Attached ADU in Maine
American Building Group
276 Canco Road, Portland, ME 04103
An ADU (Accessory Dwelling Unit) is an independent living space on a single-family property, complete with kitchen, bathroom & private entrance. Types include detached units, garage conversions & basement apartments. Ideal for rental income or family housing.
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Sensible Home Solutions
20 Banks Brook Road, Old Orchard Beach, ME 04064
Sensible Home Solutions builds ADUs, in-law suites & secondary living spaces across Maine, Massachusetts & New Hampshire. Services include detached units, garage conversions & basement ADUs. Free discovery call available.
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Guiding Builders
432 Elm Street, Portland, ME 04005
Guiding Builders specializes in ADU construction, offering design, permitting, and building services. Projects include detached ADUs, garage conversions, in-law suites, granny flats, and casitas—custom-built to add value and living space.
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Clifford Structures
Brunswick, ME 04011
Brunswick, Bath & Rockland homeowners can access the ADU Boost Pilot Program via MCOG and Bangor Savings Bank. Benefits include fixed-rate financing, up to $10K in grants, and expert support. Min. project cost: $50K. Long-term rentals only.
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JW Design Build
70 Cony Road, Chelsea, ME 04330
JW Design Build specializes in custom home renovations and additions, including master suites, kitchens, home offices, and outbuildings. Their integrated design-build approach guides homeowners from concept to completion without relocating.
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Hobart Contracting
112 Shore Road, Cape Neddick, ME 03902
At Hobart Contracting, we design and build high-quality Accessory Dwelling Units (ADUs) that fit your lifestyle and property. Whether you’re planning a guest house, in-law suite, rental unit, or private retreat, our team creates spaces that are functional, beautiful, and built to last.
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O’Brien Wood & Iron
142 Presumpscot Street, Portland, ME 04103
Portland, ME design-build firm O'Brien Wood & Iron has offered expert construction, renovation, historic restoration & custom millwork since 2008. With 60+ years combined experience, they serve residential & commercial clients with quality craftsmanship.
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Other cities in Maine
What you need to know
Searching for top Attached ADU ADU Contractors in Maine? Our directory highlights trusted local professionals who specialize in designing and building accessory dwelling units (ADUs).
Working with a qualified Attached ADU ADU Contractor in Maine ensures your ADU project meets local building codes, zoning laws, and permit requirements. Whether you're planning a detached ADU, garage conversion, or backyard cottage, experienced Attached ADU professionals can guide you through every step.
Maine homeowners are increasingly investing in ADUs to create additional living space, generate rental income, or support multigenerational living. The Attached ADU experts featured here bring local expertise and proven experience to help make your project a success.
Browse our listings to find the best Attached ADU ADU Contractors in Maine, and get started today.