ADUs are allowed in Marlborough Township (Montgomery)Types:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Marlborough Township (Montgomery), PA
Is your property eligible for an ADU?
# of Properties
1,253
Owner-occupied
85%
Zoning districts
15
Avg Home Value
$144,658
Median Lot Size
1.12 acres
Avg Income
$105,912
Residential Types:
1,253 housing units
Single Family
83%
2-3 Family
1%
Apts (4+ units)
3%
Other
13%
Zoning Districts:
1,781 parcels · 15 districts
R-1
69%(1,229)
VC
10%(181)
MHD
9%(160)
VR
4%(75)
Other
8%(136)
ADU Rules
What can you build in Marlborough Township (Montgomery), PA?
Marlborough Township (Montgomery), PA follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: By Right
- –Detached ADU: By Right
Interior / Attached ADU Size Limits
- –Maximum gross floor area of 1,200 sq ft for an internal or attached ADU.
Detached ADU Size Limits
- –Maximum ADU size of 1,200 sq ft
- –ADU must be smaller than the principal dwelling unit
Max Units
- –1 ADU per lot on single-family lots ≥10 acres (Conservation Subdivision overlay). Outside the overlay: none specified.
Owner Occupancy
- –Owner-occupancy not required
Parking
- –2 spaces/ADU; no explicit max (CMU cap = 120% of min); ADUs treated as single-family under most-similar-use; up to 25% reserve parking reduction may be allowed with a reserved area.
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.
Montgomery County
Abington Township (Montgomery)Cheltenham Township (Montgomery)Douglass Township (Montgomery)East Norriton Township (Montgomery)Horsham Township (Montgomery)Limerick Township (Montgomery)Lower Merion Township (Montgomery)Lower Pottsgrove Township (Montgomery)Lower Providence Township (Montgomery)Norristown Borough (Montgomery)Plymouth Township (Montgomery)Pottstown Borough (Montgomery)Skippack Township (Montgomery)Souderton Borough (Montgomery)Trappe Borough (Montgomery)Upper Dublin Township (Montgomery)Upper Gwynedd Township (Montgomery)Upper Merion Township (Montgomery)Upper Moreland Township (Montgomery)West Norriton Township (Montgomery)Whitemarsh Township (Montgomery)Whitpain Township (Montgomery)