ADU Town Regulations
Lewiston, ME
Apr 20, 2023
Last Updated
About
Lewiston is the second most populous city in the U.S. state of Maine, with the city's population at 37,121 as of the 2020 United States Census. The city lies halfway between Augusta, the state's capital, and Portland, the state's most populous city. Lewiston exerts a significant impact upon the diversity, religious variety, commerce, education, and economic power of Maine. It is known for having an overall low cost of living, substantial access to medical care, and a low violent-crime rate. In recent years, the city of Lewiston has also seen a spike in economic and social growth. While the dominant language spoken in the city is English, it is home to a significant Somali population as well as the largest French-speaking population in the United States (by population).
ADU Rules
ADUs may be attached or detached from the primary dwelling.
ADUs must be on the same parcel and be built on permanent foundations.
When an ADU is attached, the principal dwelling must have the only main entrance, and other entrances must appear subordinate.
No additional curb cuts are allowed, and the ADU must share the same driveway as the principal residence. Driveways may not be expanded to exceed 24 feet in width.
ADUs may not be greater than 900 square feet and are limited to two bedrooms and may not be less than 190 square feet.
Detached ADUs must be located to the side or rear of the primary dwelling.
The ADU or the primary dwelling must be occupied by the owner.
No additional parking is required for the ADU.
The ADU is subject to all fire safety and egress requirements.
ADUs on properties with private sewer must meet requirements for new or expanded systems.
The primary dwelling and ADU must remain under common ownership.