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Council moves draft ADU law toward public hearing after small setback and review changes
Summary
Council and planner agreed to remove minimum square-foot rules, keep a 50% size trigger that requires planning-board review, let the building inspector approve most conversions inside existing structures, and add a limited planning/appropriateness review where small-lot setbacks create neighborhood impacts; public hearing to be scheduled.
City planner Natalie (last name not provided in transcript) walked Beacon council members through a revised draft local law to expand accessory dwelling units (ADUs) across single-family lots. The planner and council discussed setbacks, inspector approval authority, size limits and a new “certificate of appropriateness” review for constrained lots before the council agreed to advance the draft toward Planning Board review and a public hearing.
Natalie outlined the main changes in the draft law: ADUs would be permitted on any lot that contains a single-family home in all residential districts; minimum and maximum square-foot requirements were removed, but the draft retained a threshold that sends ADUs larger than 50% of the primary structure size to the Planning Board for site-plan review. The planner explained that the building inspector would have approval authority for ADUs contained entirely within an existing primary dwelling or an existing accessory building, and for modest expansions that do not change setback compliance.
Council members raised concerns about small lot districts where standard accessory setbacks (five feet) may place a residential ADU very near a neighbor. The planner and council discussed two approaches: raising setbacks in certain districts or creating a light-touch review. The council favored a targeted process rather than wholesale setback changes. The group agreed to add a modest review step — described during the discussion as a certificate of appropriateness or an abbreviated planning-board review — for accessory units that would sit very close to an adjacent dwelling (the planner was tasked with drafting a workable distance criterion and text for the draft law).
On the remaining size question, council members debated removing the 50% cap entirely, imposing an absolute square-foot maximum, or leaving the 50% trigger and requiring site-plan review above that threshold. Council sentiment favored retaining the 50% trigger as a planning-board referral but removing minimum square-foot limits; the council asked staff to prepare the draft with that approach.
Council members also agreed that ADUs created entirely inside existing structures or inside accessory buildings or by modest expansion that meets setbacks should remain under the building inspector’s authority rather than require full Planning Board review.
Next steps: Planner Natalie and the city attorney will incorporate the agreed clarifications — the building-inspector approvals for existing conversions, the retained 50% threshold that triggers site-plan review, and the certificate-of-appropriateness/light review for constrained small lots — and return a revised draft for scheduling a public hearing and referral to the Planning Board.
Why it matters: The changes are intended to increase housing supply by making ADUs easier to permit while retaining neighborhood protections for close-proximity conversions and projects that substantially change scale. The council’s revisions prioritize as-of-right conversions in existing buildings and a measured review for new detached accessory dwellings or projects that exceed a size threshold.
Sources: Presentation and exchange with Natalie (city planner), council members and the city attorney during the Beacon City Council workshop.
