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What is a tiny house?

A tiny house is a compact dwelling with living, cooking and bathroom space. Washington’s WAC 51-51-60104 caps its floor area at 400 square feet, excluding sleeping lofts. A residential tiny house and an RV follow different rules, so establish the construction category and proposed location before buying or requesting bids.

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By InstaBids editorial team with AI research agents. Updated

What this means for your home project

  1. In Washington, send the intended tiny-house location to the local building department and request its permit requirements before purchasing or building. Source: Washington State Department of Labor & Industries, read 2026-11-03.
  2. For a Washington project, request a written scope that separately identifies foundation work, installation and the proposed location on the property. Source: Washington State Department of Labor & Industries, read 2026-11-03.
  3. For an offsite Washington build, ask the builder to identify the inspection request needed before work is covered. Source: Washington State Department of Labor & Industries, read 2026-11-03.
  4. For Washington air-leakage testing, request a copy of the signed results report that is provided to the code official. Source: Washington State Legislature, read 2026-11-03.
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What if my tiny house is on wheels?

Wheels do not identify a single construction category. Washington allows a code-built dwelling on wheels; Portland treats inhabited tiny houses on trailers as occupied recreational vehicles under its zoning rules. Identify both the structure type and the destination jurisdiction. “A tiny house is a dwelling that may be built on wheels and is no larger than 400 square feet, including a kitchen, bathroom, and sleeping/living area, and must be built to the Washington State Building Code .” Source: Washington State Department of Labor & Industries, read 2026-11-03. “Tiny houses on wheels are included in the definition of "occupied recreational vehicles" when inhabited and parked on a developed residential lot with a primary dwelling unit or house.” Source: City of Portland, read 2026-11-03.

Where are recreational vehicles and tiny houses on wheels allowed?

In Portland, one occupied RV or tiny house on wheels can share a residential lot with a house, attached house or manufactured home. An undeveloped lot does not qualify, and the vehicle must sit at least five feet from the primary dwelling. “Only one occupied recreational vehicle or tiny house on wheels is allowed on a residential lot with a house, attached house or manufactured home.” Source: City of Portland, read 2026-11-03. “Occupied recreational vehicles, including tiny houses on wheels, are not permitted on undeveloped lots.” Source: City of Portland, read 2026-11-03. “These vehicles must be parked at least five feet from the primary dwelling.” Source: City of Portland, read 2026-11-03.

How will utilities be provided to RVs and tiny houses on wheels?

Portland requires an electrical connection on a dedicated circuit of at least 20 amps with ground-fault protection. A unit with internal plumbing must connect to drinking water and sanitary sewer; occupants of one without plumbing need access to those facilities in the primary house. “Electrical connections must be made through a dedicated outlet on a service pedestal or on the primary dwelling, which must be a minimum 20-amp, GFCI-protected, dedicated circuit.” Source: City of Portland, read 2026-11-03. “If the occupied recreational vehicle has internal plumbing, it must be connected to potable water and sanitary sewer services.” Source: City of Portland, read 2026-11-03. “If the occupied recreational vehicle or tiny house on wheels does not have internal plumbing, the occupants must have access to potable water, toilets and showers in the primary house.” Source: City of Portland, read 2026-11-03.

What does the tiny house building code actually require?

Washington’s WAC 51-51-60104 sets a 6-foot-8-inch minimum ceiling in habitable space and a 6-foot-4-inch minimum in kitchens and bathrooms. Its air-leakage test measures how much air escapes through the enclosure at a specified pressure; ask for the test method and signed results. “Habitable space in tiny houses shall have a ceiling height of not less than 6 feet 8 inches (2032 mm).” Source: Washington State Legislature, read 2026-11-03. “Bathrooms, toilet rooms and kitchens shall have a ceiling height of not less than 6 feet 4 inches (1930 mm).” Source: Washington State Legislature, read 2026-11-03. “The air leakage rate for tiny houses shall not exceed 0.30 cfm at 50 Pascals of pressure per square foot of the dwelling unit enclosure area.” Source: Washington State Legislature, read 2026-11-03. “Testing shall be conducted in accordance with RESNET/ICC 380, ASTM E 779 or ASTM E 1827 and reported at a pressure of 0.2 inch w.g. (50 Pascals).” Source: Washington State Legislature, read 2026-11-03. “A written report of the results of the test shall be signed by the party conducting the test and provided to the code official.” Source: Washington State Legislature, read 2026-11-03.

What affects the price of a tiny house?

Inspection readiness affects construction-process charges for an offsite tiny house in Washington. L&I charges for a requested inspection even when the work is not ready, and a return visit adds fees. Request an inspection schedule tied to completed construction stages. “You will need to have your tiny house inspected several times by L&I as you complete certain stages of construction.” Source: Washington State Department of Labor & Industries, read 2026-11-03. “If you've requested an inspection and you're not ready, you will still be charged.” Source: Washington State Department of Labor & Industries, read 2026-11-03. “If the inspector must return to the location, you will be charged additional fees.” Source: Washington State Department of Labor & Industries, read 2026-11-03.

How do I evaluate an unfinished tiny house for sale?

In Washington, start with the local building department’s requirements for the intended location. An offsite-built tiny house needs an L&I insignia when moved to its use site. For a completed or used unit, also ask whether the local department will accept that particular building. “If you are considering purchasing, or building, a new Tiny House — please make sure you check with the building department where you wish to build, or place the house to see what is required for their permit.” Source: Washington State Department of Labor & Industries, read 2026-11-03. “If you are buying an already completed, or used, tiny house – you will need to contact the local building department to see if they will permit/accept your building for use in their area.” Source: Washington State Department of Labor & Industries, read 2026-11-03. “If the new Tiny House is being built in a factory, or somewhere else — and then moved to where you will use it, an L&I insignia is required.” Source: Washington State Department of Labor & Industries, read 2026-11-03.

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