Maine Zoning & Land Use Guide
Last updated: Verified:
Comprehensive guide to Maine zoning laws, building codes, and land use regulations.
Key Facts
- Building Code: Maine Uniform Building and Energy Code (MUBEC, based on 2021 IBC)
- State ADU Law: Yes — ADU-friendly
- ADU Details: Maine enacted LD 2003 in 2022, which requires municipalities to permit accessory dwelling units on any lot where single-family housing is allowed. The law prohibits municipal ordinances that restrict ADUs through owner-occupancy requirements, density limits that would exclude ADUs, or design standards that make construction infeasible.
Cities in Maine
Auburn
Pop.
ADU: Restricted
Augusta
Pop.
ADU: Restricted
Bangor
Pop.
ADU: Restricted
Bath
Pop.
ADU: Restricted
Belfast
Pop.
ADU: Restricted
Biddeford
Pop.
ADU: Restricted
Brewer
Pop.
ADU: Restricted
Caribou
Pop.
ADU: Restricted
Ellsworth
Pop.
ADU: Restricted
Gardiner
Pop.
ADU: Restricted
Lewiston
Pop.
ADU: Restricted
Old Town
Pop.
ADU: Restricted
Portland
Pop.
ADU: Restricted
Presque Isle
Pop.
ADU: Restricted
Rockland
Pop.
ADU: Restricted
Saco
Pop.
ADU: Restricted
Sanford
Pop.
ADU: Restricted
South Portland
Pop.
ADU: Restricted
Waterville
Pop.
ADU: Restricted
Westbrook
Pop.
ADU: Restricted
Disclaimer: The information on this website is provided for general informational purposes only and does not constitute legal, financial, or professional advice. Always verify current requirements with your local planning department.