Philadelphia
Philadelphia ADU screening starts with the official zoning checklist, Atlas zoning tab, and L&I permit path.
HighOfficial source path
Pennsylvania
Pennsylvania ADUAllowed checks.
Use a connected city page or enter an address. Official local sources remain final.
Quick answer
Pennsylvania ADUAllowed coverage starts with local official sources and connected city pages.
State source posture
Local official sources
A useful ADU answer needs parcel facts: zoning, building type, unit count, lot constraints, utilities, and local ADU rules.
Pittsburgh
Use Pittsburgh zoning and OneStopPGH sources to verify accessory-dwelling-unit or secondary-unit eligibility and permit path.
HighOfficial source path
Allentown
Allentown, PA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.
HighOfficial source path
Reading
Reading, PA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.
HighOfficial source path
Erie
Erie, PA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.
HighOfficial source path
Bethlehem
Bethlehem, PA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.
HighOfficial source path
Scranton
Scranton, PA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.
HighOfficial source path
Lancaster
Lancaster, PA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.
HighOfficial source path
Harrisburg
Harrisburg, PA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.
HighOfficial source path
York
York, PA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.
HighOfficial source path
Wilkes-Barre
Wilkes-Barre, PA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.
HighOfficial source path
Altoona
Altoona, PA ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.
HighOfficial source path
Cite this page
Use this page as a public web reference, not an official agency record. The linked official source remains the final authority.
ADUAllowed. "Pennsylvania ADUAllowed | Official Source Routes". https://www.aduallowed.com/states/pa/. Reviewed Jul 2026.
Source and citation notes