What are Rules and Regulations for Washington Tiny Homes?

Washington tiny home living is a big deal in Washington State. People here really enjoy living in small houses with a solid foundation. This is because of the rules for ADUs (Accessory Dwelling Units) in many areas.

Washington Tiny Homes

However, rules can vary from place to place. For example, in Woodland, you can have ADUs between 300 and 800 square feet. But in King County, tiny houses must have a foundation.

Despite the love for tiny homes, there are some legal restrictions. These rules determine where you can build and how big your tiny home can be.

Zoning laws and building codes are the ones that set these restrictions. In this article, you will learn all about the rules for tiny homes in Washington State.

Keep reading to discover everything you need to know for a fantastic tiny living experience.

Are Tiny Homes Legal in Washington?

In Washington State, tiny homes are allowed, but there are rules you need to follow. These rules, or regulations, can vary depending on where you live. However, it’s important to note that parking your tiny house on wheels (THOW) anywhere in the state is against the law.

For instance, in King County, tiny homes must be built on a permanent foundation.

  • In Woodland, there are regulations specifying that ADUs must fall within the size range of 300 to 800 square feet.
  • In Seattle tiny homes are considered as ADUs, and regulations prohibit THOWs.

Which Counties in Washington Permit Tiny Houses?

Washington is known as one of the tiny-house-friendly states in the US. The rules for living in small homes are usually pretty relaxed here. However, these rules can change depending on where you are in the state. For instance, in Woodland, you’re allowed to have ADUs that range from 300 to 800 square feet.;

Washington Tiny Homes


But, it’s important to know that regulations are not lenient for people who want to park their Washington Tiny Home on wheels. So, while Washington is generally welcoming to tiny homes, there are strict rules about where you can put them.

Is it Possible to Permanently Reside in a Tiny House in Washington State?

In Washington, you can live in a tiny home all the time. But before you build one, it’s important to talk to the people at your local building department. They can tell you if your tiny house follows all the rules in the Washington State Building Code.

If you want to live in a tiny house on wheels forever, it’s important to build it strong. But here’s the thing: in Washington, you’re not allowed to stay in a licensed RV parked in one spot for more than 180 days.

Rules and Regulations for Tiny Houses in Washington

Rules and regulations for tiny homes can be different depending on where you are in Washington State. Many people like tiny homes with a foundation because of the rules for ADUs in some places. But, the rules are strict if you want to park a tiny house on wheels.

Washington Tiny Homes

In King County, tiny house owners have to build their houses on strong, permanent foundations. You can’t park tiny houses on wheels there it’s against the rules. Seattle has similar rules; they don’t allow tiny houses on wheels either. All tiny homes have to follow the requirements for an ADU and must be registered for that purpose.

In Woodland, all ADUs must have a living area that’s between 300 to 800 square feet. So, depending on where you are in Washington, the rules for tiny homes can be different.

Guidelines for Temporary Tiny Dwellings

In Washington State, if you have a tiny house with wheels, it’s called a park model recreational vehicle. But you can only use it temporarily. You can’t stay in these homes for more than 180 days in the same spot.

Regulations for Permanent Buildings

Tiny homes built to stay in one place have to follow the rules in the Washington State Building Code. They can’t be bigger than 400 square feet.

Washington Tiny Homes

Where Can I Build a Tiny House in Washington?

In Washington, there are rules about where you can put tiny homes on wheels. You can only park them in certain places, like a mobile home/RV park or in limited planning areas. But for other tiny homes, you have more options. You can build them in a tiny house community, on residential land, or even on agricultural property.

These rules, called zoning and development regulations, might have certain requirements. They might say your tiny home has to be a certain size or have a specific place to park.

There’s also a limit on how many tiny homes you can have on one piece of land, and rules about how many people can live in them.

What is the Minimum Size Requirement for Houses in Washington?

In Washington tiny home can be really small, like 400 square feet or even less. You can build it on wheels and include a sleeping/living area, a kitchen, and a bathroom. But here’s the catch: all tiny homes in Washington have to follow the Washington State Building Code.

Washington Tiny Homes

Now, if you want to build one of these tiny homes, there’s a process to follow. Here’s what you need to do:

First, make sure you know all the rules your tiny house needs to follow. You can find all this information in the tiny house information packet. It tells you how to plan, design, and build your tiny home.

Next, you’ll need three copies of your plan signed by an architect or a Washington professional engineer (PE). Then, you’ll need to fill out some applications:

  • Tiny House Plan Approval & Insignia Request form (F623-039-000). This form helps you get the L&I inspector insignia for your tiny home. It’s the basic application, and it’s helpful when dealing with your local building department.
  • Notification to Local Enforcement Agency (F623-013-000). Once L&I approves your plan, you’ll need to send a copy of it to the local building department along with this application.

Must I Pay Property Taxes for My Tiny House?

In Washington, if you have a tiny home, you don’t usually have to pay property taxes like you would for regular, big houses called conventional homes. But if your tiny home has wheels, it might be seen as a recreational vehicle (RV) in many states. That means you might have to pay personal property taxes like you would for a mobile home.

It’s good to remember that rules for motor vehicles can be different in each state. So, depending on where you live, you might have to pay taxes for your tiny home if it’s on wheels.

Where Can a Tiny Home Be Placed in Washington?

In Washington, if you have a tiny home, you can park it in different places. These include a tiny house community, an RV campground, a regular residential area, or a farm. Tiny homes on wheels are considered like RVs. So, you can only park them at an RV campground.

RV Campground

If your tiny home in Washington is certified as an RV or RVIA, you can park it at an RV campground. But not all RV parks accept tiny houses, and not all tiny house communities accept RVs.

Besides certification, your tiny home can also park at an RV campground if it’s the right size. But remember, many national parks don’t allow rigs longer than 42 feet to park overnight.

Tiny House Community

Washington Tiny Homes

Tiny homes are becoming popular in Washington thanks to the efforts of pioneers in the micro-house movement. These pioneers have been working to legalize tiny houses. They include landowners from various backgrounds who lease spaces to microhouse dwellers.

Most of these communities prioritize sustainability and may have a garden. Some resemble typical campgrounds, while others offer more privacy and seclusion to microhouse dwellers.

On Residential Land or Agricultural Property

When you’re deciding where to park your tiny home in Washington, a residential area might be your first thought. But be cautious because rules can differ in various towns. Before settling your micro house there, it’s essential to do thorough research.

You might also consider finding a spot in a friend’s backyard or renting space from someone who wants extra income. While it may not seem like a permanent solution, living in a residential area could be suitable for a while if local authorities approve.

However, if you’re in a state where tiny homes aren’t welcomed, parking in agriculturally zoned areas might be a better option. Many farmers have RVs or small living spaces for their workers, and they usually face no issues because nobody bothers them.

Regulations vary depending on your location. So, it’s crucial to confirm whether you can park a tiny house in your backyard. Additionally, the type of tiny house you want to build matters. If it’s on your property, neighbors might initially object.

Before starting construction, it’s wise to communicate with your neighbors and ensure they’re comfortable with it.

Existence of Tiny House Communities in Washington

In Washington, lots of tiny house residents live close to each other. This leads to many thriving tiny home communities, and more keep popping up over time.

When you’re looking for a spot for your tiny home, it’s essential to consider the local state laws. Even though your tiny home can move, finding the right community can be tricky. That’s why it’s important to understand the laws in your area before making a decision.


Living in a tiny home has many benefits. They’re easy to take care of and less expensive to maintain. But sometimes, it can be difficult because of local zoning laws. People who live in tiny homes might face legal problems, especially in areas where there are strict rules about them.

In Washington State, there are regulations about the size of tiny homes. They can’t be larger than 400 square feet. If you want to have a permanent tiny home, it must meet the requirements of the Washington State Building Code. Tiny houses with wheels are known as park model recreational vehicles, but they can only be used temporarily.

Washington is known for being friendly to tiny homes. There are many great communities here. So, if you’re considering getting a tiny home, Washington might be the perfect place for you.

Washington Tiny Home for sale in Washington State offer diverse options for those seeking a compact and sustainable lifestyle.

Frequently Asked Questions

Are there Many Tiny Home Communities in Washington State?

Yes, Washington Tiny Home communities are numerous, where residents live close to each other, fostering thriving communities, and new ones continue to emerge over time.

Who are the Tiny Home Builders in Washington State?

In Washington State, Washington Tiny Home builders abound, offering a diverse range of designs and services to cater to the growing demand for tiny house living in the region.

What are the Washington Tiny Home Laws?

Washington Tiny Home laws encompass regulations on construction, placement, and occupancy, ensuring compliance with building codes and local land use regulations.

Is there a Washington Tiny House Association?

Yes, the Washington Tiny House Association exists, serving as a resource and community hub for tiny house enthusiasts in the state.

Where Can I Find Washington Tiny Home Kits?

Washington tiny home kits can be found through various suppliers and manufacturers, offering customizable options for building your own tiny home in the state.

Who are the Tiny Home Builders in Seattle?

Several tiny home builders in Seattle offer a variety of designs and services to meet the demand for tiny house living in the city.



I'm Sehrish Kiran, a standout researcher in houses, cabins, and cottages. Mine expertise combines a refined design sense with a profound understanding of architectural intricacies. Mine concise and captivating insights set me apart, making me an influential voice in residential architecture.

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