How to Verify a Licensed Master Plumber in NYC
In New York City, plumbing work is regulated, and gas piping must be done by a licensed master plumber. Before you hire, check the license. It takes a few minutes.
Updated 2026-10-21
Check the license
- Ask the plumber for their license number and the name on the license.
- Look it up with the NYC Department of Buildings. The DOB has a page for checking construction professionals.
- Make sure the name and business match who is coming to your home.
Ask about insurance
- Ask for a certificate of insurance. Co-ops and condos often require one naming the building.
- Confirm it is current.
Other signs of a reputable plumber
- A written estimate.
- A written warranty on workmanship.
- Reviews from real customers on independent sites.
- A clear business address and contact details.
Frequently asked questions
Why does licensing matter?
Licensed work follows code and permit rules, and gas work in NYC legally requires a licensed master plumber.
Where do I check?
Use the NYC Department of Buildings, which lets you look up licensed construction professionals.
Related
Need a plumber in Manhattan?
Call for emergency service or a written estimate. You get the price before work begins.