ADUs are allowed in GranbyTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Granby, CT
Is your property eligible for an ADU?
# of Properties
4,052
Owner-occupied
91%
Zoning districts
15
Avg Home Value
$266,235
Median Lot Size
1.00 acres
Avg Income
$132,717
Residential Types:
4,052 housing units
Single Family
91%
2-3 Family
1%
Apts (4+ units)
1%
Other
8%
Zoning Districts:
5,238 parcels · 15 districts
R30
35%(1,839)
R2A
32%(1,692)
R50
17%(894)
CE
4%(186)
Other
12%(627)
ADU Rules
What can you build in Granby, CT?
Granby, CT 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: Special Permit
Interior / Attached ADU Size Limits
- –Maximum size of 1,200 sq ft (by right)
- –Maximum size of 40% of the principal dwelling’s gross floor area (Special Permit)
Detached ADU Size Limits
- –Maximum size of 1,200 sq ft for a detached accessory dwelling unit.
- –With a special permit, the maximum may be up to 40% of the home's gross floor area.
Max Units
- –1 ADU per single-family lot
- –Attached or detached (detached requires Special Permit), not both
Owner Occupancy
- –Owner must occupy the other unit; only one unit may be rented.
Parking
- –3 off-street spaces required for the primary building and attached apartment; applies to attached ADUs on conforming lots in R30, R50, R2A, R4A, Granby Center Edge, and Granby Center Commons; no ADU-specific reductions or waivers.
Rental Restrictions
- –Only one of the two dwellings on the lot may be rented; the other must be owner-occupied.
ADU State Law
What can you build in Connecticut?
- –Connecticut Public Act 21-29 (now CGS § 8-2o) established statewide ADU rules.
- –115 municipalities opted out of the state ADU provisions. In those towns, ADUs may still be allowed, but they are regulated solely under local zoning bylaws.
- –54 municipalities did not opt out and are subject to the state's default ADU standards. Local bylaws in these towns must allow at least the minimums required by state law.
- –At least one accessory apartment must be allowed as of right on any lot with a single-family home.
- –Towns must allow an ADU to be at least the lesser of 1,000 sq ft or 30% of the principal dwelling's Net Floor Area.
- –Setbacks, lot size, building frontage, lot coverage, height, and design requirements cannot be more restrictive than those applied to the principal dwelling.
- –Only one parking space can be required per ADU.
- –A passageway between units
- –A separate exterior entrance (unless required by code)
- –A relationship (e.g. familial or employment) between occupants
- –Age minimums for ADU tenants
- –Separate utility billing
- –Periodic permit renewals
- –Owner-occupancy is not required under state law, but towns may impose it.
- –Towns may regulate short-term rentals.
- –Requirements for wells or private sewerage systems still apply, but approval cannot be unreasonably withheld.
- –Towns may not condition ADU approval on fixing unrelated nonconformities on the lot.
- –No new utility connection fees may be charged unless the ADU is built with a new principal dwelling.
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 Connecticut municipalities
Rules change at the town line. Check the municipality your property is actually in.
Capitol County