Before hiring a plumber, it is smart to confirm that they are properly licensed. Plumbing work can affect water safety, drainage, gas lines, appliances, and building code compliance. A licensed plumber is more likely to have the required training and authorization to perform the work legally.
The good news is that many states and local agencies provide a plumber license lookup tool online.
Why You Should Verify a Plumber's License
Verifying a plumber's license can help you avoid unqualified workers, code issues, unsafe installations, and problems with insurance claims or property sales.
A license check can help confirm:
- The plumber is authorized to work
- The license is active
- The license has not expired
- The plumber is in good standing
- The license type matches the work
- Disciplinary actions may exist, if listed
Step 1: Ask for the License Number
Before you verify plumber license status, ask the plumber or plumbing contractor for their license number. A professional should be willing to provide it.
Also ask whether the license belongs to:
- The individual plumber
- The master plumber
- The plumbing company
- The contractor supervising the work
This matters because some states license individuals, while others also regulate businesses or contractors.
Step 2: Identify the Correct Licensing Agency
Plumbing licensing is usually handled by a state board, local government, contractor licensing department, or trade licensing agency. The correct agency depends on your location.
Search for your state or city's official plumber licensing lookup. Avoid relying only on third-party sites when official records are available.
Step 3: Use the Official License Lookup Tool
Enter the plumber's name, company name, or license number into the official lookup tool.
Look for:
- Active license status
- Expiration date
- License classification
- Business name
- Location
- Restrictions
- Disciplinary history, if available
If the license is expired, suspended, inactive, or does not match the provider, ask questions before moving forward.
Step 4: Confirm the License Type
Some areas have different license levels, such as apprentice, journeyman, master plumber, plumbing contractor, or specialty license.
A plumber may be qualified for some work but not all work. For example, major commercial projects, gas work, or permit-based plumbing may require a higher license level.
Step 5: Ask About Insurance
Licensing and insurance are different. A plumber can be licensed but still lack adequate insurance.
Ask for proof of:
- General liability insurance
- Workers' compensation insurance
- Bonding, if required
Step 6: Check Permit Requirements
Some plumbing jobs require permits. Ask whether your project requires one and who will handle it.
Permit-based jobs may include:
- Water heater replacement
- Sewer line replacement
- Major repiping
- New bathroom installation
- Commercial plumbing work
- Gas line work
- New construction plumbing
Red Flags to Watch For
Be cautious if a plumber:
- Refuses to provide a license number
- Uses someone else's license
- Says permits are never needed
- Demands full payment upfront
- Has no written estimate
- Cannot provide insurance information
- Has poor or inconsistent business details
- Pressures you to decide immediately
Final Thoughts
To check if a plumber is licensed, ask for the license number, use the official plumber license lookup tool, confirm the license status, and verify insurance.
A few minutes of checking can help protect your property, your budget, and your peace of mind.