Licensed Plumber in New York: How to Verify Before You Hire

Hiring a plumber in New York means navigating one of the most fragmented licensing systems in the country. There is no statewide plumber's license in New York. Plumbing is regulated locally, which means who licenses your plumber — and how to verify it — depends entirely on where you live.

For most New Yorkers, that means checking with the NYC Department of Buildings or your county's local licensing authority. This guide walks you through exactly how to do that, what the license classifications mean, and what it costs you if something goes wrong with an unlicensed plumber.

Does New York require plumbers to be licensed?

Yes, but licensing is handled locally rather than by New York State. New York City requires plumbers to hold a Master Plumber or Journeyman Plumber license issued by the NYC Department of Buildings. Outside NYC, licensing requirements vary by county and municipality — some counties require it, some do not.

Unlike trades such as electrical work, which New York City and most municipalities regulate strictly, general plumbing licensing in smaller New York counties can be inconsistent. If you are in Nassau, Suffolk, or Westchester, your county likely has its own plumbing licensing requirement separate from NYC.

What types of plumber licenses exist in New York City?

New York City issues two primary plumber license types through the NYC Department of Buildings: the Licensed Master Plumber (LMP) and the Journeyman Plumber. The Master Plumber is the one who can pull permits, be the licensee of record on a job, and operate a plumbing business. The Journeyman can perform work under a Master's supervision.

When you hire a plumbing company in NYC, the critical question is whether there is a Licensed Master Plumber associated with that company. A Master Plumber license requires significant field experience (typically at least seven years), passing a rigorous exam, and maintaining insurance. The business itself — not just the individual — must be licensed to do plumbing work in the five boroughs.

A Journeyman Plumber can perform the physical plumbing work, but cannot be the responsible party on a project. If a company sends a crew to your home and no Master Plumber is associated with the job, that is a compliance problem regardless of how skilled the workers are.

How do you look up a plumber's license in New York City?

Go to the NYC Department of Buildings website at nyc.gov/buildings and use the License/Registration search tool. You can search by name or license number. The results show the license type, status (active or inactive), and the licensee's business information. An active license means the plumber is currently in good standing with the DOB.

The DOB's Building Information System (BIS) is the authoritative source for NYC plumber licenses. Here is how to use it:

• Go to nyc.gov/buildings and navigate to the license lookup tool
• Select "Plumber" as the license type
• Search by the plumber's name or their license number
• Confirm the license is Active and not expired or suspended
• Verify the name on the license matches the company or individual you are hiring

If you have the license number directly from the plumber, use that for the most reliable search. Name searches can miss results if the business operates under a DBA that differs from the legal name on file.

What is required of licensed plumbers in New York City beyond the license itself?

Licensed Master Plumbers in NYC must carry general liability insurance and workers' compensation coverage for their employees. The DOB requires active insurance on file to maintain licensure. This means an active license number is itself an indicator of minimum insurance compliance — but you should still request a certificate of insurance directly before signing any contract.

NYC does not require plumbers to post a surety bond the way some other states do for home improvement contractors. However, the DOB does require that the licensed Master Plumber be the person who pulls permits for any plumbing work. If your plumber is not willing to pull a permit, that is a serious red flag.

Permitted plumbing work gets inspected by a DOB inspector at key stages. Unpermitted plumbing can result in violations, mandatory removal of work, and difficulties when selling your home. In NYC, the Department of Buildings reported issuing over 30,000 plumbing permits annually — plumbing permits are routine, not exceptional.

How do you verify a plumber outside New York City?

Outside the five boroughs, plumber licensing falls to county and local authorities. Nassau County, Suffolk County, and Westchester County each have their own licensing requirements. Contact your county's consumer protection office or building department to find the specific database for your area. For upstate cities like Buffalo or Rochester, check with the city's building department directly.

In areas without a county-level plumber licensing requirement, you should still verify:

• That the plumber carries current general liability insurance (ask for a certificate)
• That workers' compensation coverage is in place (verify through the NY Workers' Compensation Board at wcb.ny.gov)
• That the contractor has a current business registration with the NY Department of State (searchable at apps.dos.ny.gov)
• That any required building permits are pulled through your local municipality

The absence of a local license requirement does not mean anything goes. Insurance and permit compliance remain mandatory regardless of whether there is a plumbing license in your county.

What does it cost to hire an unlicensed plumber in New York?

The cost of hiring an unlicensed plumber in New York can be severe. If unpermitted work causes water damage, flooding, or structural harm, your homeowner's insurance may deny the claim because the work was not licensed or permitted. In NYC, performing plumbing work without a licensed Master Plumber is illegal and can result in DOB violations and stop-work orders.

Beyond insurance denial, homeowners who discover unpermitted plumbing during a home sale often face expensive remediation. Buyers' inspectors and lenders regularly flag unpermitted plumbing, and you may have to bring the work up to code at your own expense before closing. According to the FTC, home improvement fraud — which frequently involves unlicensed contractors — costs consumers over $3 billion annually nationwide.

There is also no regulatory recourse. If a licensed plumber does substandard work in NYC, you can file a complaint with the DOB, which can investigate and take action against the licensee. If the plumber is unlicensed, the DOB has no jurisdiction to help you. Your only option is civil court.

What questions should you ask a New York plumber before hiring?

Before signing any plumbing contract in New York, ask for the Master Plumber license number, verify it on the NYC DOB website, and request a certificate of insurance. Ask specifically who will pull the permit for your job and confirm that person's license is active. Any legitimate plumbing company will answer these questions immediately and without hesitation.

Key questions to ask every plumber:

• What is your Master Plumber license number, and which borough or county issued it?
• Will you pull the permit for this job? (The answer must be yes for any significant work.)
• Can you provide a certificate of insurance showing current liability and workers' comp coverage?
• Is the work covered under a written contract? (Required in New York for jobs over $500.)

You can skip the complexity of checking state and local databases by using CheckLicensed.comto verify your plumber's credentials in seconds. Enter the company name or license number and get an instant report on license status, insurance, and any complaints on record — for $0.99 per check. It is the fastest way to confirm you are hiring a legitimate licensed plumber in New York.