Request legal company name, UBI, registration or plumbing-contractor number, and individual plumber identity and certification.
DOWNTOWN SEATTLE / GUIDE
Verify a Washington Plumbing Provider
L&I records may show registration, bond, insurance, workers' compensation, ownership, citations, bond lawsuits, and certification information.
PRACTICAL GUIDE
Match names and identifiers
Match the answering business and assigned tradesperson to current Washington records and the written proposal.
Verification does not establish downtown coverage, building access, availability, price, permit handling, quality, or outcome.
Check the proposal against current records
Request the legal business name, UBI, contractor or plumbing-contractor registration, and the assigned plumber's name and certification when relevant. Compare those identifiers with current Washington L&I records, then confirm insurance, property type, service area, access, availability, permits, pricing, and terms separately.
Record the date and identifiers used in the search.