Mass ADU

Mass ADU is a Woburn company built specifically around accessory dwelling units — detached units, attached additions, garage and basement conversions, and prefab models — handling design, permitting, and construction for homeowners across Massachusetts. It's a young business: BBB's file shows it started in August 2024, with Leah McCann, its president, listed as the sole employee. Its Massachusetts home improvement contractor license (#214010) is active and registry-verified, and BBB separately lists a construction supervisor license (CS-091636) on file, both with expiration dates in late 2026 and early 2027. BuildZoom independently verified the same license as active and scores the company in the top 27% of Massachusetts licensed contractors. The one review on record, from late 2025, describes the early stages of a project: Leah spending significant time walking a homeowner through the process and getting the permitting phase moving, with the reviewer calling the group easy to work with and looking forward to construction. For a homeowner considering an ADU — a project with its own permitting and zoning complexity — Mass ADU's specialization and clean licensing record make it worth a call; confirm current project timelines directly given the company's recent start.