Philadelphia permits ADUs under Title 14 (Zoning Code) where the underlying district allows. Most RSA-5 and RSD-3 rowhouse zones allow ADUs by right. Permits are processed through Licenses and Inspections. Lot size, setbacks, and building code compliance under Title 4 apply.
Philadelphia Title 14 Zoning Code regulates ADUs (Accessory Dwelling Units or in-law suites). RSA-5 and RSD-3 zones permit ADUs by-right subject to dimensional standards. ADUs in other zones may require zoning variance from the Zoning Board of Adjustment. The 2018 zoning code update expanded ADU rights but Philadelphia did not enact California-style preemption. Permits file through eCLIPSE, the L+I online portal. Required: zoning, building, electrical, plumbing, and mechanical permits. Plan review takes 15-30 business days. Maximum ADU size is 800 sq ft or 50 percent of primary dwelling. Setbacks follow the underlying zoning district. Historic district properties need Historical Commission review.
Unpermitted ADU construction violates Title 4 (PM Code) and Title 14 (Zoning). Penalties include stop-work orders, $500-$2,000 per day fines under Title 14-303, and possible structure removal orders. L+I may file liens on the property for unpaid fines.
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