Housing / land use

Half-acre lot ceiling

What this is about

In many New Hampshire towns, zoning makes you buy one, two, or more acres before you can build a single-family house. That raises the cost of land even when the soils and water rules would allow a smaller lot.

What the model bill would do

It would set a statewide ceiling on those local minimums for a single-family lot (including one with an accessory dwelling unit under state law):

A town could not require more than half an acre (21,780 square feet) of lot area.
A town could not require more than 100 feet of road frontage.
Frontage on a private road could count, with the usual notice that the town does not maintain the road and is not liable for it.
State environmental rules for wells and septic systems would still control. If the Department of Environmental Services needs a larger lot for safe water or wastewater, that larger size wins.
Town setbacks and lot-shape rules could stay, as long as they do not recreate a bigger minimum lot or frontage by another name.
Existing planning-board and building-permit deadlines would stay the same. If a board or official misses the deadline already in statute, the applicant would get a fee refund (and, for some residential plats that win in court, attorney fees). No new clocks are created.

What it would not do

It would not force anyone to build. It would not make a town zone for housing. It would not change shoreland, wetlands, fire, or building-code rules. It would not apply to applications filed before it takes effect, and it would not block building on lots lawfully created earlier.

Honest limit

A protective circle around a private well is often about 75 feet in radius (about 150 feet across). A 100-foot-wide lot may need a recorded easement or neighbor overlap under existing state well rules. Some lots will still need more than half an acre because of soils.

Status

Model draft for discussion on consideringnh.com. Not introduced legislation. This is a model draft proposal — not introduced, not enacted, not OLS-filed. Not current New Hampshire law.

Talking points

Half an acre and 100 feet of frontage is a traditional New England village lot size, not a high-rise mandate.
Clean water and septic still come first: DES can always require more land.
The bill does not invent new permit deadlines. It only adds a fee consequence when towns miss clocks already in law.
Private-road lots keep the existing notice that the town does not plow or take liability.
Related 2025–2026 bills (HB 459, SB 84) went to interim study; neither became law. This draft is a statewide half-acre ceiling plus frontage, private-way, and fee-remedy pieces those bills did not carry.

Draft model bill (v2.1.4)

The text below is the full draft. Under this draft, the act would take effect 60 days after passage. It would apply to applications filed on or after that date. It has not been introduced, it has not been enacted, and it has not been filed with the Office of Legislative Services.

MODEL DRAFT v2.1.4 — NOT LEGAL ADVICE — NOT FILED — NOT ATTORNEY-REVIEWED

This is a model draft for discussion only. It is not legal advice, was not prepared by a licensed attorney, and every citation must be verified by NH Office of Legislative Services or counsel before use. It has not been introduced in the General Court.

AN ACT relative to statewide maximum minimum lot sizes, frontage, and private-way access for single-family homes, and relative to deadlines for planning board and building permit decisions.

Sec. 1 Purpose. To cap municipal minimum lot size and frontage requirements for single-family homes statewide, to preserve state environmental (DES) protections for water supply and wastewater, and to add a fee-refund and fee-shifting remedy when planning boards or building officials miss the statutory decision deadline.

Sec. 2 New Section; RSA 674:16-b. Amend RSA 674 by inserting after section 16-a the following new section:
674:16-b Maximum Minimum Lot Size and Frontage for Single-Family Lots.
I. Definitions. "Single-family lot" means a lot proposed or used for one detached single-family dwelling, with or without one accessory dwelling unit under RSA 674:71–73.
II. Maximum minimum lot size. No zoning ordinance, subdivision regulation, or site plan regulation adopted under RSA 674 or RSA 675 shall require a minimum lot area greater than one-half acre (21,780 square feet) for a single-family lot.
III. Maximum minimum frontage. No such ordinance or regulation shall require more than 100 feet of frontage for a single-family lot.
IV. Private ways. Frontage required under paragraph III may be satisfied on a private way, and a building permit shall not be denied solely because the lot fronts on a private way, provided the requirements of RSA 674:41, I(d) are met, including notice that the municipality is not responsible for maintenance or liability.
V. Environmental savings. Nothing in this section limits the authority of the department of environmental services under RSA 485-A, including RSA 485-A:29 through RSA 485-A:30-b, or rules adopted thereunder, including Env-Wq 1000, to require greater lot area, setbacks, or soils-based lot sizing for water supply and subsurface wastewater disposal. Where the department requires a greater area, the department's requirement governs.
VI. Geometry. A municipality may adopt reasonable lot-shape, setback, and buildable-area standards, provided such standards do not, alone or in combination, effectively require more lot area than paragraph II or more frontage than paragraph III allows.
VII. Conflict. Any ordinance or regulation inconsistent with this section is unenforceable to the extent of the inconsistency.
VIII. Construction. Nothing in this act shall be construed to authorize a lot or system that does not meet the minimum lot size, soil, or setback requirements of RSA 485-A or rules adopted under it. Where those requirements exceed the maximums in this section, the department's requirement governs. This act shall not be construed to limit development of any lot lawfully created before its effective date, or to override municipal regulations unrelated to minimum lot size or frontage.

Sec. 3 Planning Board Deadline Remedy. Amend RSA 676:4, I(c) by inserting at the end the following new subparagraph:
(3) If the planning board fails to act on a completed application within the 65-day period required by this subparagraph, as extended under this subparagraph, then, in addition to the applicant's existing remedies for deemed approval under this subparagraph:
(A) the municipality shall refund to the applicant all application and review fees paid to the municipality for that application, within 30 days of the applicant's written request; and
(B) where the application is a subdivision plat for residential lots that conform to RSA 674:16-b and the applicant obtains relief in superior court under this subparagraph, the court shall award the applicant reasonable costs and attorney's fees.
Nothing in this subparagraph shortens or otherwise changes the 65-day period or the extension provisions of this subparagraph.

Sec. 4 Building Permit Deadline Remedy. Amend RSA 155-A:4 by inserting after paragraph X the following new paragraph:
XI. If a building official fails to grant or deny a building permit application within the period required by paragraph IX:
(a) the municipality shall refund the building permit fee paid for that application within 30 days of the applicant's written request; and
(b) the building official shall not thereafter deny the application as incomplete for any reason not stated in writing to the applicant within that period.
This paragraph does not create a new deadline and does not change the period in paragraph IX.

Sec. 5 Applicability. This act applies to applications filed on or after its effective date.

Sec. 6 Effective Date. This act shall take effect 60 days after its passage.

MODEL DRAFT for discussion. Not legal advice. Not prepared or reviewed by a licensed attorney. Not filed or introduced. All RSA and rule citations, section numbering, and interaction with other 2026–2027 bills require verification by NH Office of Legislative Services and counsel.

Download the draft as a text file (v2.1.4).

This is not legal advice. This site is not a law firm and is not a registered lobbyist. This draft was not prepared by a licensed attorney.

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