ADUs are allowed in Willistown Township (Chester)Types:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Willistown Township (Chester), PA
Is your property eligible for an ADU?
# of Properties
4,168
Owner-occupied
90%
Zoning districts
12
Avg Home Value
$284,910
Median Lot Size
0.35 acres
Avg Income
$189,161
Residential Types:
4,168 housing units
Other
100%
Zoning Districts:
4,651 parcels · 12 districts
RU
24%(1,098)
R-3
23%(1,072)
RA
20%(922)
R-1
16%(748)
Other
17%(811)
ADU Rules
What can you build in Willistown Township (Chester), PA?
Willistown Township (Chester), 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: Conditional Use Permit
Owner Occupancy
- –Owner must reside on the premises during ADU occupancy.
Parking
- –2 spaces per ADU; garages or driveway spaces may count toward off-street parking if not blocking garage access; spaces must be on the same lot and within 400 ft of the building; up to 20% reduction may be approved with Planning Commission recommendation and a parking reserve area to meet full requirements if needed.
Rental Restrictions
- –Attached ADU rental prohibited; no short-term or long-term rentals.
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.
Chester County
Charlestown Township (Chester)East Bradford Township (Chester)East Brandywine Township (Chester)East Caln Township (Chester)East Goshen Township (Chester)East Marlborough Township (Chester)East Nottingham Township (Chester)Easttown Township (Chester)East Vincent Township (Chester)East Whiteland Township (Chester)Kennett Township (Chester)Lower Oxford Township (Chester)New Garden Township (Chester)New London Township (Chester)Schuylkill Township (Chester)Tredyffrin Township (Chester)Upper Uwchlan Township (Chester)Uwchlan Township (Chester)West Caln Township (Chester)West Chester Borough (Chester)West Fallowfield Township (Chester)West Goshen Township (Chester)West Pikeland Township (Chester)West Sadsbury Township (Chester)