ADU Construction in Belmont MA — In-Law Suites, Garage Conversions & More
Boston Smart Plastering builds accessory dwelling units throughout Belmont, MA. Belmont is a highly desirable inner suburb 6 miles west of Boston — an affluent community known for its substantial historic homes, strong school system, and active high-end renovation market. Boston Smart Plastering regularly works throughout Belmont on plaster restoration, premium interior renovations, and exterior projects. Whether you want a basement apartment, garage conversion, attached in-law suite, or detached backyard cottage, we manage every phase from permits to final finishes.
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ADUs are one of the smartest investments Belmont homeowners can make. Belmont's housing stock features substantial early 20th century single-family homes throughout Belmont Hill and the town center, along with mid-century construction in the flats. The town's older homes — many with original plaster walls and dated kitchens and bathrooms — represent an ideal fit for Boston Smart Plastering's expertise in both traditional craftsmanship and modern renovation. Under Massachusetts ADU law, most single-family properties in Middlesex County can now add an ADU by-right. Boston Smart Plastering handles the full build — design, permitting, construction, and Certificate of Occupancy. Belmont is 6 miles west of Boston, directly adjacent to Cambridge and Watertown, one of our most accessible Middlesex County communities.
Frequently asked questions
How much does it cost to build an ADU in Belmont MA?
ADU costs in Belmont vary by type. A basement conversion typically runs $80,000–$150,000. A detached cottage can cost $180,000–$350,000+. We provide a detailed estimate after visiting your Belmont property.
Do I need a permit for an ADU in Belmont MA?
Yes — all ADU construction requires building permits. Under the 2024 Massachusetts ADU law, most Belmont properties can add an ADU by-right. We handle all permit applications for Middlesex County on your behalf.