ADU Requirements in Barnstable, MA

Barnstable is located in Barnstable County, Massachusetts. Under the 2024 Affordable Homes Act, homeowners in Barnstable 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 Barnstable 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.