Philadelphia's Department of Licenses & Inspections (L&I) issues all building permits within city limits. The city publishes its full L&I Permits dataset on OpenDataPhilly — over 900,000 records searchable by address, permit number, and permit type. Records cover new construction, residential renovations, demolitions, electrical, plumbing, and commercial fitouts across all 10 city council districts and 65 neighborhoods. Philadelphia's permit history is especially dense in its row-house stock: the city has more than 60,000 occupied rowhomes, and L&I records often reveal decades of incremental work — rear additions, basement conversions, and rooftop ADUs. L&I's online portal (li.phila.gov) is notoriously difficult to search by address across time; PermitReport queries the open-data API directly for complete history.
L&I issued permits from OpenDataPhilly open data: residential renovations, commercial fitouts, new construction, demolition, electrical, plumbing, and mechanical. Includes permit number, issue date, declared cost, permit type, and status.
Source: Philadelphia Licenses & Inspections (L&I) https://li.phila.gov
Suburban townships (Lower Merion, Radnor, Cheltenham — separate jurisdictions); permits still in active review; pre-database paper records (generally pre-1990).
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