Do I Need a Permit to Build a Fence? A Homeowner’s Guide for Seattle and Portland
Thinking about building a new fence? Whether you’re upgrading for privacy, security, or curb appeal, one of the first questions that comes up is: Do I need a permit to build a fence? If you’re in the Seattle or Portland metro areas, the answer depends on a few key factors—especially fence height, location, and local zoning laws. Getting it wrong can cost you time, money, and peace of mind.
At Cool Cat Fence, we know permits and city codes can feel like a headache. That’s why we’re here—to break it down clearly and help you stay compliant from day one. In this guide, we’ll walk you through what’s required (and what’s not), what to watch out for, and how we help homeowners like you build fences that meet all local standards without the stress.
Why a Building Permit Might Be Required for Your Fence
A building permit is official approval from your city or local government to construct a structure like a fence, deck, or patio cover. For residential projects, permits ensure your fence won’t create safety issues, violate setbacks, or encroach on neighboring property. Even if your fence doesn’t need a permit, it still has to comply with building codes and zoning regulations.
Skipping the permit process might seem like a shortcut, but it can lead to fines, stop-work orders, or even having to tear down your newly built fence. The cost of a permit fee is minor compared to the hassle of non-compliance. Cool Cat Fence walks you through whether your proposed fence needs a permit—and if it does, we handle the paperwork and approvals for you.
Fence Installation Rules in Seattle
Fence Installation That Doesn’t Require a Permit
In Seattle, you can install a fence without a building permit if:
It’s 6 feet tall or shorter
It’s located in a backyard or side yard
It’s not attached to or built on top of a retaining wall
These types of fence installations fall under the city’s general guidelines for residential construction. While no permit is needed in these cases, the fence must still follow setback rules and other local zoning laws.
When Fence Installation Requires a Building Permit
You’ll need a permit in Seattle if your proposed fence:
Is taller than 6 feet
Is in the front yard and over 4 feet tall
Is part of or built on a retaining wall
Affects visibility on a corner lot
Seattle’s permit requirements are strict about sightlines and pedestrian safety. In many cases, the permit application must include a plot plan showing exactly where the fence will go and how it complies with the zoning code.
Understanding Seattle’s Local Zoning Laws
Seattle’s zoning code includes many layers—like environmental overlays, shoreline districts, and historic zones—that may impose additional restrictions. If your home is in one of these areas, you may need plan review or input from a design professional before approval.
Check out our guide on how to choose the right fence for your Seattle property for more tips on code-compliant design.
Portland Fence Installation Requirements
When You Don’t Need a Building Permit in Portland
Portland gives homeowners a bit more flexibility. A permit is not required if:
The fence is 7 feet or less in height
You’re replacing an existing fence in the same spot and at the same height
This makes it easier to upgrade worn-out fencing or swap out materials (for example, going from chain link to wood) without involving the city—though the fence still needs to meet height and location standards under Portland’s building codes.
When a Building Permit Is Required in Portland
In Portland, you’ll need to submit a permit application if:
The fence exceeds 7 feet in total height
You’re building a front yard fence taller than 3.5 feet
The fence is near a driveway or street corner and affects traffic visibility
The fence is being built on a retaining wall, raising the overall height
Also keep in mind that in conservation or historic zones, specific requirements may apply even if the fence height is within standard limits. In those cases, you may be required to submit an application form, plot plan, and even a consultation with a design professional.
Local Zoning Laws and Overlays in Portland
Some neighborhoods fall within overlay zones that have stricter rules to protect scenic views, trees, or neighborhood character. For these residential projects, a plan review by the city is often required. Cool Cat Fence works directly with the Portland Bureau of Development Services to ensure every project we manage obtains all necessary permits quickly and accurately.
Working With an Existing Fence: What You Need to Know
Replacing or modifying an existing fence is often easier than building something brand-new, but it still needs to comply with city codes. If you’re increasing the height, relocating the fence line, or upgrading to heavier materials like concreteposts or stone columns, a permit may be required.
In some cases, if your existing fence was installed before current zoning rules, it may be considered “nonconforming,” and changes to it might trigger new requirements. We help you figure that out before construction starts.
Property Lines, Shared Fences, and the Importance of a Boundary Survey
Washington’s Fence Rules and Neighbor Agreements
Washington’s “Good Neighbor” fence law encourages neighbors to share the cost of fences built on shared boundaries. Before construction, talk to your neighbor, especially if the proposed fence will sit directly on the property line.
To avoid disputes, we recommend getting agreements in writing and, when possible, confirming property boundaries through a boundary survey. In some cases, a professional survey is the only way to determine the exact line—especially in older neighborhoods.
Oregon's Approach to Shared Fences
Oregon law doesn’t mandate cost-sharing but follows similar principles. If the fence is going to be shared, agreements are best made in advance. As with Washington, we recommend a boundary survey before any fence installation, particularly in tight urban lots or hilly terrain.
Building Codes and What Happens If You Skip the Permit
Just because you don’t need a permit doesn’t mean you’re free and clear. Your fence must still follow local building codes, which cover everything from structural strength to visibility. For example, a fence must be able to resist wind loads—especially taller fences and those with patio covers or gates attached.
If you skip the permit process when one is required, you risk having your project shut down. The city can issue violations, require expensive fixes, or even order removal. Additionally, when selling your house, unpermitted work can delay or derail the process.
Skipping a $100–$300 permit fee isn’t worth the long-term cost.
How Cool Cat Fence Makes Fence Installation Easy and Compliant
We Handle Building Permits from Start to Finish
Our experienced team handles the entire permit application process for you. We’ll prepare the plot plan, fill out the application form, and work with your local government to obtain all the necessary permits—no guesswork required.
Code-Compliant Fence Design That Looks Great
We work closely with you to design a fence that fits your style, your yard, and the law. Whether you’re going with wood, metal, or chain link, we make sure every detail is up to code—from post spacing to minimum setback.
Construction Backed by Local Knowledge
When it’s time to build, our crews follow strict construction standards and meet every inspection checkpoint required by the city. If your project involves overlays, visibility restrictions, or special conditions, we ensure your fence will pass final inspections the first time around.
Want a behind-the-scenes look at how we work? Visit our fence installation process page.
FAQs About Fence Permits and Local Rules
Do I need a building permit for a front yard fence?
Usually, yes. Seattle allows up to 4 feet, and Portland allows up to 3.5 feet in front yards without a permit. Anything taller will require a permit application and plan review.
What if my fence is exactly 6 feet?
In Seattle, 6 feet is the maximum without a permit. Portland allows up to 7 feet. Any taller and you’ll need to file a permit application.
Can I build a fence directly on the property line?
Only if both neighbors agree in writing. Otherwise, the fence must be built inside your property boundary. A boundary survey can protect both sides and prevent disputes down the road.
How long does it take to get a permit?
It depends on your city and the scope of the project. A basic fence permit may take a few business days, but complex projects could take a couple of weeks due to zoning, overlays, or design professional review.
What about replacing an existing fence?
If the existing fence is staying the same in height and location, you likely don’t need a permit. But changes in height, material, or placement might trigger new permit requirements.
Key Takeaways: Fence Permits in Seattle & Portland
Always check your city’s building codes and local zoning laws before starting any residential fencing project
A building permit is often required for fences that exceed allowed height or affect public safety
Replacing an existing fence may not require a permit—but verify before starting
A boundary survey is your best protection if you’re unclear about property lines
Cool Cat Fence handles the entire permit application process, from paperwork to inspections
Ready to Build a Fence That’s Stylish, Strong, and 100% Compliant?
Whether you’re planning a decorative wood fence, a secure chain link perimeter, or upgrading an older design, Cool Cat Fence is here to make the process simple. We take care of permits, construction, and compliance—so all you need to think about is how good your new fence will look.
Get your free estimate today and let’s build a fence that checks every box.
