Residential housing is now allowed in commercial zoning districts in New Hampshire. Last year, the New Hampshire Legislature enacted HB 631, a landmark housing measure requiring municipalities to permit multifamily housing in commercially zoned districts. The law generated significant discussion among developers, municipalities, and property owners, but questions remained regarding the extent of local regulatory authority and how these projects would be reviewed at the municipal level.
This year, the New Hampshire Legislature answered many of those questions in a way very favorable to the development community.
Now officially law, HB 1010 and HB 1588 are a one–two punch that reinforce and clarify the framework established by HB 631. Taken together, they send a clear message: multifamily projects are allowed by right in commercial districts, and municipalities may not use local regulations in a way that undermines or unreasonably restricts that objective.
Key Takeaways:
Limits on Municipal Regulation of Multifamily Projects
HB 1588 significantly strengthens the protections established by HB 631 by sharply limiting the regulations municipalities may impose on multifamily housing in commercial zoning districts. Municipal regulation is now limited to frontage, setback, and height requirements, and even those standards may not be more restrictive than those applicable to commercial uses within the same district.
The practical effect is substantial. Municipalities may no longer impose regulations that effectively reduce residential density or make multifamily housing economically infeasible. Restrictions such as caps on the number of dwelling units per building, limits on the number of two- or three-bedroom units, mandatory workforce housing set-asides beyond those authorized by state law, and similar density-control measures are no longer permissible. Nor may municipalities accomplish indirectly through special conditions or development standards what the Legislature has prohibited them from doing directly.
For years, many municipalities relied on layers of local regulations that, while not outright prohibitions, significantly increased development costs, reduced the number of permitted units, or delayed approvals. HB 1588 is aimed squarely at those practices. By limiting municipal authority to a narrow set of objective dimensional standards, the Legislature has substantially curtailed the use of local zoning regulations as a means of discouraging multifamily development in commercial districts.
Together, HB 631 and HB 1588 represent one of the most significant shifts in New Hampshire land use law in decades. HB 631 established that multifamily housing must generally be permitted in qualifying commercial zoning districts. HB 1588 ensures that mandate cannot be undermined through restrictive local regulation. The combined effect of HB 631 and HB 1588 is a fundamental reallocation of land use authority from municipalities to the State with respect to housing projects. For multifamily housing in commercial districts, local zoning authority has been materially reduced to dimensional standards – frontage, setbacks, and height – leaving little room for municipalities to impose additional regulatory barriers.
Attorney’s Fees Recoverable
Perhaps most importantly, HB 1588 includes a fee-shifting provision that allows applicants to recover attorney’s fees when a municipality improperly denies a multi-family project or imposes requirements on a multifamily project beyond those authorized by the state law. This provision significantly changes the litigation landscape by creating potential financial consequences for municipalities that don’t play by the new rules.
Municipal Review Authority Continues—But Is More Clearly Defined
Planning boards retain authority to evaluate traffic, water supply, wastewater capacity, and other infrastructure considerations. However, HB 1010 emphasizes that review must be tied to legitimate infrastructure concerns rather than generalized opposition to residential development.
Notably:
Where infrastructure is not currently adequate, the applicant may provide, fund, or upgrade the infrastructure necessary to support the project. HB 1010 expressly recognizes that traffic, water, and sewer issues may be addressed through infrastructure improvements rather than serving as a basis for denial.
Favorable Parking Guidance
The new legislation prohibits municipalities from requiring more than 1 parking space per unit or from requiring any parking spaces to be garaged.
Adaptive Reuse Opportunities Expand
The legislation expressly permits the conversion of existing nonconforming commercial structures into multifamily or mixed-use projects, provided that the building envelope is not expanded.
Special Assessment Districts
HB 1588 also establishes a new statutory framework authorizing municipalities to create Special Assessment Districts to finance public infrastructure needed to support new development, including roads, sidewalks, water and sewer facilities, stormwater systems, utility extensions, parking, and related improvements.
The legislation provides a simpler, more streamlined, and more flexible alternative to traditional tax increment financing (TIF) districts. Rather than relying on future tax increment revenues, complex valuation analyses, state approvals, and lengthy development agreements, infrastructure costs are financed through municipal bonds repaid solely by special assessments on the properties that directly benefit from the improvements. Districts may be established through memorandums of understanding with owners of just 60 percent of the affected properties, making them particularly well suited for commercial corridors and other areas with fragmented ownership.
Although not a replacement for TIF districts, this new financing tool will, in many cases, provide municipalities and developers with a faster, more predictable, and less cumbersome means of funding infrastructure improvements that support economic development.
What This Means for Property Owners and Developers
The practical impact of these changes extends well beyond new apartment construction.
Commercial properties that previously may have had limited redevelopment potential—including aging retail centers, office buildings, underutilized commercial parcels, and mixed-use sites—may now present new opportunities for residential development, adaptive reuse, or repositioning.
At the same time, municipalities retain meaningful authority to address legitimate concerns regarding infrastructure, public safety, and site design. The Legislature has not eliminated local review. It has, however, substantially narrowed municipalities’ ability to use zoning regulations to prevent multifamily housing otherwise authorized by state law.
Looking Ahead
The next chapter will be written by planning boards, zoning boards, and the courts.
Decisions regarding infrastructure standards, dimensional requirements, growth management ordinances, and the scope of municipal authority will undoubtedly continue to be tested. Nevertheless, the direction from the Legislature is unmistakable. HB 631, HB 1010, and HB 1588 collectively represent one of the most significant expansions of housing development opportunities in New Hampshire in decades.
Property owners, developers, investors, lenders, and municipalities should review pending projects and existing regulations carefully. Opportunities that did not exist a year ago may now be available.
This information is provided for educational purposes only. It should not be construed or relied on as legal advice. It is not intended to create, and receipt of it does not constitute, an attorney-client relationship. If you have specific questions regarding a particular fact situation, we urge you to consult the authors of this publication or other legal counsel.
