Washington gives homeowners something most states do not: a single, free, public database showing whether the person about to work on your house is legally allowed to. It requires no account, costs nothing, and takes about as long as reading this paragraph twice.
Finding the register
The Department of Labor & Industries operates the contractor verification tool on its website. You can search by business name, by registration number, or by the owner’s name. The last of these is useful when a business name has changed but the person behind it has not.
Search by registration number where you have it, because business names are frequently similar and it is easy to look at the wrong record and conclude everything is fine.
The four fields that matter
Registration status. This should read as active. Expired, suspended and revoked all mean the same thing for your purposes: do not sign yet. A contractor whose registration lapsed last month may simply have forgotten to renew, but that is a conversation to have before work starts rather than after.
Surety bond. Check it is current and note the expiry date. The bond is your financial recourse if work goes wrong and the contractor will not put it right. A bond expiring three weeks into a two-month project is worth raising.
Liability insurance. Confirm it is in force. This is not the same thing as the bond. Insurance covers damage caused to your property during the work; the bond covers valid claims against the contractor. You want both.
Infraction history. L&I publishes infractions issued against registered contractors. One old, resolved item is context. A pattern of them is information you should act on.
The check almost everyone skips
Compare the business name on your written bid against the name on the register. They should match exactly.
A mismatch is one of the most reliable warning signs there is. At best it means the paperwork is being handled carelessly. At worst it means someone is trading under a clean name while a registration carries history. Either way it is a question worth asking before you sign, and it costs nothing to look.
Registration numbers on advertising
Washington requires registered contractors to include their registration number in advertising. A written bid, a van, a website or a flyer with no registration number anywhere on it should prompt a question rather than a signature.
Save a copy
Screenshot or save the register entry on the day you sign, with the date visible. If a dispute arises later and the contractor’s status has changed in the meantime, your dated copy is evidence of what was represented to you at the point you committed. This takes ten seconds and is occasionally worth a great deal.
If they are not on the register at all
Then they are not a registered contractor in Washington, and you should not sign. Registration is a legal requirement for contracting work in this state. Its absence is not an administrative technicality, and a contractor who tells you otherwise is telling you something useful about how they operate.