- Shed permit Seattle
- Shed under 200 square feet
- Do I need a permit to build a shed in Washington
- Backyard office permit King County
- Seattle zoning for sheds
Shed Permit: Adding a shed to your property in Seattle or surrounding areas like Tacoma, Bellevue, or Lynnwood may seem like a straightforward upgrade—but before the first nail is driven, many homeowners find themselves asking, Do I need a Shed Permit to build a shed in Seattle?
The answer depends on size, location, and usage. In this guide, we’ll break down the most important permit rules in Seattle and King County, explain what you can build without a permit, and help you avoid costly setbacks.
Shed Permit Basics: The 200 Square Foot Rule
In Seattle and most surrounding municipalities, you can build a shed up to 200 square feet without a Shed Permit, as long as it meets other zoning and building code requirements.
According to the Seattle Department of Construction and Inspections (SDCI), no permit is required for accessory structures that are:
- Detached from the primary residence
- Under 200 square feet in area
- Less than 12 feet in height
- Do not include plumbing
- Not used as a dwelling or sleeping unit
This means that a 12×16 or 10×20 shed used as an office, workshop, or studio can typically be built without formal approval—if other conditions are met.
✅ Tip: Always confirm dimensions from exterior wall to wall. Eaves, overhangs, and decks can sometimes push you over the threshold.
Zoning Rules Still Apply (Even Without a Permit)
Even if your shed is under 200 square feet, you still need to follow Seattle’s zoning rules. Common requirements include:
- Setbacks: In most zones, your shed must be at least 5 feet from side and rear property lines. Some lots may require more.
- Lot coverage limits: Your property can only have a certain percentage of structures.
- Easements: You can’t build over utility easements, drainage paths, or steep slopes.
- Use restrictions: Sheds can’t be used for full-time living or overnight stays.
Special Considerations for Shed Permit in King, Snohomish, and Pierce Counties
While the 200 sq. ft. exemption applies across much of Washington, specific rules vary slightly by county:
- King County: Similar rules as Seattle, but you may need a site plan and setback documentation even for unpermitted sheds.
- Snohomish County: Requires a “No Permit” declaration for structures close to 200 sq. ft.
- Pierce County: Less restrictive in rural zones, but setbacks and lot coverage limits are enforced strictly in city limits.
It’s always smart to check with your local building or planning department before construction. Many offer free site evaluations or zoning lookups online.
When You DO Need a Shed Permit
You will need a building permit if:
- Your shed is over 200 square feet
- It’s attached to your house
- It includes plumbing, electrical, or HVAC (even if under 200 sq. ft.)
- It’s being used as a dwelling or ADU (accessory dwelling unit)
- It exceeds 12 feet in height
For example, if you’re planning to run electrical wiring to power lights, outlets, or heating inside your backyard office, you’ll need a separate electrical permit from the Washington State Department of Labor and Industries (L&I).
⚠️ Note: Unpermitted structures may be flagged during home sales or insurance inspections. Always build to code—even if a permit isn’t required.
How to Build Smart and Avoid Permits
Most homeowners opt for a shed under 200 sq. ft. to skip the red tape. But size alone isn’t enough. Here’s how to build smart:
- Stick to 12×16, 14×14, or 10×20 footprints
- Keep total height under 12 feet
- Place the shed at least 5 feet from fences and property lines
- Avoid plumbing unless you’re prepared to permit it
- Get electrical work done by a licensed electrician with the right L&I permit
If you’re working with a reputable local builder, they should walk you through these steps. Some may even handle site plan creation or contact your local planning department on your behalf.
Why Homeowners Are Choosing On-Site Built Sheds
While large retailers like Home Depot and Tuff Shed offer prefab options, Seattle-area homeowners are increasingly choosing custom, built-on-site sheds. The terrain, access limitations, and wet weather make local construction more practical—and more personalized.
Professionally built backyard sheds from Cipro Contractors and Near East Sheds, under 200 sq. ft. provide:
- Permit-free construction
- Durable materials suited for Northwest weather
- Custom window, siding, and trim options
- Optional insulation and electricity
- Short build timelines—usually under two weeks
These structures are increasingly being used as home offices, design studios, or therapy spaces, offering year-round functionality and long-term value.
Final Thoughts
So, do you need a permit to build a shed in Seattle? In most cases, no—as long as you stay under 200 square feet and follow basic zoning rules. But that doesn’t mean you should cut corners.
Plan your site layout carefully, know your setbacks, and work with professionals who understand Washington’s building codes. Whether you’re creating a quiet backyard workspace or adding functional square footage to your property, taking the right steps upfront ensures your project is both legal and lasting.
