Dennis planning board weighs state ADU rules, vows to bar short‑term rentals in protected units; hearing continued

The Town of Dennis Planning Board on Feb. 10 reviewed state-mandated changes to municipal zoning for accessory dwelling units, including a new state definition that makes many ADUs a protected use "by right" and limits local controls.

Paul, the town planner, told the board the state’s Chapter 150 (Act of 2024) alters the ADU definition so a protected ADU may be no larger than 900 square feet or half the gross floor area of the principal dwelling, whichever is smaller, and may be detached or modular but must meet building and health codes. He said municipalities may prohibit short‑term rental of the protected ADU itself but cannot change the statewide short‑term‑rental definition (rentals of 15–30 nights generally count as short‑term; 31 nights or more do not). "You can't have these protected ADUs be a short term rental," Paul said, explaining enforcement will rest with the building and health departments.

Why it matters: Town officials and residents said the combination of the new ADU protections and the state's short‑term‑rental definition could undercut the town's efforts to increase year‑round housing. "In a town that had 53% second homeowners, which has significantly chipped away at our housing stock, this compounds the problem," said Doria Dimano, who spoke during public comment, arguing the law could facilitate corporate buying and short‑term letting rather than creating homes for year‑round residents.

Residents and board members pressed the board for practical enforcement options. Julie Kenny of West Dennis suggested an annual permit fee to fund enforcement headcount: "Why could there not be just a small fee that each one pays every year that would fund enforcement headcount?" Paul and board members said the building commissioner will determine whether a proposed unit qualifies as a protected ADU and reiterated that the town must follow state registration and rooms‑tax requirements for short‑term rentals.

Board action and next steps: After public comment and further discussion, the board voted to continue the public hearing on the ADU and lot‑merger amendments to Monday, March 3, 2025, to allow staff to prepare a clearer, one‑page summary, maps, and additional legal context (including implications of a potential seasonal‑community designation). The motion to continue passed unanimously on roll call.

Other details: Paul said existing special‑permit conditions for past ADU approvals could be moot where the ADU now qualifies as a protected use under state law; the draft local edits propose adding a single listed parking requirement (no more than one required space for a protected ADU) while preserving applicable building, health, conservation and lot‑dimension standards. He also flagged a proposed accessory‑structure height limit (ridge height generally not to exceed 18 feet, 25 feet for steeper pitches) intended to keep accessory buildings subordinate to principal dwellings.

The board asked staff to return with a cleaner summary, diagrams showing district impacts and transit‑proximity calculations for the limited parking exception, and more information about the seasonal communities program and enforcement resourcing before making a final recommendation to town meeting.