Do plumbers need a license in Pennsylvania?

Updated · KeystoneProGuide editorial team

Does Pennsylvania license plumbers?

Not at the state level. The Department of Labor and Industry says the Commonwealth has no licensure or certification requirements for most construction contractors, and plumbing is not among the few trades it lists as exceptions. The same page says that some of the state's 2,562 municipalities set their own licensing rules, typically for plumbers, electricians and home improvement contractors, that the state keeps no record of them, and that the only way to find out is to ask the municipality where the work will be done.

So the answer depends on your address. A plumber who is fully licensed in one township may need nothing extra in the next one, and a different license again across the city line.

Who licenses plumbers, then?

Three kinds of local body do it in Pennsylvania.

The state's registration law left room for this. The Attorney General's office explains that, after July 1, 2009, municipalities may no longer license or register home improvement contractors, with a limited exception for licensing standards already in effect then for plumbers, electricians and other trades where a license depends on passing tests or holding training certificates.

What does a Philadelphia plumbing license involve?

The city has two levels. A journeyman license lets a plumber work under a licensed master plumber but does not allow the holder to operate a business. It needs four years as a registered apprentice in the city and a passing score on an exam given by the International Code Council.

A master plumber must first spend at least a year as a Philadelphia journeyman, pass the city's master plumber exam, and file proof of insurance: $500,000 per occurrence in general liability, $300,000 in automobile liability, and workers' compensation. The license is renewed every year. The city defines plumbing work as building, altering or repairing drainage, traps, waste vents, water piping and fixtures attached to them.

Does a plumber also have to register with the state?

In most cases, yes. Pennsylvania's Home Improvement Consumer Protection Act requires anyone who offers or performs home improvements to register with the Attorney General. The office's questions and answers deal with plumbers by name: asked whether master plumbers need to register, it says that if they do repairs, replacements, installations or alterations on private homes, they are contractors under the law and must register.

The law has limits. It covers work at single-family homes, buildings of no more than two units, and single condominium or co-op units. It applies where the total price of the work agreed is more than $500. A business doing less than $5,000 of home improvement work a year is exempt.

Philadelphia handles this differently on paper. Its guidance sends contractors who are not plumbers, electricians or a few other trades to the state registration, while plumbers hold the city license. Ask a Philadelphia plumber for both numbers, since the state law itself names master plumbers.

How do you check a plumber's credentials?

  • The state registration. Ask for the number, which takes the form PA followed by digits and must appear on estimates and contracts. Look it up in the Attorney General's Home Improvement Contractor Search, which shows active registrations only and has a "Plumbing" entry in its type-of-work list, or call 1-888-520-6680.
  • A Philadelphia license. Use the city's contractor lookup on the "Find a licensed contractor" page, which also lists licensing violations. Questions go to 311, or (215) 686-8686 from outside the city.
  • A township or borough license. Call the code office of the municipality where your home is. Lower Merion publishes an online list but warns that it is not comprehensive and that you should ask for a current certificate of insurance.

Registration shows that the contractor filed proof of insurance. The Attorney General's office says it is not an endorsement of the contractor's competency or skill.

When does plumbing work need a permit?

The state code sets the baseline. Pennsylvania's Uniform Construction Code adopts the International Plumbing Code of 2021 and the International Residential Code of 2021. Its permit rule says an owner who plans to install, alter, repair or replace a plumbing system the code regulates must get a permit first, that an ordinary repair does not need one, and that adding to or relocating water supply, sewer, drainage, waste or vent piping is not an ordinary repair. An emergency repair may go ahead first if the application follows within 3 business days.

Labor and Industry says more than 90% of municipalities enforce the code themselves, so your township or borough code office has the final word.

Philadelphia spells its own line out. It says no plumbing permit is needed for minor repairs with the same material, such as replacing faucets, valves and parts, for taking a toilet off and putting it back when no pipes move, or for stopping leaks and clearing stoppages. Most other plumbing work needs a Plumbing Permit, overseen by a licensed master plumber, with inspections at the end. The Philadelphia guide covers the city's rules and its water department in detail.

What does the state law give you in the contract?

For a home improvement over $500, a written contract signed by both sides that sets out the work, approximate dates, the total price and your right to cancel. The Attorney General reported in May 2026 that you can cancel within three business days by any means, a phone call included, as long as the contractor actually receives it.

Two more rules matter to plumbing. Work done under the emergency provisions of the state consumer protection law is not treated as a home improvement, but only when the emergency meets that law's criteria and the contractor obtains the required waiver. And a time-and-materials job needs a written estimate, which the bill may not exceed by more than 10% without a signed change order. How to choose a plumber turns these rules into a checklist, and plumbers serving the region are on the plumbers directory page.

Sources

  1. Contractor Licensing, Pennsylvania Department of Labor and Industry
  2. Frequently Asked Questions: Home Improvement Contractor Registration, Pennsylvania Office of Attorney General
  3. Home Improvement Contractor Search, Pennsylvania Office of Attorney General
  4. Home Improvement Contractor Registration, Pennsylvania Office of Attorney General
  5. Find a licensed contractor and contractor information, City of Philadelphia
  6. Get a Master Plumber's License, City of Philadelphia
  7. Get a Journeyman Plumber License, City of Philadelphia
  8. Get a Plumbing Permit, City of Philadelphia
  9. 34 Pa. Code § 403.21. Uniform Construction Code., Commonwealth of Pennsylvania (Pennsylvania Code)
  10. 34 Pa. Code § 403.62. Permit requirements and exemptions., Commonwealth of Pennsylvania (Pennsylvania Code)
  11. Uniform Construction Code, Pennsylvania Department of Labor and Industry
  12. Licensing Information (Plumbing Program), Allegheny County Health Department
  13. Licensed Contractor List, Lower Merion Township
  14. Chapter 265: Contractors, Township of Upper Darby (Delaware County), via eCode360
  15. PA Supreme Court Upholds Consumer Right-to-Cancel Home Improvement Contracts Within Three Days Regardless of Medium, Pennsylvania Office of Attorney General

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