Permit References

Helpful resources for understanding deck permit requirements across the Greater Seattle area.

Do I Need a Permit for My Deck?

In most cases, yes. The Pacific Northwest's wet climate makes proper construction and inspections critical for safety and longevity. While specific rules vary by jurisdiction, here are the general guidelines:

Quick Reference

Seattle: Permit required if deck is more than 18 inches above grade
Most other cities: Permit required if deck is more than 30 inches above grade
All areas: Roof decks and decks over living spaces typically require permits
Attached decks: Usually require permits regardless of height if serving as required egress

Even when a building permit isn't required, zoning rules still apply. You'll need to verify setbacks, lot coverage limits, and any environmental restrictions that may affect your project.

Why Permits Matter

Safety: Proper footings, connections, and guards reduce failure risk in our rain-heavy climate
Resale value: Permitted work avoids red flags during home sales and inspections
Insurance: Unpermitted structures can complicate or void insurance claims
Code compliance: Ensures materials and hardware are appropriate for PNW weather

City & County Resources