Connecticut Plumbing License Guide: The P-1 and P-2 Rules for 2026

Connecticut issues a plumbing license to a person, never to a company. The Department of Consumer Protection's own application page says so flatly: "Only individuals can apply, company applications are not accepted."

At a glance

• Who issues it: Connecticut Department of Consumer Protection (DCP), Occupational and Professional Licensing
• Who can apply: Only individuals; company applications are not accepted
• P-1 hours: 576 classroom hours and 12,000 hours of on the job training
• Exam: PSI, $59 per portion, 70 percent passing score
• Renewal: $150 contractor or $120 journeyperson, every October 31

That single rule, individual licenses only, is the fact that trips up contractors moving into Connecticut and tradespeople trying to figure out what to study for. This guide walks the ladder from apprentice to P-1 Unlimited Plumbing Contractor, what the hour requirements actually mean, what changed for plumbing businesses on October 1, 2025, and the documentation rule that fails otherwise qualified applications. For the wider licensing picture, see our Connecticut contractor license overview and the national contractor license pillar.

Who regulates plumbing work in Connecticut

Plumbing is regulated by DCP's Occupational and Professional Licensing division, at 450 Columbus Boulevard in Hartford. The Plumbing and Piping Work Examining Board advises DCP on examinations and licensure. The governing law is Chapter 393 of the Connecticut General Statutes, which covers electricians, plumbers, and heating, piping and cooling contractors together.

Section 20-330(3) defines plumbing and piping work as installing, repairing, replacing, altering, maintaining, inspecting or testing gas, water and associated fixtures, tubing and piping, among related items. The definition carves out a few things people assume are included: subsurface sewage disposal systems, fire prevention apparatus inside a structure (with a narrow standpipe exception), medical gas and vacuum systems, and millwright work all sit outside the plumbing license's scope.

Applicants must be at least 18 with an eighth grade education or its equivalent, per Section 20-333(a). Under Section 20-338, a Connecticut plumbing license is valid in every town in the state. No municipality can require its own plumbing exam or local license on top of it.

Two points are easy to get backward:

• There is no "master plumber" license in Connecticut. The top individual credential is the P-1 Unlimited Plumbing Contractor. If you are searching for a Connecticut master plumber license, the P-1 is what you want.
• The "Contractor" in P-1 Unlimited Plumbing Contractor is a person, not a company. Section 20-334(b) says "No such license shall be transferred to or used by any person other than the person to whom the license was issued." Section 20-330(27) defines "person," for other purposes in the chapter, as an individual, partnership, LLC or corporation, but the license itself only ever belongs to an individual.

The Connecticut plumbing license ladder

Apprentice. An apprentice permit, issued under Section 20-334a(a)(3), authorizes plumbing work for training purposes only, under the supervision of a licensed contractor or journeyperson. You register through the Connecticut Department of Labor Office of Apprenticeship Training, which requires at least 144 hours of related classroom instruction a year and one full time journeyperson supervising each apprentice on site. Two clocks matter when you finish: Section 20-333(b) gives you thirty days to apply for the licensure exam after completing the program, and Section 20-334a(a)(4) says the permit expires if you miss the first exam offered after you finish. There is a second safety valve worth knowing: if you fail three exams in a single year, the permit survives only if you apply for and take the first exam offered after that one year period ends; otherwise it is revoked.

P-2 Unlimited Journeyperson Plumber. Covers all plumbing and piping work under Section 20-330, but only while employed by a licensed contractor. DCP's qualifying path is a registered apprenticeship or equivalent experience and training. The statute, Section 20-334a(a)(2)(A), describes a bona fide apprenticeship including "not less than four years' experience in the trade," plus the state exam.

P-1 Unlimited Plumbing Contractor. Covers all plumbing and piping work defined in Section 20-330, full stop. The qualifying path is two years as an unlimited licensed journeyperson, or equivalent experience and training; Section 20-334a(a)(1)(A) sets that two year figure and requires out of state journeyperson service to be comparable to Connecticut service.

That phrase, "or equivalent experience and training," is the route for out of state tradespeople and anyone who learned the trade outside a registered Connecticut apprenticeship. It carries its own, much stricter documentation rules, covered below.

Every plumbing license type Connecticut issues

P-1 and P-2 are not the only credentials. DCP's scope of work list includes a set of limited licenses, each paired as a contractor and journeyperson version (what searchers call a "restricted plumbing license"; DCP's own word is "limited"). Every journeyperson version works only while employed by a licensed contractor.

Notes on the scope column, condensed from DCP's own wording:

• P-6/P-7 covers water, sewer and storm lines from the point of utility responsibility to a point immediately inside the structure.
• PP-1/PP-2 covers piping or tubing that conveys a liquid or gas used directly in producing a chemical or a product for human consumption.
• SP-1/SP-2 covers pool, hot tub and spa maintenance and repair starting at an outlet, receptacle, connection, backflow preventer or fuel supply pipe already installed by a properly licensed person; it excludes any component a licensed plumber or electrician must install. Both SP licenses also require APSP CMS or CST pool certification, or equivalent courses, on top of the experience requirement.
• Choosing the wrong limited license for the work is a scope violation, not a technicality DCP overlooks.

The hours: what 12,000 actually means

This is the number that trips people up, and DCP publishes the exact math in its equivalent experience and training charts.

For a P-1, the requirement is 576 classroom hours and 12,000 hours of on the job training. The 12,000 is not 12,000 hours of apprenticeship; DCP's chart breaks it into two sequential pieces.

Read the P-1 row again: 8,000 hours of apprenticeship level training, plus a further two years, counted as 4,000 hours, working as a licensed journeyperson. Someone with 12,000 raw field hours who never held a journeyperson license does not satisfy this; the journeyperson time is a separate, sequential requirement, the same two years Section 20-334a(a)(1)(A) demands before you can sit for the contractor exam.

Classroom hours are not negotiable. DCP's instruction is blunt: "Classroom hours are required. On the job training and work experience will not be considered in lieu of the classroom requirement."

The coursework also has to match the hours and curriculum content of DCP's required course list for the license type. Continuing education certificates and manufacturer certificates do not count. Degrees or classes that are not equivalent do not count.

The documentation trap that fails applications

If you are applying under equivalent experience and training, DCP spells out exactly what it will and will not accept, and this is where otherwise qualified plumbers lose their application:

• Transcripts, degrees and diplomas must show the same number of hours and an equivalent curriculum to DCP's required course list.
• Experience must be proven by notarized letters from current or previous employers, stating dates of employment and a specific, detailed description of work covering all aspects of the scope of work.
• "Letters MUST be notarized. Letters that are not notarized will not be accepted."
• "Payroll records, W-2's, or tax returns will not be accepted."
• An out of state apprenticeship certificate must come with documentation of the classroom and on the job hours the program required.

That "no W-2s" line surprises almost everyone; the documents that prove employment in most states are explicitly rejected here. A former employer has to write and notarize a letter, and if that employer is out of business or unwilling, there is a real problem to solve before filing.

Two more rules worth internalizing: DCP states plainly that it "does not pre-approve or review applications before submission," and that application fees are nonrefundable. Connecticut reviews the package once and denies it on documentation if it is wrong. Get it right the first time.

Out of state plumbers: no reciprocity, but an equivalency path

DCP's own plumbing page states that Connecticut "does not have reciprocal agreements with any other jurisdiction." Section 20-333a lets the commissioner waive the exam for licensees from states with substantially similar requirements that return the favor, but no such agreement currently covers plumbing, and every individual applicant sits for the Connecticut exam.

What does exist is the equivalent out of state license path. DCP defines an equivalent license as one that required "the same number of classroom hours, equivalent classroom curriculum, and on the job training (OJT) hours" as the Connecticut license sought.

One caution: on the P-1 row, DCP's own out of state equivalency page shows 576 classroom hours in its chart but says 720 in the worked example right above it, with no explanation for the gap. Ask DCP in writing which figure it will apply before relying on this path.

Submit a copy of the license, a license verification, the laws and regulations behind it, and its scope of work. DCP reviews one out of state license only, and if equivalency cannot be shown, the application will not be approved on that basis. Some states license plumbers on fewer classroom hours than Connecticut requires, so many experienced out of state plumbers end up on the equivalent experience path instead.

Step by step: apprentice to P-1

1. Register as an apprentice with the Connecticut Department of Labor. You need a sponsoring employer and must be at least 16; related instruction runs at least 144 hours a year alongside your on the job hours.
2. Finish the program and apply to DCP within thirty days of completion (§ 20-333(b)); miss the first exam offered and the permit lapses.
3. Pay the $90 journeyperson application fee (nonrefundable). Equivalent experience and out of state applicants attach their documentation at this step.
4. Schedule the P-2 trade exam with PSI once DCP approves the application. Eligibility lasts one year. Pay PSI $59, pass at 70 percent, and send DCP the licensing fee shown on the passing score report.
5. Work two years as a licensed P-2, employed by a licensed contractor, renewing every October 31 and keeping up continuing education from the second renewal on.
6. Apply for the P-1 with the $150 contractor application fee. Two years as a P-2 is the direct path; equivalent experience and training, or an equivalent out of state license, are the alternatives.
7. Pass both PSI portions, trade and Business and Law, $59 each at 70 percent. A passed portion stays valid two years while the other is cleared.
8. Pay the $150 initial contractor license fee, then renew every October 31 at $150, with five hours of continuing education every two years.

For how the calendar plays out across states generally, see our national breakdown of how long a contractor license takes.

The exam: PSI, and how the two portions work

DCP contracts plumbing exams to PSI Services LLC. PSI's current Connecticut Plumbing Trades Candidate Information Bulletin, updated February 4, 2026, lays out the structure:

• Journeyperson candidates pass only a trade portion.
• Contractor candidates pass both a trade portion and a Business and Law portion.
• Passing score is 70 percent on every portion.
• The fee is $59 per portion, whether it is a first attempt or a retake; registration fees are not refundable or transferable.
• Eligibility runs one year from the date DCP approves the application, with unlimited attempts inside that window.
• For contractors, a passed portion stays valid two years. Pass Business and Law, and there are two years to pass the trade portion before the business score expires. Add a second contractor license later without a business pass inside the last two years, and the business portion has to be retaken along with the new trade portion.

Open book references allowed in the exam center, per the PSI bulletin:

• Business and Law: Contractors Guide to Business, Law and Project Management, Connecticut, 6th edition (NASCLA).
• P-1 and P-2 trade exams: International Plumbing Code (2015, 2018 or 2021 edition), NFPA 54, NFPA 58, NFPA 56, 29 CFR 1926 (OSHA), and Water Processing: Residential, Commercial, Light Industrial, 3rd edition.
• References may be highlighted, tabbed and indexed before the exam, but nothing may be written in them during the session, and only permanent tabs are allowed; sticky notes are confiscated.

The P-1 exam leans hardest on drain, waste and vent work (14 of 80 items) and isometric analysis and gas systems (9 items each). Connecticut PSI test centers are in West Hartford (1245 Farmington Avenue, Suite 203) and Milford (500 BIC Drive, Suite 105), with additional sites in Massachusetts at Auburn, Charlestown in Boston, Fall River and West Springfield that Connecticut candidates may also use.

Fees and renewal dates

Verified against DCP's plumbing licensing page, the PSI bulletin, and Sections 20-333 and 20-335.

Connecticut's plumbing licenses expire October 31 each year, while heating, cooling and sheet metal work licenses expire August 31; a contractor holding both is tracking two different annual deadlines.

Section 20-335 allows a short grace period: the board may still renew if the application arrives no later than one month after expiration. But Section 20-341 makes willfully working after expiration a class B misdemeanor, so treat October 31 as a hard date. A license lapsed more than two years can only be reinstated by meeting the Section 20-333 requirements again. DCP also publishes reinstatement paths and a Retiree Status license; confirm the current form with DCP before letting anything lapse.

Continuing education

Connecticut plumbers renew annually but complete continuing education on a two year cycle. DCP's Plumber Continuing Education page sets the hours, and Section 20-334d(c) caps what the regulations may require at seven hours every two years absent major code changes.

Notes:

• No CE is currently available for P-6, P-7, PP-1 or PP-2 holders, so there is no obligation for those license types; Section 20-334d(d) exempts P-6 and P-7 holders outright by statute.
• The completion window closes three months before renewal. CE is not required before a first renewal.
• Courses must be approved by the Plumbing and Piping Work Examining Board, and certificates need to be kept for at least four years in case of a DCP audit.
• Failing to complete required CE can bring civil fines, and suspension or revocation of the license.

The business question: who holds the license for the company

Now the part that matters if you are not just chasing a card for yourself.

Connecticut issues no plumbing license to a company. DCP's own plumbing licensing page says it in plain language: only individuals can apply, company applications are not accepted. There is no LLC license, no corporate plumbing license, no business level plumbing permit.

Section 20-337, Ownership of businesses, makes the company's position precise: "Nothing in this chapter shall require that the ownership or control of a business engaged in providing the work or services licensed under the provisions of this chapter be vested in a person licensed under this chapter, but all the work and services set forth in section 20-330 shall be performed by persons licensed for such work or occupation under this chapter." The owner does not have to be a plumber, but every hour of plumbing work has to be done by a licensed one. Section 20-334(b) adds that a license cannot be used by anyone but its holder and requires the license number on every commercial vehicle, advertisement, bid, contract and invoice, with fines up to $500 per violation after the first. Section 20-341(a) makes it a class B misdemeanor to willfully employ or supply for employment a person who does not hold the license the work requires; DCP's board can also assess a civil penalty up to $3,000 per violation after notice and a hearing, and unregistered apprenticeship activity can draw fines up to $5,000 per violation.

What a Connecticut plumbing business needs, then, is a licensed individual attached to it. A P-2 may work "only while in the employ of a contractor licensed for such work." A P-1 is the license that lets the work be sold and performed. If the P-1 leaves, the work stops being legal immediately, not eventually.

Option three below is what a qualifying agent is for. Connecticut's statute just says "in the employ of," but it describes the same role other states call a qualifier, qualifying party or responsible managing employee: a qualifying agent legally qualifies the company, either as its owner or as a full time W-2 employee who actually supervises the work. The Licensing Company connects plumbing businesses with licensed P-1 contractors through our contractor qualifier services, and our guide to whether a qualifier must be an owner or an employee walks through how that compares across states.

Every qualifier we place is a full time W-2 employee who genuinely supervises the work, because that is the only structure that survives a DCP audit. To staff a Connecticut P-1 on your payroll, start at hire a qualifying agent. Licensed P-1 contractors interested in serving as a company's qualifier can read about becoming a qualifying agent.

What changed on October 1, 2025

Until then, larger commercial firms carried a second layer of registration. Chapter 393b had defined a "mechanical contractor" as a business regularly offering the public the services of employees licensed in plumbing or heating, piping and cooling work, with carve outs for smaller residential firms, and required a certificate of registration before such a firm could offer the work.

Public Act 25-111 repealed that registration requirement effective October 1, 2025. DCP's mechanical contractor registration page now carries a single line: "Per Public Act 25-111, the law requiring registration for Mechanical Contractors has been repealed effective October 1, 2025." If an older guide tells you to register a plumbing company as a mechanical contractor, that requirement no longer exists.

One more correction worth making explicit: Home Improvement Contractor registration ($220, expiring annually on March 31, with at least $20,000 of general liability insurance) applies to businesses contracting with consumers for home improvement work. But DCP's own eligibility rules exclude "work that is covered under the scope of a trade license." Plumbing performed under a plumbing license does not, by itself, trigger HIC registration; a company that also sells bathroom remodels, additions or other work outside plumbing's scope does need it.

What this means for a contractor expanding into Connecticut

If you own a plumbing company and are not personally a P-1, there are exactly three options:

1. Earn the P-1 yourself. 576 verified classroom hours, 12,000 hours structured as 8,000 plus two licensed journeyperson years, notarized documentation, and both PSI portions. Realistically a multi year project for anyone starting outside the state's apprenticeship system.
2. Do not perform plumbing work. Subcontract it to a licensed plumbing contractor and accept the margin loss and the scheduling dependency.
3. Employ a licensed P-1 who serves as your qualifier. The license stays with the person, the person works for the company, and the company can sell and perform plumbing work legally under Section 20-337.

Frequently asked questions

How much does a Connecticut plumbing license cost? The state side numbers are public and fixed: $150 contractor or $90 journeyperson application, $59 per PSI exam portion, $150 or $120 for the initial license after passing, and $150 or $120 at each annual renewal. What varies is everything around them: classroom hours, notarized documentation, CE courses and years of journeyperson time. For a company trying to figure out the cost of getting licensed work done rather than one person's exam fees, call 615-219-2110 to talk through the specifics.

How long does it take to become a plumber in CT? For someone starting fresh, the registered apprenticeship runs 8,000 hours of on the job training, roughly four years of full time work, and the P-1 needs two further years as a licensed P-2. For an experienced plumber applying under equivalent experience and training, the binding constraint is usually documentation, not time: notarized employer letters and proof of 576 hours of equivalent classroom instruction, plus PSI scheduling and DCP review.

What is a P-2 plumbing license? The P-2 Unlimited Journeyperson Plumber license covers the full Section 20-330 scope of plumbing and piping work, but only while the holder is employed by a licensed contractor. It is earned by completing a registered apprenticeship, or equivalent experience and training, and passing the 70 question PSI trade exam; two years as a licensed P-2 is the direct route to the P-1.

Is there a restricted or limited plumbing license in Connecticut? Yes, though DCP's own word is "limited," not "restricted": P-6 and P-7 (sewer, storm and water), P-8 and P-9 (gasoline tank piping and pumps), J-1 and J-2 (well pumps and water conditioning), J-3 and J-4 (lawn sprinklers), PP-1 and PP-2 (process piping), and SP-1 and SP-2 (spa and pool). Each has a hard scope boundary and its own hour chart.

Can my LLC hold a Connecticut plumbing license? No. DCP states that only individuals may apply and company applications are not accepted. An LLC performs plumbing work through licensed individuals it employs, under Section 20-337. The mechanical contractor registration larger firms once filed under Chapter 393b was repealed effective October 1, 2025.

Is there a master plumber license in Connecticut? No. Connecticut's structure runs apprentice, then P-2 unlimited journeyperson, then P-1 unlimited plumbing contractor. "Master plumber" is not a Connecticut license type; P-1 is the closest equivalent.

Do I need a license to replace a water heater in Connecticut? Water heater work falls within plumbing and piping work as defined in Section 20-330, which means it requires an appropriately licensed person, and Section 20-338c bars starting work before any required permit is pulled. Check the scope of the specific license type first; the limited licenses have hard boundaries, and working outside that scope is a violation.

Does DCP require liability insurance to hold a P-1 or P-2? DCP's plumbing license application pages do not list an insurance requirement among the P-1 or P-2 qualifications. The $20,000 general liability minimum that does appear in Connecticut licensing applies to Home Improvement Contractor registration, a separate credential for businesses selling consumer home improvement work outside a trade license's scope, not to the plumbing trade license itself.

What if my qualifier quits? Then the company's legal capacity to perform plumbing work leaves with them. This is the risk almost nobody plans for until it happens; we walk through it in our contractor qualifier contingency plan.

Sources

• Connecticut DCP, Plumbing and Pipefitting Licensing (retrieved 2026-10-16)
• Connecticut DCP, Plumbing Licenses and Scope of Work (retrieved 2026-10-16)
• Connecticut DCP, Plumbing Contractor, Equivalent Experience and Training (retrieved 2026-10-16)
• Connecticut DCP, Plumbing Contractor, Equivalent Out of State License (retrieved 2026-10-16)
• Connecticut DCP, Plumber Continuing Education (retrieved 2026-10-16)
• Connecticut DCP, Heating, Cooling and Sheet Metal Work Licenses (retrieved 2026-10-16)
• PSI Services LLC, Connecticut DCP Occupational Licensing, Plumbing Trades Candidate Information Bulletin (updated February 4, 2026) (retrieved 2026-10-16)
• Connecticut DCP, Mechanical Contractor Registration (repeal notice) (retrieved 2026-10-16)
• Connecticut DCP, Home Improvement Applications (retrieved 2026-10-16)
• Connecticut General Statutes, Chapter 393 (§§ 20-330, 20-333, 20-333a, 20-334, 20-334a, 20-334d, 20-335, 20-337, 20-338, 20-338c, 20-341) (retrieved 2026-10-16)
• Connecticut Department of Labor, Apprenticeship Standards (retrieved 2026-10-16)

Before you file

Every fee, hour and requirement above was verified against the Connecticut Department of Consumer Protection's published licensing pages, the Connecticut General Statutes, and PSI's current Connecticut Plumbing Trades Candidate Information Bulletin on October 16, 2026. These figures are set by the Department, the legislature and the testing vendor, and they change. Verify current amounts and requirements with DCP at DCP.OccupationalProfessional@ct.gov and with PSI before you file or pay anything.

If the real question is not "how do I get licensed" but "how does my company get licensed plumbing work done in Connecticut without waiting years," that is the problem we solve. Call 615-219-2110 to talk it through with our team, see hire a qualifying agent, or browse the state licensing guides.