ADU Requirements in Boston, MA
Suffolk County • Updated for 2024 MA ADU Law
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About ADUs in Boston, Massachusetts
Boston is located in Suffolk County, Massachusetts. Under the 2024 Affordable Homes Act, homeowners in Boston can now build accessory dwelling units (ADUs) up to 900 square feet by-right, meaning no special permit is required for compliant projects.
An ADU in Boston can be a detached backyard cottage, an attached addition, or a conversion of existing space like a basement or garage. These units are perfect for housing aging parents, adult children, or generating rental income.