ADUs are allowed in HebronTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Hebron, CT
Is your property eligible for an ADU?
# of Properties
3,112
Owner-occupied
90%
Zoning districts
17
Avg Home Value
$222,765
Median Lot Size
1.49 acres
Avg Income
$140,316
Residential Types:
3,112 housing units
Other
100%
Zoning Districts:
4,575 parcels · 17 districts
R1
67%(3,071)
R2
12%(535)
AL
11%(494)
AP
5%(222)
Other
6%(253)
ADU Rules
What can you build in Hebron, CT?
Hebron, 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: By Right
Interior / Attached ADU Size Limits
- –Maximum ADU size of 35% of the principal dwelling’s total floor area
Detached ADU Size Limits
- –Maximum detached ADU size in R-1: 900 sq ft on lots up to 5 acres and 1,200 sq ft on larger lots; other districts have no fixed sq ft cap.
Max Units
- –1 ADU per single-family lot (attached/internal within the principal dwelling).
- –Detached ADUs: 0 per lot.
- –Two-family/multifamily lots: ADUs not permitted; JADUs: none specified.
Owner Occupancy
- –Owner must reside on premises; affidavit confirming owner-occupancy required.
Parking
- –1 off‑street space for ADU; total min 3 on lot (2 principal + 1 ADU); no max or waivers
Rental Restrictions
- –Short-term rentals treated as B&B; Special Permit required; owner-occupied while operating; max 7 consecutive nights per guest
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