Washington building departments

How permitting works in Washington

Statewide code, city and county enforcement. Washington's state building code applies everywhere, and cities and counties enforce it with limited local amendments. Electrical permits come from Labor & Industries unless the city runs its own electrical program.

A county name is only a geographic starting point. Depending on the address, a city, town, borough, township, or county office may issue your permit. How to check who issues your permit.

Washington building codes and licensing

Residential code

2021 IRC with Washington amendments (WAC 51-51), effective March 15, 2024; 2024 codes are scheduled to take effect May 3, 2027

Commercial code

2021 IBC with Washington amendments (WAC 51-50), effective March 15, 2024; 2024 edition scheduled for May 3, 2027

Adopted by

Washington State Building Code Council (opens in a new tab)

Outside city limits

Counties enforce the state building code outside city limits; a county or city without a building department must contract with another jurisdiction or an approved inspection agency (RCW 19.27.050).

Contractor licensing

Construction contractors must register with L&I, post a $30,000 bond (general) or $15,000 bond (specialty), and carry liability insurance. Electrical, plumbing, elevator, boiler, mobile home installation, and asbestos work need separate L&I licenses or certifications. Washington Department of Labor & Industries (L&I) (opens in a new tab)

What is different in Washington

• L&I issues electrical permits and does inspections except in cities that run their own electrical inspection program to an equal or higher standard (RCW 19.28.141).
• Whoever performs electrical work must buy the permit; a contractor cannot have the homeowner buy it. Inspections must be requested within 3 business days of completion or 1 business day after energizing.
• The Washington State Energy Code is a state-written code, not an adopted model code.
• Washington uses the Uniform Plumbing Code rather than the International Plumbing Code.

Washington department guides

Browse Washington counties

Bold counties have at least one researched department guide.

Planning a project in Washington?

Start with what the model codes say, then confirm local rules with the department that serves your address.

• Do I Need a Permit for a Deck
• Do I Need a Permit for a Fence
• Do I Need a Permit for a Shed
• Do I Need a Permit to Replace a Roof
• Do I Need a Permit to Replace a Water Heater
• Do I Need a Permit for a Kitchen Remodel
• How Much Does a Building Permit Cost
• Building Inspection Stages Explained

Sources

1. Washington State Building Code Council / local jurisdictions
2. Washington SBCC – Home and 2024 code adoption announcements
3. Washington Legislature – WAC 51-51-003 International Residential Code
4. Washington Legislature – WAC 51-50-003 International Building Code
5. Washington Legislature – RCW 19.27.050 Enforcement
6. Washington Legislature – RCW 19.28.141 Electrical inspection in certain cities
7. Washington L&I – Register as a Contractor
8. Washington L&I – Electrical Permit Basics

State facts checked October 21, 2026. Local amendments can change these rules; the department serving your address has the final word.