Belfast, Maine

Belfast, ME Accessory Dwelling Unit (ADU) Rules

City Acceptance Rating: 10/10

Last Updated: 6.24.2024

What You Need To Know

Both attached and detached ADUs are allowed in Belfast.  

Type of ADU Permit Required

A building permit is required in Belfast for ADUs.

ADU Rules

  1. ADUs are limited to a two bedroom maximum and are limited to 800 square feet or 75% of the square footage, whichever is less.

  2. An ADU within a detached accessory structure is still limited to no greater than 800 square feet.

    1. A structure of this type is limited to attached open structures, such as a deck, that are no more than 200 square feet. 

  3. Adequate capacity for sewer must be provided.

  4. There can only be one two way driveway or two one way driveways, but there cannot be separate driveways for the principal dwelling and ADU.  

  5. If the home is on a road with a posted speed limit of 40 mph or greater, a turnaround must be constructed.

Resources:

https://www.cityofbelfast.org/DocumentCenter/View/5693/Draft-Chap-102-ADU-Standards?bidId=

Detached ADU, Attached ADU, Convert Existing SpaceChris LeeFriendliness Score: 10/10, Belfast, Maine, North of Portland