Washington contractor license lookup.
Find the business in Washington Labor & Industries’ Verify tool, then check the registration or trade credential that applies to the work.
Start with the business name.
On L&I’s Verify site, search the full or partial business or owner name. Compare the matching identity with the business on your proposal before reading its credentials.
Enter your search on L&I’s website. The official results open there in a new tab.
Reviewed September 8, 2026. This page does not retrieve license records or match contractors to permit histories. Check the current L&I record and save the date of your actual search.
Washington contractor verification: an annotated record walkthrough
Match the business first, then record the registration, relevant trade credentials and supporting evidence without turning an incomplete check into a hiring approval.
Fictional identity example; no real contractor status is asserted.
Start from the proposal, not a similar-looking name
Ask for the legal business name and relevant identifier. L&I Verify supports name and identifier searches, including the contractor number and UBI. Compare the result with the proposal and any trade names. A partial name match should remain an unresolved candidate.
Use the official tool linked below. ObservedWork does not mirror the state database or certify a contractor. The walkthrough uses a fictional company so no live registration or insurance status is implied.
Read the fields separately
| Field or evidence | What to record | What it does not settle |
|---|---|---|
| Business identity | Exact name, identifier and relationship to the proposal | A matching address alone does not establish identity. |
| Credential type and standing | Type, displayed status and check date | General registration does not establish every trade credential. |
| Workers’ compensation | Coverage information and the source document | Do not infer that every worker or subcontractor is covered. |
| Bond-related actions and citations | Actual records, dates and relevant details | A summary count is not a finding about the proposed work. |
| Separate trade or individual credential | Named business/person and applicable credential | Do not transfer one person’s qualification to everyone on site. |
Example: a trade name and legal name differ
A fictional proposal says “Cedar Example Remodel,” while a search returns “Cedar Example Construction LLC.” The worksheet records the names as different and asks for the UBI and the trade-name relationship. It does not silently merge the two businesses.
Once identity is resolved, save the official record URL and check date. Where the scope includes electrical or plumbing work, identify the business and people performing that work and review the appropriate credentials.
Save findings and unresolved questions
The downloadable example shows the difference between a completed research task and a verified fact. Mark “not checked” or “needs clarification” where evidence is missing. The on-page worksheet can retain your notes and produce an export.
Repeat time-sensitive source checks when relying on them for a new decision. Resolve ambiguous registration or coverage information with L&I and the relevant parties. A source check does not establish future workmanship or financial performance.
Sources and reproducibility
Continue your task
Check the record. Keep the evidence.
Keep a Washington contractor research record as you review L&I. Record evidence, see what still needs attention, and download the follow-up list. No account needed.
Department of Labor and Industries
Use L&I’s Verify tool to review contractor registration and available trade credentials, bond, and insurance information.
Open lookupThis worksheet does not retrieve records or certify a contractor. Keep this worksheet to one business. Use the all-state directory for work outside Washington.
Washington: contractor registration is not a skills endorsement. Check separate trade credentials, insurance, worker coverage and public bond claims where relevant. Read L&I’s verification guidance ↗
Your next checks
10 checklist gaps or follow-ups from your notes.
- Record the exact business name.
- Record the credential or registration number.
- Record the date of the source check.
- Record the official record URL.
- Still to check: match the business.
- Still to check: check status and scope.
- Still to check: check the trade and local authority.
- Still to check: review bond and insurance.
- Still to check: read public disclosures.
- Still to check: save evidence and open questions.
Notes stay in this tab and are not submitted to ObservedWork. Download them before reloading or leaving. You can also download a blank worksheet.
Is it a contractor license or a registration?
Washington uses contractor registration for general and specialty construction contractors. L&I’s registration guidance distinguishes those classifications and identifies additional requirements for certain regulated trades. A broad contractor registration should not be treated as permission to perform every kind of installation.
Read the credential’s actual name and scope. The phrase “licensed contractor” in an advertisement does not tell you which registration, business identifier, or professional credential the business holds.
Source: L&I contractor registration guidance ↗
What can you search in L&I Verify?
L&I supports searches using a business or owner name, contractor license number, employer account ID, or UBI. Its guidance describes information about registration, workers’ compensation, bond-related lawsuits, safety citations, and trade credentials. Available fields should be read in their source context.
A UBI identifies a business; it does not replace the credential for the work. Match the legal business identity before interpreting the other fields. Similar names can belong to different companies.
Source: L&I Verify search methods and record information ↗
Check plumbing and other trade credentials separately
L&I’s plumbing guidance explains that general contractor registration does not substitute for a plumbing contractor license. It also describes the relationship between the plumbing business and the certified people doing the work. Check the appropriate credential for each role instead of assuming one company record answers every question.
If a proposal combines construction with regulated trade work, ask who will perform each part and under which credential. Preserve the business and individual records separately when both are relevant.
Source: L&I plumbing contractor requirements ↗
What if you cannot find the contractor?
Try a partial business name, confirm the spelling, or request the relevant identifier from the contractor. Check that you are searching for the business rather than assuming the individual named on a proposal holds the same record. Ask L&I for clarification when the source remains ambiguous.
A missing search result is not enough to label a business unlicensed. This ObservedWork guide has no contractor-record database of its own, so it cannot establish that a record is absent from the state’s system.
Registration status and permit activity are separate checks
Illustrative example: a business appears in a city permit record under a shortened name, while an L&I result uses a longer legal name. The similarity is a lead for identity research. It does not establish the match without corroborating details.
Likewise, registration standing does not show how recently a contractor worked in a particular city. A permit record may describe an applicant or another project participant. Keep identity, role, geography, and date evidence attached to any claim about observed activity.
A practical verification checklist
- Match the business name and identifier to the proposal.
- Read the registration or license type and current status.
- Check separate trade and individual credentials where relevant.
- Review the supporting fields in the full source record.
- Save the source URL and the actual date of your check.
- Resolve mismatches with the contractor and L&I before relying on the result.
Independent educational guide, reviewed September 8, 2026. L&I provides the official records. A source check does not guarantee workmanship, purchasing authority, or future performance.