demand in the Memphis metro is pushing DeSoto cities to consider more permissive ADU policies.
DeSoto County requires building permits for sheds over 200 square feet in unincorporated areas. Setback requirements apply from property lines and easements along utility corridors near the growing suburban fringe.
DeSoto County, MS regulates garage conversions through municipal building and zoning codes adopted under MS Code Ann. §17-1-1 et seq. Converting a garage to living space in Southaven, Olive Branch, Horn Lake, or Hernando requires a building permit, must maintain minimum off-street parking ratios (typically 2 spaces per dwelling), and must meet IRC habitable-room standards for insulation, egress, ceiling height, and electrical. Flood zone properties near the Coldwater River or Horn Lake face additional elevation requirements under FEMA NFIP rules.
DeSoto County requires a building permit for all carports. 5-foot side setback, 25-foot front setback, 15-foot max height, counts toward 30% lot coverage. HOAs may restrict.
DeSoto County permits tiny homes on foundation as dwellings meeting IRC Appendix Q (400 sq ft minimum not required in Appendix Q). Tiny homes on wheels classified as RVs — only in approved RV parks.
4 cities in Desoto County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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