How to Verify a Washington Contractor's License

Washington State requires contractor registration as a precondition for performing construction work — residential, commercial, and specialty trades alike. Verifying that registration status before hiring or subcontracting protects property owners, general contractors, and public agencies from uninsured liability exposure and unenforceable contracts. The Department of Labor & Industries (L&I) maintains the official registration database, and any verification performed outside that system carries no legal weight. This page covers the verification mechanism, the data elements that verification reveals, and the decision logic for acting on results.

Definition and scope

Contractor verification in Washington is the process of confirming that a business entity holds an active registration issued by the Washington State Department of Labor & Industries under the Contractor Registration Act (RCW 18.27). Registration — not licensing in the traditional sense — is the operative credential for most contractor categories in Washington. Specialty trades such as electrical, plumbing, and elevator mechanics carry additional journey-level or administrator licenses administered separately; verification of those trades requires checking both registration status and the relevant specialty license.

The verification record surfaces four core data points:

  1. Registration number — the unique identifier assigned at registration
  2. Active/inactive status — whether the registration is currently valid
  3. Bond information — the name of the surety and bond amount on file
  4. Insurance on file — the carrier and policy period for general liability coverage

Registration alone does not confirm that a contractor carries workers' compensation coverage for employees; that check runs through a separate L&I inquiry. For a full breakdown of credential types, see Washington Contractor License Types.

Scope limitation: This page applies exclusively to Washington State contractor registration under RCW 18.27. It does not address contractor licensing requirements in Idaho, Oregon, or any other jurisdiction. Federal contractors operating under procurement regulations — covered in part at Washington Public Works Contractor Requirements — may carry additional certifications outside L&I's scope. Sole proprietors performing work only on their own property are also not covered by this verification framework.

How it works

The primary verification tool is the L&I Contractor Verify portal at verify.lni.wa.gov. The system accepts searches by business name, UBI number, or contractor registration number. Results return in real time and reflect the registration database as of the query date.

Step-by-step verification process:

  1. Navigate to the L&I Contractor Verify portal.
  2. Enter the contractor's business name, UBI number, or registration number.
  3. Review the status field — active registrations display an expiration date; lapsed or suspended registrations display their inactive status and the reason.
  4. Confirm the bond amount meets the project threshold. Under RCW 18.27.040, general contractors must carry a $12,000 bond; specialty contractors must carry a $6,000 bond.
  5. Confirm general liability insurance is on file and the policy period covers the project dates.
  6. For electrical, plumbing, or other specialty trades, cross-reference the appropriate specialty license database — electrical licenses are held in the L&I Electrical Program lookup, separate from the general contractor registration system.

Verification results can be printed or saved as a timestamped record. L&I's system does not generate a certified verification letter; documentary records for contracts or public bids require a screenshot with the date and time of the query. Additional context on how registration intersects with bond requirements is available at Washington Contractor Bond Requirements.

Common scenarios

Residential hiring: A homeowner contracting for a roof replacement confirms the roofing contractor's registration at verify.lni.wa.gov before signing. An inactive registration on the verification date means the contractor cannot legally perform the work and the homeowner has no bond recourse if the work is defective. See Washington Roofing Contractor Services for trade-specific considerations.

General contractor vetting subcontractors: Under RCW 18.27.114, a general contractor who hires an unregistered subcontractor may assume liability for that subcontractor's workers. Verification before engagement creates a documented record of due diligence. The subcontracting relationship is detailed further at Washington Contractor Subcontractor Rules.

Public agency procurement: Public works contracts in Washington require registration verification at bid opening and again at contract award. An unregistered contractor's bid is non-responsive under RCW 39.06.010. Procurement officers typically capture a timestamped verification screenshot as part of the bid file.

Post-complaint verification: After a complaint is filed, L&I may suspend a contractor's registration pending investigation. A registration that was active at hiring may become inactive mid-project. Parties monitoring active projects should re-verify at project milestones. The complaint process is described at Washington Contractor Complaint Process.

Electrical and plumbing verification contrast: A general contractor registration does not authorize electrical or plumbing work. A business registered as a general contractor performing electrical rough-in without a separate electrical contractor registration is operating outside its credential scope. Electrical verification uses L&I's Electrical Contractor License lookup; plumbing verification uses the Plumbing Program records — both distinct from the general contractor registration database. See Washington Electrical Contractor Services and Washington Plumbing Contractor Services.

Decision boundaries

Active with valid bond and insurance → proceed. The contractor meets minimum statutory registration requirements. Due diligence may still include checking for open violations at Washington Contractor Violations and Penalties and confirming workers' compensation coverage through a separate L&I query.

Active registration, lapsed bond → do not proceed. An active registration status with an expired or lapsed bond means the contractor is technically non-compliant with RCW 18.27.040. L&I's system may show a grace window, but contracting during a lapsed bond period removes the bond protection mechanism.

Inactive registration → do not proceed. Any contract signed with an unregistered contractor is unenforceable by the contractor under RCW 18.27.080, and the property owner loses bond recourse. This is the primary financial protection that registration verification provides.

Registration not found → verify search terms, then treat as unregistered. A failed search on business name may result from DBA name discrepancies. Retry with the UBI number or the registered legal entity name. If no record appears after two search methods, treat the contractor as unregistered.

Specialty trade with general registration only → insufficient. Confirm that the specialty trade credential appears in the applicable program database. General registration does not extend to restricted trades. Detailed credential requirements appear at Washington Contractor License Requirements.

For the broader landscape of contractor services and registration standards in Washington, the Washington Contractor Authority index provides a structured reference across all contractor categories and regulatory topics.

References

📜 2 regulatory citations referenced  ·  🔍 Monitored by ANA Regulatory Watch  ·  View update log

Explore This Site

Services & Options Key Dimensions and Scopes of Washington Contractor Services Regulations & Safety Washington Contractor Services in Local Context Tools & Calculators Contractor Bid Comparison Calculator FAQ Washington Contractor Services: Frequently Asked Questions