Bill > HB577

This bill modifies the legal definition and regulations surrounding Accessory Dwelling Units (ADUs) in New Hampshire, expanding homeowners' rights to create additional living spaces on their property. The bill defines two types of ADUs: attached units (within or connected to the principal dwelling) and detached units (separate from the main house), and mandates that municipalities allow one ADU as a matter of right in all zoning districts that permit single-family homes. Municipalities are prohibited from imposing additional restrictions on ADUs beyond those applied to single-family dwellings, such as limiting lot size, setbacks, design requirements, or parking. The bill specifies that ADUs can have up to 950 square feet of living space, must have independent living facilities, and can be created in existing structures like detached garages. Municipalities cannot require a familial relationship between occupants, limit ADUs to one bedroom, or deny separate electrical service. The bill also allows ADUs to potentially count towards a municipality's workforce housing obligations and requires that water and sewage provisions be made without necessarily creating separate systems. The new regulations will take effect on July 1, 2025, potentially making it easier for homeowners to add rental units or housing for family members on their property.

Business and Industry, Housing and Urban Affairs

https://gc.nh.gov/bill_status/legacy/bs2016/bill_status.aspx?lsr=0119&sy=2025&sortoption=&txtsessionyear=2025&txtbillnumber=HB577