New Hampshire 2025 Regular Session

New Hampshire House Bill HB577

Introduced
1/16/25  
Refer
1/16/25  
Report Pass
2/26/25  
Engrossed
3/11/25  
Refer
3/11/25  
Report Pass
5/13/25  

Caption

Relative to modifying the definition of ADUs.

Impact

The bill mandates that municipalities allow an accessory dwelling unit as a matter of right in any district that permits single-family homes. It restricts local governments from imposing additional regulations on ADUs regarding lot size and other building requirements that are more stringent than those applied to single-family homes. This significantly simplifies the process for homeowners looking to add ADUs, potentially increasing the availability of housing in the state and directly addressing concerns related to housing shortages.

Summary

House Bill 577 seeks to modify the legal framework surrounding accessory dwelling units (ADUs) in the state. The bill aims to expand the definition and regulations governing ADUs, allowing municipalities to permit one accessory dwelling unit per single-family dwelling. This unit can be either attached to or detached from the principal dwelling, broadening the types of structures that can be classified as ADUs. Additionally, the bill proposes increasing the maximum allowable square footage for these units, which currently must not exceed 950 square feet unless authorized otherwise by municipal regulations.

Conclusion

Overall, HB577 represents a significant shift in housing policy, with a clear aim of encouraging the development of accessory dwelling units to address housing shortages. However, as with many legislative changes, the balance between state requirements and local governance will likely continue to be a point of discussion among stakeholders as the bill progresses through the legislative process.

Contention

While supporters of HB577 argue that the bill will facilitate affordable housing options and provide an avenue for homeowners to generate additional income, opponents may raise concerns about the potential loss of local zoning control. Some municipalities might be apprehensive about the increased density and the impact on neighborhood character or infrastructure. Additionally, the bill allows for the conversion of existing structures, which could lead to debates about compliance with community standards and regulations.

Companion Bills

No companion bills found.

Previously Filed As

NH HB1291

Relative to accessory dwelling unit uses allowed by right.

NH HB423

Relative to accessory dwelling unit uses allowed by right.

NH HB340

Relative to the transfer of residential property.

NH HB490

Relative to modifying the definition of neglect.

NH HB1521

Relative to recovery houses.

NH SB538

Relative to zoning procedures concerning residential housing.

NH HB177

Relative to the definition of qualified structures under the community revitalization tax relief incentive.

NH HB237

Relative to the date of asset evaluation for purposes of determining eligibility for certain property tax exemptions.

NH HB1065

Relative to fire sprinkler requirements in residential buildings.

NH SB591

Modifying definitions, claims procedures, and funding relating to the youth development center settlement fund and claims administration.

Similar Bills

CA AB916

Zoning: bedroom addition.

CA AB1154

Junior accessory dwelling units.

CA SB13

Accessory dwelling units.

CA AB68

Land use: accessory dwelling units.

CA SB773

Emergencies: State 911 Advisory Board.

CA AB881

Accessory dwelling units.

CA AB1033

Accessory dwelling units: local ordinances: separate sale or conveyance.

CA SB897

Accessory dwelling units: junior accessory dwelling units.