The bill amends Section 45-24-73 of the General Laws regarding zoning ordinances to establish design standards for accessory dwelling units (ADUs) and ensure consistent statewide treatment. It allows one ADU per lot under specific conditions, such as being on owner-occupied properties or within the existing footprint of a primary structure. The bill sets uniform standards for municipalities, including minimum size requirements for ADUs, restrictions on tenant qualifications, and limitations on fees and infrastructure improvements. It also prohibits local ordinances from imposing additional restrictions on ADUs and ensures that private restrictions from homeowner associations do not conflict with the provisions of this section.

Additionally, the bill introduces new provisions that will take effect on July 1, 2025, allowing municipalities to regulate ADUs by requiring owner-occupancy, occupancy by family members or caretakers, and limiting the size of ADUs to 800 square feet without the option for a variance. These provisions are optional for municipalities, meaning they can choose to implement them but are not mandated to do so. Overall, the bill aims to facilitate the development of ADUs while maintaining certain standards and protections for homeowners and municipalities.