ADU Rules in Philadelphia, PA — 2026 Guide
Check if your Philadelphia property qualifies for an ADU in 20 seconds
Philadelphia ADU Rules at a Glance
Philadelphia has limited ADU support. Here is what you need to know.
- Philadelphia does not have a dedicated ADU ordinance as of 2026.
- Accessory structures may be permitted via zoning variance on a case-by-case basis.
- Internal conversions (e.g., basement apartments) may be possible in certain zones.
- PA HB 1582 (proposed) would create a statewide ADU framework if passed.
What ReadyPermit Checks for Philadelphia Properties
Enter any Philadelphia address and get an instant ADU feasibility analysis covering:
Zoning Compliance
Verify your Philadelphia lot is zoned for ADU construction under current PA and local rules.
Setbacks & Coverage
Check required setbacks, lot coverage limits, and height restrictions for your specific parcel.
ADU Size Limits
Calculate the maximum ADU square footage allowed based on your lot size and primary dwelling.
Permit Requirements
Understand what permits and approvals Philadelphia requires before you can break ground.
Flood & Hazard Zones
Identify if your property falls in a flood zone, fire zone, or other hazard overlay.
Lot & Parcel Data
Pull parcel boundaries, lot dimensions, and existing structures from county records.
Check Your Philadelphia Property Free
Enter your address below. In under 20 seconds you will know if your Philadelphia lot qualifies for an ADU — no phone calls, no waiting.
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