Kentucky master plumber licensing is administered by the Division of Plumbing in the Department of Housing, Buildings and Construction, under Kentucky Revised Statutes Chapter 318 and the Kentucky State Plumbing Code at 815 KAR Chapter 20 — a state-written code, adopted from no model code. The master examination is Division-administered, with a written portion and a drawing portion, and a candidate must score a minimum of 80 percent on each portion. The PassProfessor Kentucky Master Plumber program prepares candidates for the written knowledge behind that examination — and it states plainly, below, what a written program cannot rehearse.
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What this credential certifies
The Kentucky Master Plumber license is the senior of the only two plumbing licenses Kentucky examines. The structure is deliberately small: Master Plumber and Journeyman Plumber are the examined licenses, there is no Kentucky plumbing contractor license, and there is no apprentice license, registration, or examination — an apprentice is a defined, supervised status, not a credential. This examination is the top of a two-rung structure, and the credential through which plumbing businesses in Kentucky operate.
That last point is structural. Under Kentucky Revised Statutes 318.110, a company engages in the plumbing business only through a connected licensed master plumber in responsible charge, who must notify the department when the connection commences and when it is severed. The master license is thus the license a business runs on, and its examination standard reflects that position: Kentucky sets the master bar higher than the journeyman bar, portion by portion.
For the four eligibility paths and the drawing portion in detail, read the companion guide at /kentucky-master-plumber-exam-guide/.
The examination at a glance
| Item | Verified position |
|---|---|
| Program | Kentucky Master Plumber: the senior of Kentucky’s two examined plumbing licenses; there is no plumbing contractor license |
| Regulator | Division of Plumbing, Department of Housing, Buildings and Construction (DHBC), Public Protection Cabinet, under KRS Chapter 318 and 815 KAR |
| Examination administrator | The Division itself — Division-administered, with no outside examination vendor; registration is direct to the Division on Form PLB-3 |
| Code | 815 KAR Chapter 20, the Kentucky State Plumbing Code — state-written; Kentucky has not adopted the IPC or the UPC in any edition |
| Examination portions | Written portion and drawing portion (inserting the proper pipe size on a prepared drawing; called the “Chart” portion on Form PLB-3) |
| Passing standard | Minimum 80 percent on EACH portion — no averaging across portions |
| Examination schedule | Regular examinations in February, May, August, and November each year |
| Examination fee | $150 for the master examination, payable to the Kentucky State Treasurer |
| License fees | Initial license $250; annual renewal $250 |
| Continuing education | 6 hours in the 12 months before renewal |
| Not published | Question counts, time limits, and book status for the examination are unpublished and are stated nowhere in this package |
| Administrator note | PassProfessor is independent and is not affiliated with the Division of Plumbing or DHBC |
Several lines of that table contradict what generic plumbing material assumes. The sections below take them in order: the code first, because it is Kentucky’s deepest difference; then the portions and the standard; then the disclosure owed about the drawing portion.
A state-written code: Kentucky’s deepest difference
Most plumbing preparation in the United States is organized around two model codes, the IPC and the UPC, with state amendments at the margins. Kentucky fits neither frame. The Kentucky State Plumbing Code is 815 KAR Chapter 20 — written by Kentucky, promulgated under Kentucky Revised Statutes 318.130, using as a minimum standard the basic principles of the National Plumbing Code Coordinating Committee’s final report of 1951. Kentucky has not adopted the IPC or the UPC in any edition, and the common description of its code as “IPC-based” is false.
The consequence is total. A candidate cannot prepare for Kentucky from a model-code book with a Kentucky supplement, because there is no model-code base for a supplement to attach to. The operative texts are the ones the Division itself names for the examination: written questions address the basic principles of plumbing, Kentucky Revised Statutes Chapter 318, 815 KAR Chapter 2, and 815 KAR Chapter 20, alongside the drawing exercise described below. The current compilation is the 2023 Kentucky State Plumbing Law, Regulations and Code Book, carrying the statutes through the 2022 Regular Session; currency in Kentucky is per-regulation rather than a single edition year.
The examination: two published portions, one uncompromising standard
The Division administers the master examination itself. There is no testing company in this process, because no vendor is named in any Kentucky primary source: registration is made directly to the Division on Form PLB-3, with the fee payable to the Kentucky State Treasurer, and the State Plumbers Examining Committee — one DHBC employee, three licensed master or journeyman appointees, and the commissioner serving ex officio — designs the examination requirements while the department licenses. Regular examinations are held each year in February, May, August, and November, with special examinations as the department directs; the department gives notice of the time and place at least one week ahead to each person with an approved registration on file. The regulation states the master-level design principle directly: master requirements shall be more complex than journeyman requirements.
The published portions are two. The written portion examines the basic principles of plumbing and the Kentucky framework named above. The drawing portion — Form PLB-3 calls it “Chart” — requires the candidate to insert the proper pipe size on a prepared drawing indicating all stacks, wastes, and vents and the connected fixtures. Main stacks are weighted more heavily, and scoring deducts for oversized as well as undersized piping: the exercise rewards exact sizing judgment, not generous sizing.
The passing standard is the figure candidates most often get wrong, because they import the journeyman figure. A master candidate must obtain a minimum of 80 percent on each portion (815 KAR 20:030). Each portion stands alone; there is no averaging, so a strong written score cannot carry a drawing score below the line, or the reverse. A passing score remains valid for three years — but an application is void if the examination is not successfully completed within one year from the date of first notice, a deadline the retake section below returns to.
What a written program cannot rehearse — stated plainly
The drawing portion is a performance, not a knowledge test that happens to involve a picture. The candidate is handed a prepared drawing and must produce the sizing decisions on it, under examination conditions, with main stacks weighted most heavily and errors in both directions deducted. A written preparation program, including this one, cannot rehearse that act itself: it cannot hand the candidate the Division’s drawing, and it cannot replicate the scoring of a sizing exercise performed on the spot.
What written preparation can do — and what this program is built to do — is teach everything the drawing portion draws on: the Kentucky code’s sizing principles as written in 815 KAR Chapter 20, and the discipline of exact sizing the deduction rule enforces. But the distinction matters, and this program will not blur it: the drawing portion is prepared for, not practiced here, and candidates should arrange their own drawing practice on plans of their own.
Who may sit: the four master routes
Kentucky’s general conditions come first: an applicant must be at least 18 years old, of good moral character, and a United States citizen or a resident alien authorized to work in the United States. The master qualification itself (815 KAR 20:030) may be met by any one of four routes. First, the home route: a valid journeyman license held for at least two years within the past five years, plus at least two years actively employed in plumbing under a licensed master. Second, the engineering route: a Kentucky-licensed engineer sufficiently experienced in mechanical engineering, as determined by the department. Third, the out-of-state route: a valid plumbing license from another state held for at least two years within the past five years. Fourth, the non-licensing-state route: at least four consecutive years in plumbing, in a master-equivalent capacity, in a state that does not license plumbers. Routes three and four carry an additional proof: those candidates must also demonstrate passing the Kentucky journeyman examination. The reciprocity provision points the same way — the department may license an out-of-state licensee only if that state has a statewide code, its examination is at least equal to Kentucky’s, and it reciprocates. There is no waiver as of right, and no state is named.
Fees, the license year, insurance, and continuing education
The corroborated figures are the Division’s own. The master examination fee is $150, nonrefundable, payable to the Kentucky State Treasurer. The initial master license fee is $250; it may be prorated across a period of not less than seven and not more than eighteen months, because a Kentucky master license expires on the last day of the licensee’s birth month rather than on a single statewide date. Annual renewal is $250, made on Form DHBC L-1 with proof of continuing education and proof of insurance. Inactive status and reactivation each carry a $125 master fee. A late revival fee of $5 applies at the statute layer, and 180 days of nonpayment brings automatic cancellation, after which reinstatement requires the delinquent renewals plus a $10 revival amount. A military fee waiver exists. One further condition is not a fee at all: a master license carries a general liability insurance minimum of $250,000 under Kentucky Revised Statutes 318.030(2).
Continuing education is an annual discipline. Both license classes must complete 6 hours in the twelve months before renewal, under 815 KAR 2:010, in business, job safety, the Kentucky State Plumbing Code, or trade-related subject matter. Safety content is capped at 2 hours per twelve months; one hour means 50 minutes; up to 12 hours may be carried forward into the two successive years. A licensee whose initial license was issued within twelve months of renewal owes no CE for that first renewal, and inactive licensees owe no annual CE but must show the required hours in the twelve months before reactivation.
Attempts and the one-year window
Kentucky’s retake structure is governed by a single window. If the examination is not successfully completed within one year from the date of first notice, the application is void. Inside that window, an applicant who fails to attend or complete it may reschedule or retake without resubmitting the application requirements — except the examination fee, payable in full for a retake of any portion. Beyond the window, the general rule and Kentucky Revised Statutes 318.060 put the candidate on a new application with an additional fee, eligible for the next regular examination. No attempt cap is stated beyond the void rule — with quarterly sittings, the calendar is the real constraint on a Kentucky retake plan.
What the PassProfessor program will cover
The Kentucky code as the syllabus. PassProfessor plumbing programs are composed around the state layer, and Kentucky’s layer is the whole book: 815 KAR Chapter 20 as a state-written code, the licensing framework of Kentucky Revised Statutes Chapter 318, and the regulations at 815 KAR Chapter 2 — the same texts the Division names for its written portion. Material is written from scratch against primary sources, and nothing in it is keyed to the IPC or the UPC, because Kentucky’s examination is not.
The master standard, taught as a standard. The program is built to the master level the regulation states — more complex than the journeyman requirement, passed at 80 percent on each portion with no averaging. Treating the master examination as a longer journeyman examination misreads both its difficulty and its scoring.
Candor about the drawing portion. As stated above, the program teaches the sizing knowledge the drawing portion draws on and discloses, rather than disguises, that the prepared-drawing exercise itself cannot be rehearsed in a written program.
Independence, stated plainly. PassProfessor is an independent preparation provider, not affiliated with the Division of Plumbing or DHBC, and this program is not a Kentucky course. Completing it confers no license; the Division alone licenses and administers the examination.
Tell me when enrollment opens. The Kentucky Master Plumber program is in the works as our catalog expands into the plumbing trades, and enrollment is not yet open. Leave an email address and PassProfessor will write when the program is ready — and only about this program.
Frequently asked questions
Who administers the Kentucky Master Plumber examination?
The Division of Plumbing, in DHBC, administers it directly. There is no examination vendor; registration is made to the Division on Form PLB-3, with the fee payable to the Kentucky State Treasurer.
What code is the examination based on?
The Kentucky State Plumbing Code, 815 KAR Chapter 20 — state-written. Kentucky has not adopted the IPC or the UPC in any edition, and descriptions of its code as IPC-based are incorrect. The written portion addresses the basic principles of plumbing, KRS Chapter 318, 815 KAR Chapter 2, and 815 KAR Chapter 20.
What portions does the master examination have?
A written portion and a drawing portion — called “Chart” on Form PLB-3 — in which the candidate inserts the proper pipe size on a prepared drawing showing all stacks, wastes, and vents and the connected fixtures. Main stacks are weighted more heavily, and deductions apply to oversized as well as undersized piping.
What score passes?
A minimum of 80 percent on each portion, with no averaging (815 KAR 20:030). The journeyman standard is lower; the master figure is 80 percent on each portion.
When are examinations held?
Regular examinations are held in February, May, August, and November, with special examinations as the department directs. The department notifies each approved registrant of the time and place at least one week ahead.
What does the examination cost?
The master examination fee is $150, nonrefundable, payable to the Kentucky State Treasurer. The initial license fee is $250 and annual renewal is $250.
What experience qualifies a candidate?
Most commonly, a valid journeyman license held for at least two years within the past five years plus at least two years actively employed in plumbing under a licensed master. Engineering, out-of-state, and non-licensing-state routes also exist; the out-of-state routes additionally require proof of passing the Kentucky journeyman examination.
Does Kentucky have a plumbing contractor license?
No. Master Plumber and Journeyman Plumber are the two examined licenses, and businesses operate through a licensed master in responsible charge.
What continuing education does renewal require?
Six hours in the twelve months before renewal, in business, job safety, the Kentucky State Plumbing Code, or trade-related subject matter, with safety capped at 2 hours.
When does the license expire?
On the last day of the licensee’s birth month; the initial fee may be prorated across seven to eighteen months to meet that cycle.
Is PassProfessor affiliated with the Division of Plumbing?
No. PassProfessor is an independent preparation provider. The Division alone licenses plumbers and administers the examination.
When does enrollment open?
The program is in the works and enrollment is not yet open. Leave an email address on this page and PassProfessor will write when the program is ready — and only about this program.