top of page
A gray and cedar gooseneck tiny home on wheels with a blue door in California, its owner standing in front.

Tiny Homes in California: 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 California. On a permanent foundation it is a house under the state residential code, which includes a tiny house appendix. On wheels, it is usually built and registered as an RV or park trailer, so living in one full time depends on your city or county, and several, including Los Angeles, Fresno and San Luis Obispo, allow one as a backyard unit. California's ADU law is one of the strongest in the country, and a 2026 law lets homeowners build two detached ADUs by right on a single-family lot starting in 2027. California has the 3rd highest cost of living of the 50 states, an income tax of 1 to 12.3 percent (plus 1 percent on income over $1 million), an effective property tax rate of 0.70 percent (19th lowest), and homeowners insurance averaging $1,820 a year. We have filmed more than ten tiny homes here.

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

In California, the type of tiny home you choose decides most of the rules. A tiny home on a permanent foundation, meaning it is anchored to a base built into the ground, like a concrete slab or piers, is a house and must meet the California Residential Code. A tiny home on wheels, built on a trailer so it can be towed, is usually built to count as a recreational vehicle or park trailer under state law, and the state's housing agency says RVs are not meant to be permanent homes unless a local ordinance allows it. One that fits neither definition has to meet the building code. The big opening is the state ADU law, which makes a small second home on a single-family lot easier to permit in California than almost anywhere.

This guide covers the codes, wheels, the ADU law, wildfire rules, where the communities are, and the California homes we have toured.

Quick facts

  • On a foundation (anchored to a base in the ground): a house under the 2025 California Residential Code, in effect since January 1, 2026.
  • On wheels (built on a trailer): treated as an RV or park trailer when built to that standard. Whether you can live in one full time, and where, is up to your city or county.
  • Building code in force: the 2025 California Building Standards Code, effective January 1, 2026.
  • Sleeping lofts (a raised sleeping area reached by a ladder or stairs): covered by the tiny house appendix (Appendix BB). The state housing agency appears to have adopted it for the whole state, but Riverside County and Berkeley adopted it locally too, so how it is applied can vary. Ask your building department.
  • ADUs (a second, smaller home on the same lot as a house): state law requires cities and counties to approve them on single-family lots, with no owner-occupancy requirement for the ADU.
  • Septic (an underground system that treats wastewater where there is no city sewer): usually permitted by your county environmental health department.

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

Yes. How depends on the home type.

  • On a foundation, a tiny home is a house. It has to meet the California Residential Code, and the tiny house appendix gives lofts and stairs their own rules where it applies.
  • As an ADU, a small home behind a house is the easiest path. State law sets the rules, and cities have to follow them.
  • On wheels, the state's housing agency says RVs are not meant to be permanent homes and generally may be lived in only in mobilehome parks or special occupancy parks, unless a local ordinance allows otherwise. A number of cities and counties now do.

The rules in plain words

Building code

The 2025 California Building Standards Code took effect January 1, 2026. Homes on foundations follow the 2025 California Residential Code.

The code includes a tiny house appendix, now called Appendix BB (what Appendix Q is; it was Appendix Q in the 2019 code and Appendix AQ in 2022). It covers homes of 400 square feet or less, not counting lofts. Whether it applies to your home is not settled in plain words, and three things pull in different directions. The appendix's own note says it is not mandatory unless a state agency or a local ordinance adopts it. The adoption table printed with the 2025 code shows the state housing agency (HCD), which sets housing rules across California, adopting the whole appendix, which points to it applying statewide. But that table calls itself a reference aid, not the rule itself, and some places adopted the appendix locally anyway, Riverside County for unincorporated areas in December 2025 and Berkeley with its 2025 code. Taken together, the sources lean toward the appendix applying across the state, but building departments may read it differently. Ask yours how it applies before you design a loft around it.

Where it applies, the appendix sets loft rules: a loft must have at least 35 square feet of floor area and be at least 5 feet in any horizontal direction, ladders are set at 70 to 80 degrees, and guards are 36 inches high or half the clear height to the ceiling, whichever is less. If you would rather skip the loft ladder, see tiny home layouts without a loft.

A 2025 state law (AB 130) also freezes most new state and local residential building standards from October 1, 2025 to June 1, 2031, with exceptions such as wildfire home hardening.

Tiny homes on wheels

State law does not define a "tiny home" or "movable tiny house." It defines a recreational vehicle, with less than 320 square feet of internal living area and 400 square feet or less overall, on a single chassis, and a park model trailer, which the law describes as built "for recreational or seasonal use only." The state housing agency says a tiny home on wheels that fits neither definition has to meet the building code like any other home.

Where you can live in one is a local zoning decision, and the answers range widely.

  • Los Angeles allows one movable tiny house as an ADU on a lot, 150 to 430 square feet, registered with the DMV and certified to the ANSI or NFPA standard, with the wheels and hitch hidden from view.
  • San Luis Obispo allows one in the backyard of a site with an owner-occupied home, up to 400 square feet not counting the loft, with a permit renewed every few years.
  • Fresno allows one as a backyard cottage, up to 440 square feet, DMV licensed, on a concrete pad with sewer and water, with the owner living in one of the two homes.
  • Placer County allows one as an ADU, as a single-family home in certain zones, and in movable tiny house communities, up to 400 square feet.
  • Shasta County, by contrast, treats a tiny home on wheels as an RV that cannot be lived in on a residential lot, only in an RV park or campground.

Modular, manufactured and factory-built homes

Factory-built homes built to the California code carry an insignia from the state housing agency (HCD), and the local building department handles the permit, foundation and utilities. A 2026 law (AB 1815), which takes effect January 1, 2027, bars cities and counties from applying building standards to factory-built housing that exceed or differ from the state's, with narrow exceptions.

State law requires every city and county to allow a HUD-code manufactured home on a foundation on any lot zoned for a single-family home, under the same development standards as a site-built house. The city can limit only the roof overhang, roofing material and siding, and it may choose to exclude homes more than 10 years old. Lots in historic districts or with historic designations can be exempt. A manufactured home can also be an ADU.

The ADU law

California's ADU rules are set by state law, and cities and counties have to follow them.

  • What must be approved without a hearing. One ADU and one junior ADU within the space of a single-family home, and a detached new ADU with 4-foot side and rear setbacks.
  • Size. Local limits on lot coverage, floor area, open space, front setbacks and lot size cannot block an ADU of at least 800 square feet of interior living space. A city's maximum size cannot be set below 850 square feet, or 1,000 square feet for more than one bedroom.
  • Height. At least 16 feet for a detached ADU, 18 feet near major transit (plus 2 feet to match the roof pitch), and at least 25 feet for an attached ADU, or the local height limit for the main home if that is lower. On a lot with a multistory apartment building, a detached ADU gets at least 18 feet.
  • Owner occupancy. A city cannot require the owner to live on the property for an ADU. It can bar rentals shorter than 30 days.
  • Parking. No parking can be required within half a mile walking distance of public transit, and in several other cases. Parking removed to make room for an ADU does not have to be replaced.
  • Timeline. The city must decide within 60 days of a complete application, or the application is deemed approved.
  • Fees. No impact fees on an ADU of 750 square feet of interior living space or less.
  • Junior ADUs. Up to 500 square feet, inside the house.
  • HOAs. State law voids HOA rules that effectively prohibit or unreasonably restrict an ADU on a single-family lot.

Coming January 1, 2027. A 2026 law (AB 956) lets owners build two detached new ADUs by right on a lot with a single-family home, and extends the HOA protection to lots zoned to allow single-family homes.

Splitting a lot (SB 9, 2021)

On a single-family lot in an urban area, a city must approve a split into two lots of roughly equal size, each at least 1,200 square feet unless the city allows smaller, if the owner signs an affidavit to live in one of the homes for at least three years. Cities cannot set standards that keep a unit below 800 square feet. Many lots do not qualify, including land in very high fire hazard zones, farmland, flood and earthquake fault zones, historic districts and lots that had tenants in the last three years, so rural land often will not.

Wildfire rules

A new California Wildland-Urban Interface Code took effect January 1, 2026. It applies to new homes and additions in mapped Fire Hazard Severity Zones and wildland-urban interface areas, and sets rules for siding, vents and decks. The state Board of Forestry adopted "Zone 0" rules for the first 5 feet around a home in August 2026, then withdrew them from state review in September, so none are in effect yet. Watch for a new version. Check the CAL FIRE map for your land before you buy.

Where to start

  1. Not sure which office covers your land? USA.gov's local government finder points to a directory of California's counties and cities, with their websites and contacts.
  2. Call the city or county planning department for your land. Ask which zones allow a tiny home on a foundation, and whether a tiny home on wheels is allowed as an ADU or a primary home.
  3. Ask the building department how it applies Appendix BB, the tiny house appendix, in the 2025 code.
  4. For an ADU, read the state housing agency's ADU Handbook (updated March 2026), then talk to your city.
  5. If the land is not on sewer, call your county environmental health department about septic and well permits.
  6. Check the CAL FIRE Fire Hazard Severity Zone map for the land, and what your city's wildfire rules require.
  7. For a tiny home on wheels, plan on DMV registration and ANSI or NFPA certification, which most local programs require.

From people who work in California

California has many rules about where a Tiny House on Wheels or modular home can go. Many people assume that if they have land, they can set one down and start living, only to run into red tape. Each home type follows its own path, and choosing the wrong one can stall a project for months.

A common surprise is thinking that a small size means fewer rules. Zoning, setbacks, utility connections, and permits still apply, and they can look very different from one county to the next, even between neighboring towns. Where a THOW [tiny house on wheels] isn't allowed, a modular home may well be.

Jacob Brown, JT Collective Tiny Homes

Living in California

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

  • Happiness score (WalletHub 2026). 60.58 out of 100, 9th happiest
  • Cost of living (MERIC, Q2 2026; U.S. average is 100). 140.3 (housing 192.1), 3rd highest
  • State income tax on wages. 1 to 12.3 percent across nine brackets, plus 1 percent on income over $1 million
  • Property tax, effective rate on owner-occupied homes (Tax Foundation, 2024 data). 0.70 percent, 19th lowest
  • Homeowners insurance, average a year with $400,000 in dwelling coverage (NerdWallet 2026; U.S. average $2,490). $1,820
  • Health care (U.S. News 2026). 7th
  • Education (U.S. News 2026). 25th
  • Average temperature, 1991 to 2020. 59.0 degrees F
  • Average precipitation, 1991 to 2020. 22.3 inches a year
  • Sunshine in San Diego. 68 percent of daylight hours, 146 clear days a year
  • Outdoor recreation, share of the state economy (BEA 2024). 2.2 percent (U.S. 2.4 percent)
  • State parks (California State Parks). 280 park units, more than 68 million visits a year
  • People 65 and older (Census estimates, 2024). 16.5 percent (U.S. 18.0 percent)

WalletHub ranks California the 9th happiest state, and U.S. News ranks it 7th in health care. Living costs are among the highest in the country, driven by housing, while homeowners insurance averages below the national figure. The income tax is graduated, from 1 percent up to 12.3 percent, plus 1 percent on income over $1 million. San Diego sees sun in 68 percent of daylight hours.

Rankings mix many factors, and statewide averages hide big differences between regions. The coast, the Central Valley, the deserts and the mountains have very different weather and costs, so look at the area where you plan to live.

Tiny home communities in California

These communities come from public listings. Rules, prices and openings change, so contact each one directly before you plan around it.

  • Park Delta Bay, Isleton. An RV park in the Delta that welcomes tiny houses on wheels certified to the RVIA standard or equivalent and registered with the DMV. Its site says residents can stay "for any length of stay."
  • Tiny Tranquility @ The Redwoods, Hiouchi. Long-term sites for tiny homes built to RV standards, up to 400 square feet, near Jedediah Smith Redwoods State Park. Its site says there are no limits on how long you can stay, and lists 2026 rent at $775 a month plus electricity.

A resort that sells park models.

  • Golden Village Palms, Hemet. You own a park model cottage and lease the land from the resort. Its site describes an active adult community with year-round residents; ask about the age requirement.

Tours we have filmed in California

We have filmed more than ten tiny homes in California. Here are some of them. Each video description says more about the home and, where the owner is happy to share it, where it is.

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 California?

Yes. On a permanent foundation, a tiny home is a house under the California Residential Code. As an ADU, state law sets the rules cities must follow. On wheels, it is usually built as an RV or park trailer, and full-time living depends on your city or county.

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

Only where your city or county allows it. Some allow one as a backyard unit, such as Los Angeles, San Luis Obispo and Fresno, with DMV registration and ANSI or NFPA certification. Others, such as Shasta County, allow living in one only in an RV park or campground.

Does California use Appendix Q for tiny houses?

California's residential code includes the tiny house appendix, now called Appendix BB, but whether it applies everywhere is not spelled out. The adoption table printed with the 2025 code shows the state housing agency (HCD) adopting the whole appendix, which points to statewide use. The appendix itself says it applies only once a state agency or a local ordinance adopts it, the table calls itself a reference aid, and Riverside County and Berkeley adopted it locally anyway. Ask your building department how it applies it.

Can I build an ADU in California?

Yes, on most single-family lots. State law requires cities to approve an ADU of at least 800 square feet with 4-foot side and rear setbacks, decide within 60 days, and waive impact fees for ADUs of 750 square feet or less. Starting in 2027, two detached ADUs are allowed by right on a single-family lot.

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

Yes, if the land is not on sewer. Your county environmental health department usually issues septic permits under the State Water Board's onsite wastewater policy, often through a local program approved by the regional water board.

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.

bottom of page