ADU rules in Philadelphia, PA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Philadelphia ADUs are governed by Phila. Code §14-604(11). Limited to 800 sq ft, one per lot, allowed only in RSA-5/CMX-1 districts on lots ≥1,600 sq ft or in historic buildings. Owner must occupy the main unit or ADU. Zoning + Building permits required.
Phila. Code §14-604(11) allows ADUs only where the principal use is a detached or semi-detached single-family home, in RSA-5 or CMX-1 zoning districts on lots of at least 1,600 sq ft, or in any historic structure regardless of district. One ADU per lot. Maximum 800 sq ft floor area (no limit in historic structures). ADU must be within the principal building or an existing detached accessory structure. Only one additional street-facing entrance is permitted. Owner must occupy either the main dwelling or the ADU and must record an affidavit and deed restriction before the ADU is occupied. Multiple city council districts are currently exempt from these provisions or ban ADUs outright. Both Zoning Permit and Building Permit required.
Unpermitted ADU: L&I citation, stop-work order, potential demolition.
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