A lake below forested mountains under a blue sky in New Hampshire.

Tiny Homes in New Hampshire: Laws, Rules and Communities

Updated November 4, 2026. Some laws may have changed since then. Confirm with your town before you buy land or a home.

The short answer

Yes, you can live in a tiny home full time in New Hampshire where your town allows it. On a foundation, a tiny home is a house under the state building code, which moved to the 2024 national residential code on July 1, 2026. On wheels, a state law that took effect September 13, 2026 defines a tiny house on wheels and says towns "may" allow one on a house lot or as an accessory dwelling unit. Whether a town can refuse one as the accessory dwelling unit it must allow is not settled. Since 2025, towns with zoning must allow one accessory dwelling unit, attached or detached, as a matter of right wherever single-family homes are allowed. New Hampshire has the 14th highest cost of living of the 50 states, no income tax on wages, an effective property tax rate of 1.50 percent (5th highest), and homeowners insurance averaging $1,500 a year.

On this page. Quick facts, the rules in plain words, where to start, living in New Hampshire, communities and common questions.

In New Hampshire, the state sets the building code, septic rules and shoreland rules, and each town decides zoning. A tiny home on a permanent foundation, anchored to a base built into the ground, is a house under the code. A tiny home on wheels now has its own category in state law, but your town still decides whether to allow one. Some parts of the new law have not been tested yet, and this guide says so where it matters.

This guide covers the 2026 tiny house law, the building code and the tiny house appendix, the accessory dwelling unit law, manufactured and modular homes, septic, shoreland rules and where to start.

Quick facts

On a foundation: a house under the state building code, which adopts the 2024 International Residential Code as of July 1, 2026.
On wheels: since September 13, 2026, state law defines a "tiny house on wheels" and says it is not a camp trailer or recreational vehicle when built for living in. Towns may allow one on a house lot or as an ADU.
Building code: every building built in the state must meet the state code. Towns, cities, counties and village districts, not the state, issue permits and certificates of occupancy, except for buildings owned by the state, its community college system or its university system.
Sleeping lofts: the 2024 state code keeps the national tiny house appendix (Appendix BB) and raises its size limit to 600 square feet of living space, not counting lofts. Through December 31, 2026, a permit can still follow the 2021 code, where the limit is 400 square feet.
ADUs (a second, smaller home on the same lot as a house): towns with zoning must allow one, attached or detached, as a matter of right wherever single-family homes are allowed, and cannot cap its living space below 750 square feet.
Septic (an underground system that treats wastewater where there is no sewer): the state Department of Environmental Services approves the design and the operation, and a permitted septic designer draws the plans.

Can you live in a tiny home full time in New Hampshire?

Yes, where your town allows it, on a foundation or on wheels.

On a foundation, a tiny home is a house. It has to meet the state building code and the town's zoning, and it needs sewer or a state-approved septic system.
On wheels, a home that meets the new state definition can be allowed by your town on a house lot where single-family homes are allowed, or as an accessory dwelling unit. The law says towns "may" allow this, so get your town's answer in writing.
Lot size, setbacks, septic and shoreland rules still apply in both cases.

The rules in plain words

Building code

New Hampshire's building code applies statewide. State law (RSA 155-A:2) says "All buildings, building components, and structures constructed in New Hampshire shall comply with the state building code and state fire code," and reserves permits and certificates of occupancy for counties, towns, cities and village districts, except for buildings owned by the state, the community college system or the university system.

A 2026 law (HB 1159) moved the state code to the 2024 International Residential Code and other 2024 codes, effective July 1, 2026, with state amendments approved through October 10, 2025. The energy code stays at the 2018 edition. State law (RSA 155-A:2) sets a 6-month period after a new code takes effect when an applicant can show compliance with either the earlier code or the new one, but not a mix of the two. The State Fire Marshal's office, which posts the state building code, puts that window at July 1 to December 31, 2026, and says all permit requests follow the 2024 codes from January 1, 2027, so ask which edition applies to your permit.

The tiny house appendix

The national code has an appendix for tiny houses, often called Appendix Q. It eases rules for ceiling heights, lofts and loft stairs and ladders. New Hampshire adopted it in full with its 2018 code (as Appendix Q) and its 2021 code (as Appendix AQ), where it covered homes of 400 square feet or less, not counting lofts.

The 2024 code, in force since July 1, 2026, keeps it. In the 2024 national code the appendix is renamed Appendix BB. The Building Code Review Board's summary of the state code as of July 1, 2026 lists Appendix BB, Tiny Houses, among the appendices that apply to homes under the residential code, and changes the appendix's tiny house size limit from 400 to 600 square feet of living space, not counting lofts. The board calls the summary a courtesy copy and says the legal record is the law that ratified the code (HB 1159) and the amendment papers.

Two things are still moving.

Through December 31, 2026, a permit can follow the 2021 code instead, where the appendix (Appendix AQ) stops at 400 square feet.
On September 11, 2026, the board approved more tiny house amendments "per HB1681," including one that adds the 2026 law's definitions of a tiny house, a tiny house on wheels and a yurt to the appendix. State law says statewide amendments take effect only after the legislature ratifies them (RSA 155-A:10), and we found no law that has done that yet.

Ask your building official which code edition and which tiny house rules they will use before you design a loft. If you would rather skip the loft, see tiny home layouts without a loft.

Tiny homes on wheels and the 2026 tiny house law

A 2026 law (HB 1681), in effect since September 13, 2026, created a category called "innovative housing structures," a single home "such as a tiny house, tiny house on wheels, or a yurt" (RSA 674:82).

A "tiny house" is a detached building with permanent places to live, sleep, eat, cook and use the bathroom that is 600 square feet or less, not counting lofts, complies with the tiny home provisions of the state building code, and is built on a stable ground surface or foundation.
A "tiny house on wheels" is "a tiny house built on a trailer chassis without motive power." The law says it "shall not be considered a camp trailer or recreational vehicle when constructed for human habitation."

Where one can go (RSA 674:83). A town "may permit" one "to be placed or erected on an individual house lot where single-family dwellings are allowed, or to be used as an accessory dwelling unit," subject to the town's land use rules. The law also says these homes "shall be treated as single-family dwellings or accessory dwelling units for zoning purposes," and they have to meet state rules for drinking water and wastewater.

How it is inspected (RSA 155-A:3-k). One built on its site has to meet the state building code. One built in a factory can be reviewed and inspected under the state building code or the state's modular building program, and if that approval conforms to the state building code, the local building official at the site has to accept it when issuing a certificate of occupancy. A factory-built recreational vehicle or park model built to the national RV standards does not count as factory construction under this law.

Moving one (RSA 674:84). A builder can move one built on a flatbed trailer chassis that meets trailer rules with a dealer plate or a temporary trailer plate from the Division of Motor Vehicles.

The law also tells the Department of Environmental Services to write wastewater rules for these homes (RSA 485-A:41). As of November 1, 2026, we found no such rule adopted; the department's septic rules were last changed February 1, 2026.

Can a tiny house on wheels be the ADU your town has to allow? Not settled.

The ADU law says one ADU, "which may be either attached or detached, shall be allowed as a matter of right" wherever single-family homes are allowed (RSA 674:72), and that a town "shall permit one detached accessory dwelling unit" (RSA 674:73).
The 2026 law says a town "may permit" a tiny house on wheels as an ADU "pursuant to RSA 674:72" (RSA 674:83, I), and in its next paragraph that these homes "shall be treated as single-family dwellings or accessory dwelling units for zoning purposes" (RSA 674:83, II).
Neither section says whether a town can refuse a tiny house on wheels that meets every rule a detached ADU must meet, and we found no court or state agency reading on it.

The "may permit" wording points toward leaving the choice with the town, while the "shall be treated as" wording and the by-right ADU rule point the other way, so the sources do not clearly lean either way. The home also has to meet the state code's tiny home provisions, which the law tells the state building code board to update. The board approved those changes on September 11, 2026, and they take effect once the legislature ratifies them. Before you buy, ask your town in writing whether it will accept a tiny house on wheels as a house or as an ADU on your lot. We found no state law that allows or bans living full time in a recreational vehicle; that is a local zoning question.

Modular and manufactured homes

For zoning, state law (RSA 674:31) defines manufactured housing as a home built on a permanent chassis that is at least 8 by 40 feet when moved, or at least 320 square feet when set up. Towns "shall afford reasonable and realistic opportunities" for it and "shall not exclude manufactured housing completely" (RSA 674:32). A town picks where to allow it, on individual lots in most residential areas, in manufactured housing parks and subdivisions in most residential areas, or both. A home on an individual lot meets the same lot size, frontage and other rules as a conventional house, with no special exception unless the town requires one for houses too.

Modular homes are built in a factory and can be reviewed and inspected through the state fire marshal's modular building program (RSA 205-C).

The ADU law

New Hampshire's ADU law (RSA 674:71 to 674:73) was rewritten by HB 577, in effect since July 1, 2025, and changed again by HB 1079, in effect since August 31, 2026. As it reads now, in towns with zoning:

One ADU, "which may be either attached or detached, shall be allowed as a matter of right" in every zoning district that allows single-family homes.
If the zoning ordinance says nothing about ADUs, one is a permitted use by right, with no town permits beyond building permits required by statute.
Apart from what the ADU law itself allows (below), the town cannot add lot size, setback, frontage, design review or other rules beyond what a single-family home without an ADU would need.
Living space is capped at 950 square feet unless the town allows more, and a town cannot cap it below 750 square feet.
A town may require the owner to live in one of the two homes, but cannot say which one.
Parking. If the town requires parking for the house, it may require up to one more space for the ADU, on the lot or at a legally dedicated spot elsewhere.
A town cannot require the ADU's occupants to be related to the owner, cannot limit it to one bedroom, and cannot deny it a separate electrical panel and service.
A town is not required to allow more than one ADU per house, and may bar ADUs with townhouses and on rented or leased land.
A town has to allow an ADU to be converted from an existing structure, such as a detached garage, even if it does not meet today's setback or lot coverage rules. Since August 31, 2026 (HB 1079), an existing structure means one that existed on or before July 1, 2025, and the town may ask you to show it is a legal nonconforming structure or had an earlier zoning approval.

Septic for an ADU. The ADU needs adequate water and sewage disposal under state law, but separate systems for the house and the ADU are not required, and a town cannot impose septic requirements greater than the Department of Environmental Services requires. A small backyard home can also be a rental; see one host's tiny backyard ADU.

Septic and water

The Department of Environmental Services reviews septic designs and issues an Approval for Septic System Construction. You need both that and an Approval for Operation before you use the system, and plans must be drawn by a permitted New Hampshire septic system designer. The department says an approval for construction is needed before converting a building from seasonal to full-time use or adding load to an existing system. Since February 1, 2026, all septic submissions must follow the department's revised rules and use its revised forms. Some towns also require their own approval. Check this before you buy land.

Shoreland

State law protects the shoreland within 250 feet of the reference line of public waters, including covered lakes and ponds, rivers and coastal waters (RSA 483-B). The department says a septic system near water may need a separate shoreland permit. If your land is near water, check this first.

Where to start

Not sure which office covers your land? USA.gov's local government finder points to a directory of New Hampshire's towns and cities, with their websites and contacts.
Call the town's building and zoning office. Ask whether a single-family home is allowed on the lot, what lot size and setbacks apply, how the town treats a tiny house on wheels under the 2026 law, and whether it will accept one as an ADU. Get the answer in writing.
If the land is not on sewer, talk to a permitted septic designer and the Department of Environmental Services before you buy.
If the land is within 250 feet of a lake, pond, river or the coast, check the state shoreland rules.
Ask the building official which code edition and which tiny house rules apply to your permit.
For a tiny home on wheels, ask the builder how it will be inspected (on site or through the modular program) and how it will be moved.
For a manufactured home, ask the town where it allows them, on individual lots, in parks, or both.

Living in New Hampshire

How New Hampshire compares with the other 49 states on the things people weigh before a move. Figures as of November 2026.

Happiness score (WalletHub 2026). 59.89 out of 100, 10th happiest
Cost of living (MERIC, Q2 2026; U.S. average is 100). 108.5, 14th highest
State income tax. None on wages or salaries (2026)
Property tax, effective rate on owner-occupied homes (Tax Foundation, 2024 data). 1.50 percent, 5th highest
Homeowners insurance, average a year with $400,000 in dwelling coverage (NerdWallet 2026; U.S. average $2,490). $1,500
Health care (U.S. News). 9th
Education (U.S. News). 12th
Average temperature, 1991 to 2020. 44.1 degrees F
Average precipitation, 1991 to 2020. 47.9 inches a year
Sunshine in Concord. 54 percent of daylight hours, 90 sunny days a year
People 65 and older (2024). 21.5 percent

New Hampshire's cost of living is above the national average, and its effective property tax rate is 1.50 percent. There is no state income tax on wages or salaries, and the Tax Foundation notes the old tax on interest and dividends was repealed as of January 1, 2025. Homeowners insurance averages $1,500 a year with $400,000 in dwelling coverage, compared with a U.S. average of $2,490. U.S. News ranks New Hampshire 9th in health care and 12th in education, and WalletHub ranks it 10th happiest.

Rankings mix many factors, and statewide averages hide big differences. The Seacoast, the southern tier near Massachusetts, the Lakes Region, the White Mountains and the North Country differ in weather, land prices and local rules, so look at the area where you plan to live.

Tiny home communities in New Hampshire

We did not find a New Hampshire tiny home community whose own website confirms it takes tiny homes for year round living. The directory listings we checked named places that are vacation rentals, staff housing or had no website of their own. Rules, prices and openings change, so contact any community directly before you plan around it.

We did not find an RV park in New Hampshire whose own site says it takes tiny homes or park models for monthly or longer stays.

Tours we have filmed in New Hampshire

We do not have a New Hampshire tour to list here yet. When we do, it will be listed here. Our tours from other states are at Tiny Home Tours by State.

Get new tours and guides

Every other Friday we send real tours, results from our audience polls, and parking and legal lessons from people living tiny. Join the Tiny Home Tours newsletter.

Frequently asked questions

Is it legal to live in a tiny house in New Hampshire?

Yes, where your town allows it. On a foundation, a tiny home is a house under the state building code. On wheels, a 2026 state law says towns "may" allow a tiny house on wheels on a house lot where single-family homes are allowed, or as an accessory dwelling unit. Whether a town can refuse one as the accessory dwelling unit it must allow is not settled, so get your town's answer in writing.

Can I park a tiny home on wheels on my own land in New Hampshire?

It depends on your town. Since September 13, 2026, state law defines a tiny house on wheels and says a town "may permit" one on a house lot or as an ADU, subject to land use, water and wastewater rules. Whether a town can refuse one as the detached ADU it must allow is not settled, so get your town's answer in writing.

Does New Hampshire use Appendix Q for tiny houses?

New Hampshire adopted the tiny house appendix in full with its 2018 code (Appendix Q) and its 2021 code (Appendix AQ). The 2024 code, in force since July 1, 2026, keeps it as Appendix BB and raises its size limit from 400 to 600 square feet of living space, not counting lofts. Through December 31, 2026, a permit can still follow the 2021 code, and more changes tied to the 2026 tiny house law wait for the legislature to ratify them. Ask your building official which rules apply to your permit.

Can I build an ADU in New Hampshire?

Yes. Towns with zoning must allow one accessory dwelling unit, attached or detached, as a matter of right wherever single-family homes are allowed. Living space is capped at 950 square feet unless the town allows more, a town cannot cap it below 750 square feet, and a town may require the owner to live in one of the two homes.

Do I need a septic permit for a tiny home in New Hampshire?

Yes, if the land is not on sewer. The Department of Environmental Services approves the septic design and its operation, and a permitted New Hampshire septic designer draws the plans. An ADU does not need its own separate system, and a town cannot impose stricter septic rules for an ADU than the department does.

Sources

This page explains the rules in general terms and is not legal advice. Local rules vary. Confirm with your town before you buy land or a home.

Hero photo: A New Hampshire lake, by Ron Barabash on Unsplash.