Portland, Maine

Portland Maine allows two ADUs on any residential property! A single ADU can be up to 2/3 the size of the primary dwelling unit, or the size of two ADU can be equal to the size of the primary dwelling.

After updating its ADU rules in 2021, Portland has one of the most lenient ADU rules in New England. The rules provide great opportunities to add housing for families or generate rental income in Portland's booming rental market.

Attached ADU, Convert Existing Space, Detached ADUChris LeeNovember 6, 2021Friendliness Score: 10/10, Portland, Maine, Greater Portland