How to Check a Contractor's License in Seattle, WA

Seattle is one of the more complex cities for contractor verification because it layers Washington State's L&I registration system with the City of Seattle's own additional contractor registration requirements. A contractor working legally in Tacoma may not be authorized to work in Seattle without the city registration. Here is how the full system works and what to verify before hiring.

Washington State requires contractor registration through Labor & Industries (L&I), and Seattle adds its own layer. Missing either one leaves you exposed. Getting both checks right takes only a few minutes once you know where to look.

How does Washington State require contractors to register?

Washington State does not issue traditional contractor licenses — it requires contractor registration through the Department of Labor & Industries (L&I). Registration requires a surety bond (ranging from $6,000 to $12,000 depending on classification) and proof of general liability insurance. L&I's online verification system at verify.lni.wa.gov lets you search any contractor by name or registration number to confirm active status, bonding, and insurance.

• Washington L&I contractor registration: verify.lni.wa.gov
• Bond required: $6,000 to $12,000 depending on contractor classification
• General liability insurance required at registration
• Search returns registration status, expiration, bond amount, and insurer
• Confirm status is “Active” before proceeding with any contractor

What additional registration does Seattle require?

The City of Seattle requires contractors to obtain a Seattle contractor registration through Seattle's Department of Construction and Inspections (SDCI) at seattle.gov/sdci, in addition to Washington State L&I registration. This Seattle-specific registration is required for contractors performing work within Seattle city limits. Without the city registration, even a fully compliant L&I-registered contractor cannot legally work in Seattle.

• Seattle SDCI registration: seattle.gov/sdci
• Required in addition to Washington State L&I registration
• Applies to contractors working within Seattle city limits
• Ask contractors for both their L&I registration number and Seattle registration number
• Contractors with only state registration may be non-compliant for Seattle projects

How do I verify both Washington State and Seattle registrations?

Verifying a Seattle contractor requires two separate lookups. First, run the contractor name or registration number through the L&I lookup at verify.lni.wa.gov. Second, verify their Seattle city registration through SDCI at seattle.gov/sdci. A contractor who is active on both systems is properly credentialed for Seattle work. Missing either registration is a disqualifying red flag.

• Step 1: verify.lni.wa.gov — confirm Washington State registration is Active
• Step 2: seattle.gov/sdci — confirm Seattle city registration is active
• Both searches are free and publicly accessible
• Note expiration dates on both registrations — confirm they cover your project period
• L&I search also shows bond amount and insurance provider

What permits does the City of Seattle require for contractor work?

SDCI at seattle.gov/sdci issues building, electrical, mechanical, and plumbing permits for work within Seattle city limits. A registered contractor must pull the appropriate permit before beginning work. Seattle has a permit search tool that allows homeowners to look up permit history by address or contractor, providing a useful check of whether a contractor consistently pulls permits for their Seattle projects.

• Seattle permits: seattle.gov/sdci/permits
• Building permits required for structural, addition, and significant renovation work
• Separate permits for electrical, plumbing, and mechanical work
• Search permit history to verify a contractor's Seattle track record
• Contractors who avoid permits cannot pass mandatory SDCI inspections

What trades are separately licensed in Washington State?

Beyond contractor registration, Washington State licenses specific trades. Electricians must hold an electrical contractor license or journeyman/apprentice license from L&I. Plumbers must hold plumber licenses from L&I. These are separate from the general contractor registration and should be verified independently for any specialty trade work. Seattle's electrical requirements are particularly strict given the city's commercial and residential density.

• Washington electrical contractor license: verify through L&I at verify.lni.wa.gov
• Washington plumber license: also through L&I lookup
• Both trade licenses must be active in addition to contractor registration
• Seattle electrical work requires both state license and Seattle permit
• Confirm trade license classifications match the scope of work

What are the consequences of hiring an unregistered contractor in Seattle?

Washington State takes unregistered contractor activity seriously. Working without L&I registration is a gross misdemeanor. Seattle SDCI adds city-level enforcement for contractors working without the required city registration. According to L&I data, Washington State processes thousands of unregistered contractor complaints annually. Homeowners who use unregistered contractors lose the protection of the state bond, lose the L&I complaint process, and may be liable for workers' compensation if uninsured workers are hurt on site.

• Unregistered contracting in Washington: gross misdemeanor
• Seattle adds city-level penalties for missing city registration
• No L&I or SDCI complaint process for unregistered contractors
• Homeowner may face workers' comp liability for uninsured workers
• L&I bond protection is only available when contractor holds valid registration

Is there a faster way to verify a Seattle contractor?

Running two separate registration checks, verifying trade licenses, and checking permit history makes Seattle one of the more time-intensive cities for contractor verification. CheckLicensed.com consolidates official Washington State and Seattle records into one fast lookup for just $0.99 per check — so you can quickly confirm both credentials before hiring.