This bill modifies the existing laws regarding Accessory Dwelling Units (ADUs) by expanding their definition and allowing for detached units. The definition of an ADU is updated to specify that it can be located on a lot containing a single-family dwelling and may be constructed simultaneously with the principal dwelling. New definitions for "attached unit" and "detached unit" are introduced, clarifying the distinctions between the two types. The bill also repeals and reenacts RSA 674:72, which mandates that municipalities allow one ADU, either attached or detached, as a matter of right in all zoning districts that permit single-family dwellings, without imposing additional requirements for lot size or other controls beyond those applicable to single-family homes.

Furthermore, the bill stipulates that municipalities must permit one detached ADU and outlines various regulations regarding ingress and egress, parking, and occupancy. It allows for the conversion of existing structures into ADUs, regardless of current dimensional requirements, and ensures that municipalities cannot deny separate electrical service for these units. The maximum living space for an ADU is set at 950 square feet, with a minimum of 750 square feet, and municipalities are prohibited from limiting the number of bedrooms in an ADU. The act is set to take effect on July 1, 2025.

Statutes affected:
Introduced: 674:71, 674:73
As Amended by the House: 674:71, 674:73
Version adopted by both bodies: 674:71, 674:73