ADUs are allowed in HopkintonTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Hopkinton, RI
Is your property eligible for an ADU?
# of Properties
3,347
Owner-occupied
100%
Zoning districts
13
Avg Home Value
$340,966
Median Lot Size
1.35 acres
Avg Income
$94,185
Residential Types:
3,347 housing units
Single Family
84%
2-3 Family
4%
Apts (4+ units)
1%
Other
11%
Zoning Districts:
3,847 parcels · 13 districts
RFR80
66%(2,525)
R-1
29%(1,130)
NB
1%(56)
MFG
1%(52)
Other
2%(84)
ADU Rules
What can you build in Hopkinton, RI?
Hopkinton, RI 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
Detached ADU Size Limits
- –Maximum size is the lesser of 25% of the primary residence's total floor area or 900 sq ft.
Max Units
- –1 ADU per residential lot
Owner Occupancy
- –Owner occupancy required; ADU occupants limited to owner or family.
Parking
- –1 off-street space/ADU; no new parking on street-facing side
Rental Restrictions
- –Short-term rentals prohibited; ADUs cannot be advertised/marketed for public rental.
- –Occupancy limited to owner/family—no rentals to non-family/third parties.
ADU State Law
What can you build in Rhode Island?
- –On an owner-occupied property as a reasonable accommodation for family members with disabilities;
- –On a lot with a total lot area of twenty thousand square feet (20,000 sq. ft.) or more for which the primary use is residential;
- –Where the proposed ADU is located within the existing footprint of the primary structure or existing accessory attached or detached structure and does not expand the footprint of the structure.
- –Subject to applicable dimensional requirements of the municipality
- –As per §45-24-38 of the RI Zoning Enabling Act, if an existing lot is smaller than the minimum lot size required by zoning, its setback requirements are reduced in proportion to the lot's size, and its maximum lot coverage is increased by the inverse proportion.
- –One ADU per lot
- –No short term rentals
- –Studio or 1 bedroom ADU may be up to 900 sq ft or 60% of the Gross Floor Area of the principal dwelling, whichever is less
- –2 bedroom ADU may be up to 1200 sq ft or 60% of the Gross Floor Area of the principal dwelling, whichever is less
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 Rhode Island municipalities
Rules change at the town line. Check the municipality your property is actually in.
Washington County