ADU rules for Castle Shannon Borough (Allegheny)
Accessory Dwelling Unit (ADU) Rules for Castle Shannon Borough (Allegheny), PA
Is your property eligible for an ADU?
# of Properties
3,079
Owner-occupied
80%
Zoning districts
11
Avg Home Value
$117,935
Median Lot Size
0.15 acres
Avg Income
$72,698
Residential Types:
3,079 housing units
Single Family
82%
2-3 Family
4%
Apts (4+ units)
3%
Condos
7%
Other
5%
Zoning Districts:
3,377 parcels · 11 districts
R-1
74%(2,514)
R-3
13%(443)
C-1
6%(207)
R-2
3%(90)
Other
4%(123)
ADU Rules
What can you build in Castle Shannon Borough (Allegheny), PA?
Castle Shannon Borough (Allegheny), PA follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Not addressed in the local bylaw
- –Detached ADU: Not addressed in the local bylaw
ADU State Law
What can you build in Pennsylvania?
- –Pennsylvania does not have a statewide ADU mandate; ADU rules are set by individual municipalities.
- –Building/fire codes are set statewide, but whether an ADU is allowed is local zoning.
What's allowed on your lot?
These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.
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ADU rules in other Pennsylvania municipalities
Rules change at the town line. Check the municipality your property is actually in.
Allegheny County
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