Hiring the right plumber protects your home and your wallet. The good news is that vetting one in New York takes about ten minutes if you know what to check. Use this checklist before you book any job, from a quick drain cleaning to a full repipe.
Why licensing matters in New York
New York has no statewide plumbing license. In New York City, the Department of Buildings (DOB) issues the Licensed Master Plumber (LMP) credential - required for water-main, sewer, and most plumbing work - and journeymen register with DOB to work under an LMP. Outside the city, counties and cities (Nassau, Suffolk, Westchester, Buffalo, Rochester, Syracuse, Albany) license plumbers locally and run their own permit and inspection programs.
Unlike many states, New York licenses plumbers locally, not statewide. In the five boroughs the credential is the NYC DOB Licensed Master Plumber (LMP); elsewhere it's a county or city license. Confirm the plumber holds the license for the jurisdiction where your work will happen.
A licensed plumber has met training and exam requirements and carries accountability if something goes wrong. An unlicensed handyman may be cheaper today and far more expensive after a failed repair floods a finished floor.
The vetting checklist
Run through these seven items for every plumber you are considering.
- 1License. In NYC, ask for the NYC DOB Licensed Master Plumber (LMP) number; elsewhere, the county or city plumbing license for your jurisdiction.
- 2Insurance and bond. Confirm general liability insurance and bonding, and ask for a certificate if the job is large.
- 3Written estimate. Require an itemized, written estimate before work begins. See typical numbers in our drain cleaning cost guide.
- 4Reputation. Read recent reviews and ask for references on bigger jobs.
- 5Permits. For water heaters, repipes, sewer work, and gas lines, a permit and inspection are often required. A pro who skips permits is a warning sign.
- 6Warranty. Ask what is warrantied, for how long, and whether it covers both parts and labor.
- 7Payment terms. Reasonable deposits are normal on large jobs. Full payment in cash before any work is not.
How to verify a license yourself
You do not have to take a plumber's word for it. New York City and the counties publish public license lookups.
NYC DOB Licensed Master Plumber (LMP)
Use the NYC Department of Buildings licensee search (BIS / NYC Open Data) for the LMP number the plumber gives you, and confirm the name matches the business.
County or city license
Outside New York City, check the licensing authority for your area -- for example, Nassau County or Suffolk County Consumer Affairs, or your city's building department. Every business in our directory shows the public registry data we matched it to, and you can read how we do that on our verification page.
Red flags to walk away from
Any single red flag below is a reason to pause. Two or more, and you should keep looking.
- Refuses to provide a license number or proof of insurance
- Will only give a price in person and pressures you to decide on the spot
- Demands full payment in cash before starting
- Has no written estimate or contract
- Wants to skip permits on work that legally needs them
- Quotes a price far below every other bid, which often means an unlicensed crew
If you are dealing with a true emergency such as a burst pipe, the pressure is real, but the fundamentals still apply. Our plumbing emergency guide explains how to act fast without getting taken advantage of.
Questions to ask before they start
A short conversation prevents most disputes.
- Is this price flat-rate or hourly, and what could change it?
- Who pulls the permit, and is the inspection included?
- What warranty comes with the parts and the labor?
- Will you haul away the old water heater, fixture, or debris?
- Who is the actual licensed person on site, not just the company name?
After you hire
Keep the signed estimate, the permit, and the final invoice together. If a repair fails inside the warranty window, those documents are your leverage.
When you are ready, you can browse licensed New York plumbers by city, or learn the early signs you need a plumber so you call before a small issue becomes an emergency.
Frequently asked questions
Sources & references
- NYC DOB Licensed Master Plumber · NYC Department of Buildings
- County & city licensing boards (Nassau, Suffolk, Westchester) · New York county & city licensing boards
- New York Plumbing Code · NYS Department of State
Browse our directory of licensed New York plumbers, or submit a single request and let up to 8 qualified pros in your area respond. No phone-spam, no upsells.
Continue reading
Slow drains, low water pressure, water stains, and other early warning signs that you should call a plumber now, plus which signals point to an emergency.
2026 drain cleaning prices in New York for snaking, rooter service, and hydro jetting, plus what drives the final bill and how to avoid overpaying.
A calm, step-by-step plan for plumbing emergencies in New York: how to shut off the water, handle burst pipes and sewage backups, limit damage, and call the right pro.