The Basics in Massachusetts
ADUs are now allowed by right statewide in all single-family residential zones—meaning homeowners can build small units (up to 900 sq ft) on their property without needing a special permit. The reform overrides local bans, with a goal of supporting aging in place, multigenerational living, and rental income opportunities. The state estimates that 8,000 to 10,000 ADUs could be built over the next five years as a result of this change, although no official data is currently available.

A trend in New England with a variety of outcomes
ADU policies vary across New England, reflecting each state's approach to balancing housing needs with local control. Massachusetts and Vermont stand out for requiring ADUs to be allowed by right in single-family zones, with Massachusetts implementing the most comprehensive and uniform policy. Connecticut, Maine, New Hampshire, and Rhode Island offer a spectrum of more restrictive policies that give discretion to local communities.

Living in—or renting out—an ADU comes with a unique set of challenges and opportunities. We found this Dwell Magazine article particularly helpful in identifying the key factors to consider. 

We’ll be keeping a close watch on developments here in Massachusetts—and how both small and big ideas are shaping the future of where we live. If you would like more detailed information about building an ADU in your backyard, you know where to find us!