ADU Construction in Somerville MA — In-Law Suites, Garage Conversions & More
Boston Smart Plastering builds accessory dwelling units throughout Somerville, MA. Somerville is a vibrant, densely populated urban city directly northwest of Boston with an incredibly active renovation market driven by its stock of Victorian triple-deckers, townhouses, and converted multi-families. Boston Smart Plastering regularly serves Somerville homeowners and property owners across all trades. 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 Somerville homeowners can make. Somerville's housing stock is predominantly late Victorian and early 20th century — triple-deckers, two-families, and rowhouses throughout neighborhoods like Davis Square, Union Square, and Winter Hill. These older properties have original plaster walls, aging mechanical systems, and kitchens and bathrooms that are prime candidates for 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. Somerville borders Cambridge and sits just 4 miles northwest of Downtown Boston — one of our most active and accessible inner-suburb service communities.
Frequently asked questions
How much does it cost to build an ADU in Somerville MA?
ADU costs in Somerville 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 Somerville property.
Do I need a permit for an ADU in Somerville MA?
Yes — all ADU construction requires building permits. Under the 2024 Massachusetts ADU law, most Somerville properties can add an ADU by-right. We handle all permit applications for Middlesex County on your behalf.