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ADUs are allowed in Pittsburgh
Types:DetachedInternal

Accessory Dwelling Unit (ADU) Rules for Pittsburgh, PA

Is your property eligible for an ADU?

# of Properties
123,169
Owner-occupied
54%
Zoning districts
77
Avg Home Value
$127,221
Median Lot Size
0.07 acres
Avg Income
$72,685
Residential Types:
123,169 housing units
Single Family
66%
2-3 Family
8%
Apts (4+ units)
4%
Condos
4%
Other
17%
Zoning Districts:
142,681 parcels · 77 districts
R1D-H
14%(20,004)
R1D-L
14%(19,550)
R1D-M
10%(14,476)
R2-L
9%(12,150)
Other
54%(76,501)

ADU Rules

What can you build in Pittsburgh, PA?

Pittsburgh, PA follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.

Interior / Attached ADU Size Limits

  • –Maximum size of 800 sq ft for an internal or attached accessory dwelling unit; no larger size allowed by special permit.

Detached ADU Size Limits

  • –Maximum size smaller than 800 sq ft

Owner Occupancy

  • –The owner must reside on site.

Parking

  • –0 spaces minimum; max not specified (exempt from Section 914 maxima); exemptions apply in ADU Overlay Districts; ADUs limited to structures with ≤1 dwelling

Rental Restrictions

  • –30-day minimum rental term; no leases under 30 days (applies to all ADU configurations).

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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Is your property eligible for an ADU?

ADU rules in other Pennsylvania municipalities

Rules change at the town line. Check the municipality your property is actually in.

Allegheny County

Aleppo Township (Allegheny)Baldwin Borough (Allegheny)Bell Acres BoroughBethel Park Borough (Allegheny)Bridgeville Borough (Allegheny)Carnegie Borough (Allegheny)Castle Shannon Borough (Allegheny)Crafton Borough (Allegheny)Duquesne City (Allegheny)Findlay Township (Allegheny)Fox Chapel Borough (Allegheny)Franklin Park Borough (Allegheny)Hampton Township (Allegheny)Kennedy Township (Allegheny)Marshall Township (Allegheny)McCandless Township (Allegheny)Monroeville Borough (Allegheny)Moon Township (Allegheny)Mt Lebanon Township (Allegheny)Oakmont Borough (Allegheny)Ohio Township (Allegheny)Penn Hills Township (Allegheny)Robinson Township (Allegheny)Rosslyn Farms Borough (Allegheny)
See all municipalities in Allegheny County →See all Pennsylvania municipalities →
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