Washington State is a dream destination for those seeking simple, sustainable living close to nature. But one of the biggest questions people ask before investing in a Tiny Home on Wheels (THOW) is: Where can I legally park it?
The answer depends on how your home is built and how you plan to use it. Below, we break down what the law says, how it’s enforced, and the options available to you as a tiny homeowner in Washington.
Tiny Homes Built to the RV Code
Most THOWs are built to RV industry standards (NFPA 1192 or ANSI A119.5). That means they’re inspected like recreational vehicles and registered with the DMV—not like permanent houses.
Key Rules for RV-Style Tiny Homes
- 6-Month Rule: In Washington, tiny homes built to the RV standard can be lived in for up to six months of the year on a single property.
- Short-Term Uses Allowed: If your tiny home is a guest suite, rental cabin (Airbnb/VRBO), or backyard office, you’re in the clear. The rule only applies to permanent residency.
- Not Intended for Full-Time Housing: Long-term residential use is restricted under zoning laws.
Enforcement in Practice
The reality? Enforcement is typically complaint-based. Cities and counties rarely go hunting for people living in tiny homes. The risk usually arises if a neighbor files a complaint or if your setup is highly visible in a residential neighborhood.
Strategies RV Tiny Home Owners Use
- Stay Discreet: Place your THOW on a private property, tucked behind trees or fencing.
- If you are living in a more visible place, keep things clean and tidy. Don’t let junk or vehicles accumulate around the tiny home.
- Good Neighbors = Fewer Problems: If the people next door are on your side, you’re less likely to face complaints.
- Stay Mobile: In a pinch, you can move your THOW, which often satisfies inspectors.
Note: This isn’t legal advice. Zoning and enforcement vary by county. Always confirm with your local planning department if you want a definitive answer.
Tiny Homes Built to the International Residential Code (L&I Inspected)
Washington is one of the few states that has a separate definition of “tiny house” under the residential code, enforced by the Department of Labor & Industries (L&I). These tiny homes are built like traditional houses, following the International Residential Code (IRC)—including Appendix Q, which covers homes under 400 sq. ft.
What Sets Them Apart
- Higher Insulation Standards: You’ll meet Washington’s strict energy code for year-round living.
- Licensed Trades Required: All electrical and plumbing work must be completed by licensed professionals.
- More Expensive: The higher labor and material standards add to the cost.
Why Choose This Route?
- Permanent Residence: These homes can be placed legally as your full-time dwelling.
- Financing & Insurance Friendly: Easier to insure, finance, and sell than RV-style THOWs.
- Built to Last: Stronger construction, designed for true four-season living in Washington’s climate.
Which Type of Tiny Home Fits You Best?
Tiny Home on Wheels built to the RV standard
Perfect if you value flexibility, affordability, and mobility. Great for seasonal living, rentals, or as an extra space.
Tiny Home on Wheels built to the residential code
The choice if you want permanence, compliance, and the peace of mind of a fully legal home.
We’ve got you covered
But don’t worry—you’re in luck! At Mount Baker Tiny Homes, we build both types of tiny homes. They are essentially the same in look and layout. The higher level of insulation is the only real difference. Both are inspected by the L&I, but each requires it’s own plan set and it’s own inspection process. Here’s a simple handle for remembering the options:
RV Tiny Home = Recreational and Flexible, built to the RV code.
IRC Tiny Home = Residential and Permanent, built to the International Residential Code
No matter your lifestyle or long-term plan, we can help you find the right fit for living tiny in Washington State.
More info
How to Set Up Utilities for Your Tiny Home on Wheels.