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Planning Board recommends ADU rule changes to align with state law; residents ask about septic and size limits
Summary
The board updated accessory-dwelling-unit rules to reflect state changes (ADUs allowed by right; maximum size rules) and voted to recommend the amendments to the Select Board; residents asked how ADUs interact with wells, septic and whether multiple ADUs could apply in places with public services.
The Planning Board reviewed proposed revisions to Section 2000 on accessory dwelling units (ADUs) following state legislative changes. The draft would allow ADUs by right wherever a single dwelling is permitted, make ADUs detached or attached subject to the same dimensional standards, and retain a maximum ADU size of 1,000 square feet while applying an additional limit that an ADU may not exceed half the size of the primary dwelling.
A board member summarized the state-driven changes: "The state legislature updated the laws regarding ADUs... and now everybody can develop an ADU by right without having to get any kind of conditional use permit or special exemption." Residents asked whether the state also requires minimum ADU sizes, whether a second ADU would be allowed, and how ADUs would interact with private wells and septic systems. Staff clarified that while the state established some minimums elsewhere, several provisions (for example allowing a second ADU) apply only in municipalities with public water and sewer and therefore do not automatically apply in Brookline, which relies on wells and septic in much of town.
There was also a question about how the town’s dimensional rules interact: board members explained the ADU cannot exceed 1,000 square feet and cannot be larger than half the original residence; therefore a very large primary house would still leave the 1,000-square-foot cap as the hard maximum. After discussion the board closed the ADU hearing and voted to recommend placement of the proposed Section 2000 amendments on the March 2026 warrant.
What happens next: The Planning Department will transmit the recommended language to the Select Board and post explanatory material about how ADU rules apply to well-and-septic communities.
