Redfish Lake with the Sawtooth Mountains behind it in central Idaho.

Tiny Homes in Idaho: Laws, Communities and Real Tours

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

The short answer

Yes, you can live in a tiny home full time in Idaho, on a permanent foundation and where local zoning allows it. Idaho uses the 2018 International Residential Code, and whether its tiny house appendix applies to your home depends on your building department. A tiny home on wheels is titled as an RV when it fits one of the state's RV definitions, and local zoning decides where you can live in one. Since July 1, 2026, cities with more than 10,000 people cannot ban ADUs in residential zones, and they have until February 1, 2027 to update their rules. Idaho has the 21st highest cost of living of the 50 states, a flat 5.3 percent income tax, an effective property tax rate of 0.50 percent (6th lowest), and homeowners insurance averaging $2,195 a year. We list two tours we filmed in Idaho below.

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

In Idaho, the state adopts the residential code, and your city or county enforces it if it runs a building program. Zoning is local too. A tiny home on a permanent foundation, meaning it is anchored to a base built into the ground, like a concrete slab or a crawl space, is a house under the state code. A tiny home on wheels, built on a trailer so it can be towed, is titled as a recreational vehicle when it meets the state's park model or travel trailer definition, and the new ADU law does not cover it.

This guide covers the state code and the tiny house appendix, permits, homes on wheels, manufactured and modular homes, the 2026 ADU and housing laws, septic, wells and snow, and what we found when we looked for communities.

Quick facts

On a foundation (anchored to a base in the ground): a house under the Idaho Residential Code, based on the 2018 International Residential Code.
Tiny house appendix (Appendix Q): not settled statewide. Boise applies it. Ask your building department.
Building permits: issued by your city or county if it runs a building program. Places that never had one are not required to start one.
On wheels (built on a trailer): titled as an RV when it fits the state's park model or travel trailer definition. Local zoning decides where you can live in one.
ADUs (a second, smaller home on the same lot as a house): since July 1, 2026, cities with more than 10,000 people cannot ban them in residential zones. Homes on wheels are not ADUs under this law.
Septic (an underground system that treats wastewater where there is no city sewer): permitted by your public health district before you install it.

Can you live in a tiny home full time in Idaho?

Yes, on a permanent foundation where local zoning allows it. On wheels, it depends on your city or county.

On a foundation, a tiny home is a house. It has to meet the residential code your building department enforces, and it needs sewer or a permitted septic system.
On wheels, we found no state law that allows or bans living full time in one. Local rules decide. Boise, for example, allows certified tiny homes on wheels behind a single-family home, and Bonner County requires a building location permit for each RV used as a dwelling.
The state sets no minimum house size that we found. Ask your city or county whether it does.

The rules in plain words

Building code

Idaho's residential code is the 2018 International Residential Code with Idaho's amendments, called the Idaho Residential Code (2020 Edition). The state rule adopts Parts I, II, III and IX of the 2018 code, and its amendments include dropping the national code's sprinkler requirement for one and two family homes. The Idaho Building Code Board adopts the code, and a new edition takes effect January 1 of the year after the board adopts it. In August 2026 the board reviewed draft legislation that would adopt the 2024 codes, taking effect July 1, 2028 if it passes.

Permits

Cities and counties that issue building permits must adopt and enforce the state residential code. State law says local governments that never had a code enforcement program "may elect" to start one by ordinance, so not every part of Idaho has building permits for a house. Septic, well and manufactured home rules apply either way. Ask your city or county who issues building permits for your land.

The tiny house appendix

The national code has an appendix with rules for tiny houses, often called Appendix Q. In Idaho, whether it applies to your home is not settled. Three things point different ways.

The state rule adopts Part IX of the 2018 code, which is the part that holds the appendices.
State law lets a city or county amend Part IX by ordinance, but it also says a local jurisdiction may not adopt any part of the national code that the state board has not adopted.
Boise's building department says Appendix Q applies to tiny houses there. Ketchum's list of adopted codes names a different appendix and does not mention Appendix Q.

What it means for you is that the same small home can be reviewed under the tiny house appendix in one city and under the standard rules in another. Ask your building department, in writing, whether it applies Appendix Q before you design or buy.

Where it is applied, as in Boise, the appendix covers homes of 400 square feet or less, not counting lofts. Living spaces and hallways need ceilings of at least 6 feet 8 inches, and bathrooms and kitchens at least 6 feet 4 inches. A loft must have at least 35 square feet of floor and be at least 5 feet wide in every direction, and its guard must be at least 36 inches high or half the clear height to the ceiling, whichever is less. The home still needs emergency escape openings. Boise also says tiny houses there need a permanent foundation. If you would rather skip the loft, see tiny home layouts without a loft.

Tiny homes on wheels

Idaho law defines a park model recreational vehicle as an RV built on a single chassis, originally on wheels, 400 square feet or less when set up, designed for "temporary accommodations for recreational, camping or seasonal use," and certified by its maker to the ANSI A119.5 standard for park trailers.

The Idaho Transportation Department's 2018 memo on tiny homes says a tiny home on wheels is titled, and may be registered, as an RV if it meets either the park model definition or the travel trailer definition. A travel trailer cannot be more than 8.5 feet wide, 14 feet high or 48 feet long. A home that fits neither is not covered by the memo, so ask the DMV how it will be titled before you buy or build.

The new ADU law says an ADU "does not include" a tiny home on wheels, an RV or similar homes on wheels. So the 2026 law does not make room for one in a backyard. Cities and counties set their own rules.

Boise allows tiny homes on wheels only as an accessory use to a single-family home. Up to two are allowed per parcel, each 400 square feet or less, certified to the NOAH+ standard or another standard the city approves. Each one sits behind the main home on a stable pad, anchored, with skirting around the wheels and chassis. It must connect to central water and sewer, typically through the main home's connection, and cannot be a short-term rental.
Bonner County's March 2024 handout says each RV used as a dwelling needs a building location permit, with one allowed on a lot under one acre and two on a lot over one acre.
Elmore County's 2020 handout allowed living in an RV during construction with an active building permit, and longer use with permits, approved water and septic, and the wheels raised or removed. The handout is several years old, so confirm the current rule.

That is a local zoning question everywhere in the state.

Modular and manufactured homes

Modular homes installed in Idaho must carry the state's insignia of approval, and a home with the insignia is deemed to comply with the state's codes, laws and rules for how such a building is made and built. The Division of Occupational and Professional Licenses runs the program.

Manufactured homes built to the federal HUD code are installed by a licensed installer, with a permit from your local building department or, where there is no local program, from the Division of Occupational and Professional Licenses.

Idaho's siting law already required every city and county to allow manufactured homes on land zoned for single-family homes, outside historic districts. HB 800, signed March 26, 2026 and in effect since July 1, 2026, updated it. A single-unit manufactured home may go on lots where single-family homes are allowed, and a manufactured home with more than one dwelling unit only where multifamily homes are allowed. HB 800 also lowered the largest minimum size a local government may set, from 1,000 square feet to 400 square feet for a single-section home and 800 for a multisection home. Local governments may still require, for example, a foundation that keeps the home no more than 12 inches above grade and siding and roofing similar to the neighborhood's, and they can hold a manufactured home to the same standards as a site-built home on the same lot. The law covers homes built to the federal HUD code. It does not mention tiny houses built to the residential code or homes on wheels, and it does not cancel recorded covenants.

ADU rules

SB 1354, signed March 31, 2026 and in effect since July 1, 2026, is Idaho's first statewide ADU law. It applies only to cities with more than 10,000 people. It does not name counties.

No city it covers may ban ADUs in any residential zone. An ADU is a self-contained home with its own kitchen, sleeping area and bathroom on the same lot as a single-family home. It can be inside the house, attached or detached.
By February 1, 2027, those cities must allow one internal ADU or one detached ADU per lot in single-family zones, outside historic districts.
Those updated rules may not cap an ADU at less than 1,000 square feet or 75 percent of the main home's size, require the owner to live on the property, or set a height limit lower than the existing main home.
They also may not require off-street parking for an ADU, unless the main home has no off-street parking, the street is unpaved or not built for street parking, or the home is within a quarter mile of transit, an employment area or shops and services.
ADU impact and connection fees cannot be higher than for other single-family homes, and an ADU that meets the city's rules is approved by staff as a matter of right.
Building, fire, floodplain, water and sewer rules still apply.

The same law changed the rules for homeowners associations. An HOA may not add, amend or enforce a covenant that limits or bans ADUs unless the affected owner agrees in writing, though it can still set reasonable rules on design, size, height, setbacks, parking and bedrooms.

Starter home lots

SB 1352, also in effect since July 1, 2026, bars cities with more than 10,000 people from banning starter home subdivisions in residential zones, and by February 1, 2027 those cities must update their rules to allow them. These are subdivisions of at least 4 acres with lots of no more than 1,500 square feet. Cities may not require minimum lots larger than that, unless infrastructure, lot shape or environmental limits make it unfeasible, and they can still deny a project when infrastructure cannot support it.

Septic

Idaho's seven public health districts run the septic program under the Department of Environmental Quality's rules. The district evaluates the site, issues the permit and inspects the work, and you need the permit before you install anything. The rule sets no minimum lot size, but the site must have room for two complete drainfields. Drainfields must be at least 100 feet from wells and other domestic water supplies. Owners installing their own standard or basic alternative system do not need an installer's permit under the rule. Otherwise, a permitted installer does the work. The rule lists composting toilets as commercially made non-discharging systems, and their plans must be submitted to DEQ for approval.

Wells

A household well in Idaho is exempt from a water right permit for domestic use of up to 13,000 gallons a day, including irrigating up to half an acre. Drillers must be licensed. In a subdivision whose application was filed on or after July 1, 2025, in an area under a state moratorium on new water rights or in a critical ground water area or ground water management area, a new well needs a water right permit for domestic uses other than in-home use and watering livestock. Ask the Idaho Department of Water Resources before you buy land in a new subdivision.

Snow

Snow loads vary a great deal across Idaho. The University of Idaho publishes ground snow load studies, and it notes that final design snow loads are the responsibility of the engineer, architect, local building official or contractor in charge of the project. If you are buying a factory-built tiny home or park model, ask what snow load it was built for and what your county requires.

Where to start

Not sure which office covers your land? USA.gov's local government finder points to a directory of Idaho's counties and cities, with their websites and contacts.
Call the city planning department, or the county if the land is outside city limits. Ask whether tiny homes, ADUs and homes on wheels are allowed there, and get the answer in writing.
Ask the building department whether it issues building permits for your land and whether it applies Appendix Q.
If the land is not on sewer, ask your public health district for a site evaluation and septic permit before you buy.
For a well, check the Idaho Department of Water Resources' domestic well rules and hire a licensed driller.
For a tiny home on wheels, ask the DMV how it will be titled.
For a manufactured home, use a licensed installer and ask who issues the installation permit.
Before buying land, check covenants, HOA rules and the snow load the county uses.

From people who work in Idaho

Don't buy land until you've confirmed exactly what type of tiny home the county will allow. Many buyers find a beautiful piece of property and assume they can place any tiny home they want on it. The reality is that a tiny home on a permanent foundation, a park model, a modular home, and a tiny home on wheels can all be treated differently under local regulations. In Blaine County, for instance, some cities within the county have their own zoning rules.

The biggest thing buyers haven't caught up with is that Idaho's rules are moving faster than public perception. Many people still think tiny homes and ADUs are difficult to approve, when in reality many jurisdictions are becoming more flexible as housing demand continues to grow.

Porter Talbot, Snake River Tiny Homes

Living in Idaho

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

Happiness score (WalletHub 2026). 62.59 out of 100, 4th happiest
Cost of living (MERIC, Q2 2026; U.S. average is 100). 99.4, 21st highest
State income tax. Flat 5.3 percent (2026)
Property tax, effective rate on owner-occupied homes (Tax Foundation, 2024 data). 0.50 percent, 6th lowest
Homeowners insurance, average a year with $400,000 in dwelling coverage (NerdWallet 2026; U.S. average $2,490). $2,195
Health care (U.S. News). 16th
Education (U.S. News). 30th
Average temperature, 1991 to 2020. 43.9 degrees F
Average precipitation, 1991 to 2020. 23.7 inches a year
Sunshine in Boise. 64 percent of daylight hours, 120 sunny days a year

Idaho's cost of living is just under the national average, and its effective property tax rate is 0.50 percent. The flat state income tax is 5.3 percent for 2026. Homeowners insurance averages $2,195 a year with $400,000 in dwelling coverage, compared with a U.S. average of $2,490. U.S. News ranks Idaho 16th in health care and 30th in education, and WalletHub ranks it 4th happiest.

Rankings mix many factors, and statewide averages hide big differences between regions. The Treasure Valley, the mountain towns, the Panhandle and eastern Idaho differ in weather, snow, land prices and local rules, so look at the area where you plan to live.

Tiny home communities in Idaho

We could not confirm a single Idaho tiny home community, or an RV park that takes tiny homes or park models for long stays, on its own website as of October 2026. Many directory listings for the state point to vacation rentals, to seasonal RV parks or to names we could not trace to a real operator. We would rather list none than send you to one that does not exist.

If you find one, check its own website, ask whether you buy or lease the lot, whether year-round living is allowed and which home types it takes, and contact it directly before you plan around it. We will add communities here as we confirm them.

Tours we have filmed in Idaho

Here are the two Idaho tours we can list. Each video description says more where the owner is happy to share it. Our tours from other states are at Tiny Home Tours by State.

House Hacking With a Backyard Tiny Home, Christy's 391 square foot park model behind the house she now rents out. Read her story.
Design That Flows: A $12k Tiny Home That Actually Works, Macy and James's self-designed tiny house, built in 2011 from reclaimed materials.

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 Idaho?

Yes, on a permanent foundation, if it meets the residential code your building department enforces and local zoning, with sewer or a permitted septic system. For a tiny home on wheels, local zoning decides.

Does Idaho use Appendix Q for tiny houses?

It is not settled statewide. The state adopts the part of the 2018 code that holds the appendices, but state law limits what cities and counties can add, and building departments differ. Boise applies Appendix Q. Ask your building department in writing.

Can I put a tiny home on wheels in my backyard in Idaho?

It depends on your city or county. Idaho's 2026 ADU law does not cover homes on wheels. Boise allows up to two certified tiny homes on wheels behind a single-family home, and Bonner County requires a building location permit for each RV used as a dwelling.

Can I build an ADU in Idaho?

In cities with more than 10,000 people, yes. Since July 1, 2026, those cities cannot ban ADUs in residential zones, and by February 1, 2027 they must allow one internal or detached ADU per single-family lot, with no owner occupancy rule and no size cap below 1,000 square feet or 75 percent of the main home. Elsewhere, ask your city or county.

Do I need a septic permit for a tiny home in Idaho?

Yes, if the land is not on sewer. Your public health district evaluates the site and issues the permit before you install anything. The rule sets no minimum lot size, but the site must have room for two complete drainfields.

Sources

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

Hero photo: Redfish Lake, Stanley, Idaho, by Laura Seaman on Unsplash.