Across the Boarder: Understanding Accessory Dwelling Units in Connecticut

In Connecticut, state law mandates that all towns and cities must allow accessory dwelling units (ADUs), either by right or through a special permit. However, each municipality has the flexibility to set its own regulations and restrictions regarding ADUs. This means that while some towns fully embrace ADUs, others may impose stricter guidelines—or even not allow them at all.

There are various reasons why certain towns may hesitate to permit ADUs. One common concern is the perceived impact on the character of a neighborhood. Some residents worry that ADUs could alter the community’s feel or lower property values. Other issues may include potential increases in traffic, parking difficulties, or overcrowding.

Additionally, some towns have not yet updated their zoning regulations to align with the state’s ADU laws. In other cases, the local government may lack the resources or expertise to manage the application process, which can be time-consuming and requires detailed knowledge of zoning and building regulations.

It’s important to recognize the benefits ADUs bring, especially in addressing the affordable housing crisis and offering homeowners flexible living solutions. However, each town must balance these advantages with the concerns they may have about implementing ADU regulations.

Here are some Connecticut towns and cities that currently allow ADUs:

  • Avon
  • Bethany
  • Bethel
  • Bloomfield
  • Bolton
  • Branford
  • Bristol
  • Brookfield
  • Canton
  • Chaplin
  • Chester
  • Clinton
  • Colchester
  • Coventry
  • Cromwell
  • Danbury
  • Durham
  • East Haddam
  • East Hampton
  • East Windsor
  • Ellington
  • Essex
  • Farmington
  • Franklin
  • Glastonbury
  • Granby
  • Groton
  • Guilford
  • Haddam
  • Hamden
  • Hartford
  • Hebron
  • Killingworth
  • Lebanon
  • Ledyard
  • Madison
  • Manchester
  • Mansfield
  • Marlborough
  • Meriden
  • Middlebury
  • Middletown
  • Milford
  • Monroe
  • Montville
  • Naugatuck
  • New Canaan
  • New Fairfield
  • New Hartford
  • New London
  • New Milford
  • Newington
  • Newtown
  • North Branford
  • North Haven
  • Norwalk
  • Old Lyme
  • Old Saybrook
  • Orange
  • Oxford
  • Plainfield
  • Plainville
  • Plymouth
  • Pomfret
  • Portland
  • Prospect
  • Putnam
  • Redding
  • Ridgefield
  • Rocky Hill
  • Salem
  • Scotland
  • Seymour
  • Shelton
  • Somers
  • South Windsor
  • Sprague
  • Stafford
  • Stamford
  • Sterling
  • Stonington
  • Suffield
  • Thomaston
  • Tolland
  • Trumbull
  • Union
  • Vernon
  • Voluntown
  • Wallingford
  • Waterbury
  • Waterford
  • West Hartford
  • Westbrook
  • Weston
  • Westport
  • Willington
  • Wilton
  • Windsor
  • Windsor Locks
  • Wolcott
  • Woodbridge

This list isn’t exhaustive, and regulations can change. If you’re considering building an ADU in Connecticut, it’s always a good idea to check with your local zoning department to confirm that ADUs are allowed in your area and to review any specific guidelines or requirements they may have.


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