Tiverton planners discuss ADU limits and enforcement as part of zoning overhaul

Accessory dwelling units (ADUs) and related accessory‑structure rules drew sustained attention at the Oct. 30 Tiverton Planning Board workshop as staff and members worked to reconcile state mandates with local enforcement goals.

Planning staff reviewed the state framework that sets baseline standards and told the board the town can adopt local maximums consistent with state law. Members debated whether a detached ADU constructed above a garage should have that garage counted toward the ADU’s square‑foot cap and whether municipalities can effectively police initial occupancy designations (for example, an ADU established for a family member that later becomes a market rental). The planner noted monitoring agents — typically nonprofit CDCs or Rhode Island Housing when deed‑restricted units are involved — perform income verification for rental units and that deed‑restricted owner‑occupied purchases usually include resale restrictions to cap equity.

Board members asked staff to craft clearer local definitions and a set of standard, defensible responses to common but novel proposals so the zoning officer can respond consistently. The planner cautioned that state law narrows some local regulatory tools; as a result, enforcement will often be administrative and case‑by‑case rather than through broad new prohibitions.

The board did not adopt final text at the workshop and asked staff to return with revised language to include in the public‑hearing draft. The board also endorsed maintaining a conservative accessory‑structure cap (discussed at 480 square feet) to avoid excessive garage conversions that could circumvent ADU size limits.