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Select Board backs ADU bylaw aligned with state law; 900‑sq‑ft cap noted
Summary
The board voted to support the planning board’s revised accessory dwelling unit (ADU) bylaw, which implements the state Affordable Homes Act’s protected‑use ADU rules and sets the statutory 900‑square‑foot cap.
The Sudbury Select Board voted to support a revised accessory dwelling unit bylaw that planners drafted to follow the Commonwealth’s Affordable Homes Act.
Planning Director Adam Burney told the board the state law, signed in 2024 and effective in early 2025, makes ADUs a protected use so long as they meet the statute’s size limits. Burney said the planning board’s replacement bylaw “put some very minimal guardrails, but tried to retain some of the flavor of the residential areas in Sudbury.”
The proposed local language follows the state statute in treating ADUs as allowable by right up to 900 square feet or 50 percent of the primary dwelling, whichever is smaller. The board discussed several implementation points that staff and the planning board emphasized: ADUs must meet building code; garages that are not conditioned space ordinarily are not counted in the floor‑area cap; ADUs are not short‑term rentals (Airbnb) under the draft; and septic capacity is a constraint — owners must demonstrate Board of Health approval for the additional bedroom loading where required.
Select Board Member Charlie moved support for the planning board’s article; the motion was seconded and passed by roll call. The board also discussed mechanisms for special permits or variances where lots have unusual constraints. Adam Burney said the planning board expects to start with the statute’s 900‑square‑foot baseline and reassess after implementation if demand suggests a change.
Why it matters: the state law protects owners’ ability to create ADUs that can expand housing options and can help families create in‑law or caretaker units. Local officials said the primary constraints in Sudbury will be septic capacity, wetlands, and site geometry, and that the bylaw aims to allow ADUs while minimizing impacts on scenic roads and stone walls.
Board members asked about enforcement and tax treatment. Burney said assessors are notified when a building permit is pulled and any finished unit would be captured in property valuation. He also said driveway curb cuts at the road will be limited by the bylaw language to minimize additional curb cuts on scenic roads; interior site access to a detached ADU would typically remain possible.
Formal action: the Select Board voted to support the planning board’s ADU zoning article, which will appear on the annual town meeting warrant.
