5 county-level rules, plus city-specific rules for 1 city in Philadelphia County, Pennsylvania.
Verified from official government sources
Philadelphia County allows accessory dwelling units (ADUs) in certain residential zoning districts under the Zoning Code. Some RSA (single-family) districts permit them by right or special exception. Building permits required. No PA state ADU mandate exists.
Philadelphia County requires zoning review for sheds but exempts structures under 100 sq ft from building permits. Setbacks typically 3 feet from side and rear property lines in residential districts. Max height 15 feet under Zoning Code Section 14-604.
Philadelphia County requires full building permits and zoning approval for garage conversions to habitable space. Must meet Philadelphia Building Code egress, ventilation, insulation, and ceiling height requirements. Parking replacement may be required.
Philadelphia County regulates carports as accessory structures under Zoning Code Section 14-604. Typically permitted in rear and side yards with setback requirements. Building permit required for permanent structures. Front-yard carports generally prohibited in residential zones.
Philadelphia County does not have tiny home specific zoning. Tiny homes on permanent foundations must meet full Philadelphia Building Code standards. Tiny homes on wheels are treated as RVs and cannot be used as permanent residences on residential lots.
1 cities in Philadelphia County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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Philadelphia County Ordinance Hub →