ADU Construction in Arlington MA — In-Law Suites, Garage Conversions & More
Boston Smart Plastering builds accessory dwelling units throughout Arlington, MA. Arlington is a thriving inner suburb 6 miles northwest of Boston — a dense, walkable community with an active renovation market driven by its stock of early 20th century single-family homes, multi-families, and Victorians. Boston Smart Plastering serves Arlington homeowners across all trades with particular expertise in the town's older housing stock. 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 Arlington homeowners can make. Arlington's housing is predominantly early 20th century — Colonials, Craftsman bungalows, two-families, and triple-deckers throughout Arlington Center, East Arlington, and Arlington Heights. These older properties are prime candidates for plaster restoration, kitchen and bathroom renovation, insulation upgrades, and exterior work. 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. Arlington is 6 miles northwest of Boston, directly adjacent to Cambridge and Lexington, easily accessible and a core part of our Middlesex County service footprint.
Frequently asked questions
How much does it cost to build an ADU in Arlington MA?
ADU costs in Arlington 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 Arlington property.
Do I need a permit for an ADU in Arlington MA?
Yes — all ADU construction requires building permits. Under the 2024 Massachusetts ADU law, most Arlington properties can add an ADU by-right. We handle all permit applications for Middlesex County on your behalf.