Building permits, zoning and septic rules in Philadelphia County, Pennsylvania

Yes. Philadelphia County requires a building permit for new buildings and many enlargements, additions, alterations, demolitions, occupancy changes, major repairs and projects disturbing at least 5,000 square feet of earth¹. Regular maintenance and specified minor work may be exempt when the property is not on the Philadelphia Historic Registry, but most projects need a zoning permit before the building-permit application¹. Beginning July 1, 2026, Philadelphia uses the 2021 family of International Code Council codes with local amendments¹¹. Properties in a Special Flood Hazard Area or floodplain must submit flood protection forms with every zoning or building permit application¹⁰.

The Philadelphia Department of Licenses and Inspections is the building department for Philadelphia County and also handles zoning, licensing and code enforcement¹². Reach L&I through 311 or at (215) 686-8686, or visit 1401 John F. Kennedy Blvd., 11th Floor, Philadelphia, PA 19102¹². Building-permit applications may be filed online through eCLIPSE or in person by appointment at the Permit and License Center¹. Depending on the project, L&I may require pre-approvals from the Water Department, Department of Public Health, Planning Commission, Fire Department, Historical Commission, Streets Department, or Parks and Recreation¹. Construction and repair work must receive the inspections identified on the permit, and successful completion leads to a Certificate of Approval^6,7. Certificate-of-occupancy paperwork carries a $100 filing fee and a $253 permit fee per building or space that needs its own certificate, plus surcharges⁹.

Yes. Philadelphia County and the City of Philadelphia are coterminous, and the Philadelphia Zoning Code regulates development and changes of use throughout the city². L&I issues zoning and change-of-use approvals under that code². Start with the parcel's base district and overlays, because allowed uses, height, bulk and setbacks are not one countywide standard^4,13. In the RM-1 through RM-4 residential districts the minimum lot area runs from 1,440 square feet in RM-1 to 15,000 square feet in RM-2, 10,000 in RM-3 and 2,500 in RM-4; the RMX-1 and RMX-2 districts have minimum district areas of 2 acres and 1 acre^13,14. The published quick guide is a general aid rather than a substitute for the adopted code⁴. We could not confirm a single countywide minimum dwelling size, countywide minimum lot size, lot-coverage rule or accessory-dwelling answer; ask L&I about the exact parcel and proposal¹².

Most of Philadelphia is served by municipal sewer, but some areas do not have City sewer lines³. A property owner without City sewer access must request a permit to install or repair a septic system and must coordinate the work with the Philadelphia Department of Public Health³. The septic permit costs $500 per location³. Where public infrastructure is available, Philadelphia Water Department permits are required to install or repair a water service or sewer lateral between its infrastructure and the property¹⁵. The soil survey estimates that 68.8% of county soils do not have severe limitations for a conventional drain field, but that countywide measure does not replace site evaluation or Public Health approval^3,16.

We could not confirm a Philadelphia rule that generally allows residential occupancy of an RV or tiny home on a private lot. The Philadelphia Zoning Code regulates development and changes of use countywide, while permitted uses and dimensional standards depend on the parcel's district and overlays^2,4. Ask L&I whether the proposed structure or vehicle, residential use, duration and utility plan are allowed before buying or placing it on the property¹². A manufactured home built to federal standards receives limited treatment under Pennsylvania's construction code, but relocation, additions, later alterations, utility work and grading can trigger construction-code requirements¹⁷. That construction rule does not establish that Philadelphia zoning permits the home on a particular lot^2,17.

1. Identify the parcel's zoning district and overlays, then confirm the proposed use and dimensional standards with L&I^4,12.
2. Determine whether zoning approval, flood protection forms or agency pre-approvals are required before filing the building application^1,18.
3. Apply online through eCLIPSE or in person by appointment at the Permit and License Center¹.
4. Use licensed contractors for plumbing, electrical and fire-suppression work; the owner-occupant exception covers only emergency repairs to a one- or two-family home, which must be reported and legalized by permit within 3 business days⁵.
5. Schedule every inspection identified on the permit and obtain the Certificate of Approval after successful completion⁷.
6. Confirm whether the project requires a certificate of occupancy; an existing one- or two-family home with unchanged use generally does not⁹.
7. Arrange the applicable public water and sewer connection permits, or obtain Public Health approval for septic work where City sewer is unavailable^3,15.

Check the parcel's base district, overlays and permitted use before estimating buildable area, because Philadelphia's height, bulk and setback standards vary by zoning district^4,13. Compare the intended occupancy and existing structures with City records, since a change of occupancy can require a building permit and certificate of occupancy^1,8. Determine whether the parcel is in a Special Flood Hazard Area, where flood protection documents must accompany permit applications¹⁰. Confirm sewer availability and do not assume an on-lot system is possible without a Department of Public Health permit³. If access affects state highway land or a PennDOT drainage facility, obtain a PennDOT Highway Occupancy Permit¹⁹.