AN ACT PROMOTING THE DEVELOPMENT OF ACCESSORY DWELLING UNITS.

This bill promotes the development of accessory dwelling units (ADUs) by updating state zoning regulations to allow these secondary housing units on single-family lots as a right, meaning local governments cannot ban them. The legislation defines ADUs as separate living spaces with cooking facilities on the same lot as a principal home and sets minimum size requirements while limiting what municipalities can require, such as prohibiting restrictions on occupants, utility billing, or rental use. Local zoning rules must allow ADUs to be attached or detached from the main home, with setbacks and lot coverage standards matching those of the primary residence, and municipalities cannot require more than one parking space or mandate owner occupancy. The bill also establishes a 65-day timeline for zoning commissions to review ADU applications and prevents conditions like mandatory fire sprinklers or corrections of nonconforming uses from blocking approval.