ADU Construction in Weymouth MA — In-Law Suites, Garage Conversions & More
Boston Smart Plastering builds accessory dwelling units throughout Weymouth, MA. Weymouth is a large South Shore suburb 12 miles south of Boston with a strong mix of older single-family homes and newer developments. Boston Smart Plastering regularly serves Weymouth homeowners across all trades — from plastering and painting in older neighborhoods to new construction finishing in developing areas. 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 Weymouth homeowners can make. Weymouth's housing ranges from 1920s–1950s capes and colonials in South Weymouth and Weymouth Landing to newer subdivisions near Route 3. Many older homes have original plaster walls that need careful repair and skim coating. Roofing and siding replacement is particularly active given the town's aging housing stock. Under Massachusetts ADU law, most single-family properties in Norfolk County can now add an ADU by-right. Boston Smart Plastering handles the full build — design, permitting, construction, and Certificate of Occupancy. Weymouth is 12 miles south of Boston off Route 3, easily accessible and one of our most active South Shore service communities.
Frequently asked questions
How much does it cost to build an ADU in Weymouth MA?
ADU costs in Weymouth 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 Weymouth property.
Do I need a permit for an ADU in Weymouth MA?
Yes — all ADU construction requires building permits. Under the 2024 Massachusetts ADU law, most Weymouth properties can add an ADU by-right. We handle all permit applications for Norfolk County on your behalf.