Seattle, Washington Building Permit FAQ
Answers to the most frequently asked building permit questions for Seattle, Washington. Based on data from the Seattle Development Services Department.
Do I need a building permit in Seattle?
Building permit requirements in Seattle, Washington depend on the project type and size. Sheds over 120 sq ft typically require a permit. Attached decks almost always require a permit. Pools require permits in virtually every city. Use our free permit quiz to check your specific project.
How much do building permits cost in Seattle?
Permit fees in Seattle vary by project: Shed: $100-$300, Fence: $50-$150, Deck: $125-$400, Pool: $250-$650. Use our cost estimator for detailed estimates.
What size shed can I build without a permit in Seattle?
In Seattle, sheds under 120 sq ft typically do not require a building permit. Setback rules (5ft from side lines) still apply. View full Seattle shed rules.
Do I need a permit for a fence in Seattle?
In Seattle, fence permit requirements are conditional based on height and location. Height limit: 6 ft. View full Seattle fence rules.
Do I need a permit for a deck in Seattle?
In Seattle, deck permit requirements depend on the project specifics. Fees: $125-$400. View full Seattle deck rules.
Do I need a permit for a pool in Seattle?
Seattle requires building permits for all swimming pool construction. Fees range from $250-$650. Separate electrical and plumbing permits are also required. View full Seattle pool rules.
Do I need a permit for a pergola in Seattle?
In Seattle, pergola permits depend on roof type, size, and attachment. Structures over 200 sq ft need a permit. View full Seattle pergola rules.
What happens if I build without a permit in Seattle?
Building without a required permit in Seattle can result in fines of $200-$10,000+, stop-work orders, required demolition, retroactive permits at double cost, home sale complications, and insurance claim denials. Read the full guide.