ADUs are allowed in Monroeville Borough (Allegheny)Types:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Monroeville Borough (Allegheny), PA
Is your property eligible for an ADU?
# of Properties
10,786
Owner-occupied
83%
Zoning districts
16
Avg Home Value
$143,195
Median Lot Size
0.24 acres
Avg Income
$89,831
Residential Types:
10,786 housing units
Single Family
87%
2-3 Family
1%
Condos
3%
Other
9%
Zoning Districts:
11,687 parcels · 16 districts
R-2
66%(7,668)
R-1
13%(1,572)
R-3
5%(624)
S
5%(604)
Other
10%(1,219)
ADU Rules
What can you build in Monroeville Borough (Allegheny), PA?
Monroeville 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: Special Permit
- –Detached ADU: Special Permit
Interior / Attached ADU Size Limits
- –Maximum size of 625 sq ft per story (up to two stories)
Detached ADU Size Limits
- –Maximum size of 625 sq ft per story, up to two stories (maximum 1,250 sq ft total).
Owner Occupancy
- –Owner-occupancy not required.
Rental Restrictions
- –Detached ADU: Short-Term Rentals allowed only where STR standards apply; not permitted in R-1/R-2 (allowed by special exception in R-3/R-4/C-3/BLVD) with limits: one per structure, 1,500 ft separation, annual permit, parking, safety checklist.
- –Attached ADU: Short-Term Rentals prohibited because STR cannot be located in a structure that contains one or more dwelling units; Long-Term Rentals: no explicit prohibition.
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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