ADU Construction in Marshfield MA — In-Law Suites, Garage Conversions & More
Boston Smart Plastering builds accessory dwelling units throughout Marshfield, MA. Marshfield is a scenic coastal community on the South Shore 25 miles southeast of Boston — a desirable residential town known for its beaches, marshes, and active renovation market driven by seasonal and year-round homeowners. Boston Smart Plastering serves Marshfield homeowners across all trades including roofing, siding, and exterior work suited to the coastal New England climate. 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 Marshfield homeowners can make. Marshfield's housing ranges from older cape-style homes and cottages near the waterfront to newer construction throughout inland residential areas. The coastal location creates specific demand for exterior services — roofing and siding that handles salt air and coastal weather, power washing, and deck building — alongside interior renovation work in homes being updated for year-round occupancy. Under Massachusetts ADU law, most single-family properties in Plymouth County can now add an ADU by-right. Boston Smart Plastering handles the full build — design, permitting, construction, and Certificate of Occupancy. Marshfield is 25 miles southeast of Boston off Route 139 and Route 3, the southernmost community in our Plymouth County service area.
Frequently asked questions
How much does it cost to build an ADU in Marshfield MA?
ADU costs in Marshfield 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 Marshfield property.
Do I need a permit for an ADU in Marshfield MA?
Yes — all ADU construction requires building permits. Under the 2024 Massachusetts ADU law, most Marshfield properties can add an ADU by-right. We handle all permit applications for Plymouth County on your behalf.