ADU rules for Londonderry Township (Dauphin)
Accessory Dwelling Unit (ADU) Rules for Londonderry Township (Dauphin), PA
Is your property eligible for an ADU?
# of Parcels
2,455
Zoning districts
10
Median Parcel Size
1.00 acres
Zoning Districts:
2,455 parcels · 10 districts
R-1
57%(1,388)
AG
30%(729)
C-2
8%(207)
R-2
4%(93)
Other
2%(38)
ADU Rules
What can you build in Londonderry Township (Dauphin), PA?
Londonderry Township (Dauphin), 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
Max Units
- –1 second dwelling unit per single-family detached dwelling; across the TND, no more than 5% of such dwellings may have a second unit; each second unit up to 1,200 sq ft and 2 bedrooms.
Owner Occupancy
- –No owner-occupancy requirement stated.
Parking
- –No ADU-specific min/max; general residential parking applies (two spaces per dwelling unit); TND allows up to 50% of required off-street parking via eligible on-street spaces within 200 ft; shared parking reductions may apply.
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.
Dauphin County
Derry Township (Dauphin)East Hanover Township (Dauphin)Gratz Borough (Dauphin)Harrisburg City (Dauphin)Highspire Borough (Dauphin)Hummelstown Borough (Dauphin)Lower Paxton Township (Dauphin)Lower Swatara Township (Dauphin)Middle Paxton Township (Dauphin)Royalton Borough (Dauphin)South Hanover Township (Dauphin)Susquehanna Township (Dauphin)Swatara Township (Dauphin)Unincorporated DauphinWashington Township (Dauphin)West Hanover Township (Dauphin)