Connecticut residential & ADU permit data
As-of-right ADUs — where towns haven't opted out
Housing law
Connecticut's Public Act 21-29 (2021) makes accessory dwelling units permitted as-of-right in single-family zones, but let municipalities opt out by a two-thirds vote — and a majority of towns did, so whether an ADU is as-of-right depends heavily on the specific town.
Connecticut has no statewide 'missing middle' zoning law in force; a 2025 omnibus housing bill (HB 5002) with transit-oriented and middle-housing provisions was vetoed, leaving density to local zoning.
Jurisdictions we cover
Why Igni for Connecticut
Map which towns kept as-of-right ADUs versus those that opted out
Track ADU permit activity across the as-of-right municipalities
Live Hartford permit data, sourced from official open data
Start tracking Connecticut permits
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Sourced live from the City of Hartford open data (building permits; public domain / CC0).
Informational only, not legal advice. Housing law changes — verify current statutes before relying on this.