ADU Size Limit: A Massachusetts Homeowner Guide
A protected-use ADU in Massachusetts may be up to 900 square feet or 50% of the principal dwelling's gross floor area, whichever is smaller, under the statewide rule effective January 31, 2025. A 1,400-square-foot main house, for example, may limit the ADU to 700 square feet, even though the statutory ceiling is 900 square feet. […]
400 Sq Ft ADU: Your Boston Planning Guide 2026
In Cambridge and Somerville, we talk to a lot of homeowners who are in the same spot. They like their block, they don't want to move, but the house no longer fits the way the family lives now. Maybe a parent needs a private place nearby. Maybe a grown child needs a soft landing. Maybe […]