Short Answer: Find the official state licensing board or agency, search its public record by name or number, and confirm the status, legal name, classification, bond and insurance. Then check any city or county licence your project needs.
Quick Facts
| Authority | The state board or agency record |
|---|---|
| Licensing models | Trade exam licensing or registration with bond and insurance |
| Key fields | Status, legal name, classification, bond, insurance, discipline |
| Local rules | Cities and counties may add licences and permits |
| Washington | Registration with L&I under RCW 18.27 |
Key Takeaways
- Every state sets its own rules; the official board or agency record is the authority.
- Some states license by trade and exam; others, like Washington, register contractors with a bond and insurance.
- Check status, legal name, classifications, bond, insurance and discipline.
- Cities and counties may add their own licences and permits.
There is no single national contractor license database. Licensing is set state by state, and sometimes city by city. The good news is that the steps for checking are similar everywhere once you know where to look.
Step 1: Find the Right Agency
Each state assigns contractor licensing to a board or agency. Common names include:
- a contractors state license board,
- a department of labor or labor and industries,
- a department of professional regulation or licensing,
- a building codes division,
- a secretary of state for business registration.
Our Check a Contractor License in Any US State links to the official tool for each state. In Washington, it is L&I Verify.
Step 2: Understand What That State Requires
States take different approaches:
| Approach | What it means |
|---|---|
| Licensing with exams | Contractors pass trade or business exams and meet experience rules. |
| Registration | Contractors register, post a bond and carry insurance, without a general exam (Washington’s model). |
| Trade-only licensing | Only certain trades (often electrical and plumbing) are licensed at state level. |
| Local licensing | Cities or counties license contractors. |
Many states combine these, for example registering general contractors while licensing electricians and plumbers separately.
Step 3: Search the Record
Search by licence number when you have it; it is the most precise. Otherwise search the legal business name. Try variations if nothing comes up.
Step 4: Read the Key Fields
Whatever the state, look for:
- Status: active, expired, suspended, revoked, inactive.
- Legal name and any trade names.
- Classification: what work the licence covers.
- Expiry date.
- Bond details, where required.
- Insurance details, where shown.
- Discipline, complaints or lawsuits.
- Qualifying individual or responsible managing person, where the state uses one.
Step 5: Match the Record to Your Contract
The name and number on your contract should match the record. Check the classification covers your project: a roofing licence does not cover electrical work.
Step 6: Check Local Requirements
Cities and counties may require their own business licences and always control building permits. Ask who will pull permits for your project and confirm with your building department.
Step 7: Re-Check Before Large Payments
Statuses change. Bonds are cancelled and insurance lapses. A quick re-check before each big payment is cheap insurance.
Tip: Screenshot the record with the date when you check. If something changes later, you have proof of what the record showed.
Washington Specifically
In Washington, construction contractors register with L&I under RCW chapter 18.27. Electricians and plumbers are licensed and certified separately. The full process is in How to Check a Contractor License in Washington, and you can search any business in our Washington Contractor License Lookup.
When a State Has No Licence for Your Trade
Some trades are unlicensed at state level in some places. In that case:
- confirm the business is registered with the secretary of state,
- ask for a certificate of liability insurance and call the insurer to confirm it,
- check local licensing and permit history,
- ask for references and read reviews,
- use a detailed written contract.
Working Across State Lines
Contractors near a border may hold licences in more than one state. A licence in a neighbouring state does not authorise work in yours. Check the record in the state where your property is.
Red Flags in Any State
- The contractor will not give a licence number.
- The number belongs to a different business.
- The licence is inactive or expired.
- The classification does not match the work.
- There are unresolved complaints or disciplinary actions.
The FTC’s consumer guidance on hiring a contractor makes the same core point: check licensing with your state and local authorities before you hire. Our list of Contractor Scam Red Flags covers warning signs beyond licensing.
A Worked Example: Checking a Contractor Across a State Line
Suppose you live just inside one state and the contractor you like is based across the border. They show you a licence card from their home state.
- You open the official lookup for your state, where the work will happen, not theirs.
- You search their business name and find no record. You try variations and the owner’s name. Still nothing.
- You ask the contractor directly whether they are licensed or registered in your state. They say they are applying.
- You decide to wait until the record appears with an active status before signing anything.
The licence in the neighbouring state may be perfectly valid, but it does not authorise work on your property. Bonds, insurance requirements and consumer protections attach to the registration in the state where the work is performed.
What to Record When You Check
Whichever state you are in, write down or screenshot:
- the date you checked,
- the licence or registration number,
- the exact legal name,
- status and expiry date,
- classifications,
- bond and insurance details, if shown,
- any complaints, discipline or lawsuits.
That record becomes part of your project file and helps if anything changes later.
Common Mistakes
- Trusting a licence card or truck decal instead of the live record.
- Searching the wrong state when the business is based elsewhere.
- Assuming a business licence is a contractor licence. A general business licence usually shows only that a business exists.
- Ignoring classifications. A licence for one trade does not cover another.
- Checking once and never again on a long project.
Local Licences and Permits
Even where a state does not license a trade, cities and counties often control the work through building permits and inspections. The permit is where a building official checks that work meets code. Ask your contractor which permits your project needs and who will apply for them, then confirm with your local building department. Some departments let you search permit history by address or contractor name, which can also show you how often a contractor pulls permits for the kind of work they are quoting.
Bottom Line
Find the official lookup for the state where the work happens, read the record carefully and match it to your contract. The process takes a few minutes and works the same way almost everywhere.
Steps to Take
- Identify the state agency that licenses or registers contractors for your trade.
- Search the official record by business name or number.
- Read the status, classification and expiry date.
- Match the legal name and number to your contract.
- Check local licences and re-check before large payments.
Frequently Asked Questions
Is There a National Contractor License Lookup?
No. Contractor licensing is regulated by states and sometimes by cities or counties. You need the official lookup for the state where the work will be done.
Does a License in One State Cover Work in Another?
Generally no. Contractors must meet the requirements of the state where the work is performed, although some states have reciprocity for exams.
What If a State Does Not License My Type of Contractor?
Some states do not license certain trades at the state level. Check local city or county requirements, business registration and insurance instead.
Sources
Data references use Washington L&I open data published under the PDDL. This guide is general information, not legal advice.