Rules by State
/ Maine
Maine ME ADU Rules
Last updated: April 2025 · Reviewed by ADU Journal editorial team
ADU Friendliness Score
50
★ Moderate
Size & Dimensions
Max ADU Size (Detached)
Determined locally
Max ADU Size (Attached)
Determined locally
Min ADU Size
Determined locally
JADU Max Size
Not recognized statewide
Max Height (Detached)
Determined locally
Stories Allowed
Determined locally
Setbacks & Lot Coverage
Rear Setback
Determined locally
Side Setback
Determined locally
Front Setback
Determined locally
Minimum Lot Size
Determined locally
Fire Sprinklers
Determined locally
Owner Occupancy & Rental Rules
Owner Occupancy Required?
No
Short-Term Rental (Airbnb)
Varies by city
Rental Income Allowed?
Yes
ADUs Per Lot
Determined locally
No owner occupancy required
Permitting Process
Review Timeline (Ministerial)
Determined locally
Permit Fees
Determined locally
Design Review Required?
No
Preapproved Plans Available?
No statewide program