Maine's LD 2003 Law makes it easier than ever to add an ADU.Learn the new rules
Maine ADU Guide & Resources
Everything you need to know about the regulatory and financial reality of building an ADU in Maine.
2026 ADU Pricing Guide
Download our comprehensive PDF breaking down the exact costs of permits, site prep, and MUBEC compliance in Maine.
Download GuideWhat is Maine's LD 2003 Law?
Passed in 2022 to address the state's housing shortage, LD 2003 mandates that municipalities allow at least one Accessory Dwelling Unit (ADU) on single-family lots, effectively removing restrictive zoning barriers that previously blocked homeowners from maximizing their property.
Maine Rental ROI Profile
A $65,000 all-in investment in an ADU 240 can amortize incredibly fast depending on your location.
Portland Market (Long Term)
$1,600/moEstimated Yield
Coastal Market (Short Term / Airbnb)
$8,500/seasonEstimated Yield