Mixed-Use Real Estate in New Hampshire: Why July 1, 2026 Changes Everything

Published: June 2026 | Author: Patrick Frazer, Commercial Real Estate Broker | NH & Southern Maine

If you own commercially zoned property in New Hampshire, the most significant zoning change in decades takes effect in less than a month. If you are a developer, investor, or business owner with real estate in a commercial corridor, you need to understand what is coming and what it means for your position.

Here is a straightforward breakdown of what is happening, who it affects, and where the opportunity is.

What Is HB 631 and Why Does It Matter

In July 2025, Governor Kelly Ayotte signed House Bill 631 into law. It takes effect July 1, 2026.

The law requires municipalities classified as urban areas by the U.S. Census Bureau to allow multifamily and mixed-use developments on commercially zoned properties as a matter of right. That means if your property is zoned commercial, office, retail, or parking, and it has adequate water and sewer infrastructure, a developer can now build residential or mixed-use on it without needing a special exception, variance, or conditional use permit.

This is not a minor tweak. Before HB 631, getting residential or mixed-use approved in a commercial zone required navigating public hearings, design reviews, and negotiating with planning boards – a process that added time, cost, and uncertainty to every project. That process is now bypassed for qualifying properties.

The law also limits what towns can do to slow things down. Municipalities cannot impose building height limits below 65 feet on qualifying projects, cannot require setbacks greater than what neighboring buildings already have, and cannot use design standards to create unreasonable delays or costs.

Who This Affects

Commercial property owners with vacant or underperforming buildings along commercial corridors – think Route 28 in Salem, Elm Street in Manchester, Central Avenue in Dover, or any strip with aging retail – now have a new exit strategy. What was previously a retail or office asset can be repositioned as a mixed-use development without the same permitting friction.

Developers who have been sitting on commercial land or watching deals stall in permitting now have a cleaner path to execution. The shift from discretionary approval to permitted use meaningfully reduces project risk and improves deal economics.

Investors evaluating commercial properties need to rethink valuation. A strip mall or underutilized commercial parcel in an HB 631-eligible municipality is not just a commercial play anymore – it has residential development optionality baked in. That changes the floor on value.

Tenants and business owners in commercial corridors will start to see the physical character of those areas change over the next several years as mixed-use projects replace underperforming single-use buildings.

Where It Applies in Southern NH

HB 631 applies to municipalities classified as urban areas by the Census Bureau. In Southern New Hampshire and the Seacoast, that includes cities and larger towns such as Manchester, Nashua, Concord, Portsmouth, Dover, Rochester, and others. Some communities that might not feel “urban” in the traditional sense are also captured by the Census definition.

Several towns have already moved to put growth moratoriums or amended site-plan regulations in place ahead of the July 1 effective date, trying to shape how HB 631 plays out in their communities. If you own commercial property in one of those towns, the window to get ahead of those local responses is closing fast.

The Adaptive Reuse Angle

One of the most direct near-term applications of HB 631 is adaptive reuse – converting existing commercial buildings into residential or mixed-use. Across Southern NH, there is no shortage of candidates: older office buildings with high vacancy, struggling strip centers with anchor tenant loss, and surface parking lots adjacent to downtown commercial districts.

The math on adaptive reuse has historically been challenging because of permitting risk. HB 631 removes a significant piece of that risk. It does not make every project pencil, but it makes more of them worth underwriting seriously.

The Colliers 2025 NH market review noted that office-to-residential and retail-to-mixed-use conversions gained serious traction in the past year. That trend accelerates meaningfully after July 1.

What Mixed-Use Actually Looks Like in This Market

Mixed-use in Southern NH is not the same as the high-rise live-work-play towers you see in Boston or Portland. The realistic product for this market is more likely:

• Ground floor retail or service commercial with one to three floors of residential above
• Converted strip center anchors repositioned with a residential component
• Downtown infill buildings with street-level commercial and upper-floor apartments or condos
• Adaptive reuse of underutilized office buildings near transit or walkable amenities

The demand side supports it. New Hampshire’s housing shortage is well-documented – the state needs an estimated 60,000+ additional units by 2030. Mixed-use development in commercial corridors is one of the more practical ways to add supply without consuming undeveloped land.

What to Do Now

If you own commercially zoned property in an HB 631-eligible municipality, now is the time to understand your options before the market catches up to what your property is worth under the new landscape.

That means getting a current valuation that accounts for the mixed-use development optionality, understanding whether your municipality has adopted any pre-July 1 amendments that affect your specific parcel, and identifying whether a sale, joint venture, or ground lease to a developer makes more sense than holding.

If you are a developer or investor looking for mixed-use opportunities in Southern NH, the most actionable move is identifying commercial parcels in high-infrastructure corridors before the broader market reprices them.

Either way, July 1 is not far away.

Patrick Frazer is a commercial real estate broker covering New Hampshire and Southern Maine across all asset classes. If you own commercial property and want to understand how HB 631 affects your position, contact Patrick Frazer directly.

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