Biddeford, Maine has excellent rules for accessory dwelling units with few restrictions.
Read MoreWestbrook, Maine allows an attached ADUs on property with a maximum of 800 sq ft.
Read MorePortland 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.
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