- KY-MP is the Kentucky Master Plumber License Exam, administered through the Division of Plumbing at DHBC.
- The exam has two portions: Written and Chart, each requiring at least 80% to pass.
- Total testing time is 2 hours 30 minutes; the exam fee is $150 per attempt.
- Eligibility requires a journeyman license held for two of the last five years plus two years working under a licensed master.
What Is KY-MP?
KY-MP stands for the Kentucky Master Plumber License Exam, the state-administered credentialing test that licensed journeyman plumbers must pass before they can legally operate, supervise, or contract plumbing work in Kentucky as a master plumber. This is not a national trade association credential or a generic industry certification - it is a state examination tied directly to Kentucky Revised Statutes and Kentucky Administrative Regulations, and passing it is a legal prerequisite for holding a Kentucky master plumber license.
If you searched "what is KY-MP" expecting a quick definition, here it is in one sentence: KY-MP is the two-part exam (Written and Chart) that the Kentucky State Plumbing Examining Committee uses to verify that an experienced journeyman plumber has the code knowledge and layout skills required to practice at the master level. For a deeper breakdown of exactly what each portion covers, see the KY-MP Exam Domains 2026: Complete Guide to All 2 Content Areas.
Who Administers the KY-MP Exam
The exam is administered by the Kentucky Department of Housing, Buildings and Construction (DHBC), Division of Plumbing. The actual content of the exam is designed by the State Plumbing Examining Committee, a body established under Kentucky law specifically to develop and oversee the master and journeyman plumbing examinations. This distinguishes KY-MP from private certification exams you might find associated with the same acronym elsewhere - there is no independent testing vendor or national board involved. Everything traces back to DHBC and Kentucky's own regulatory framework.
DHBC publishes the governing code directly: the 2023 Kentucky State Plumbing Law, Regulations and Code booklet is the primary study source linked from the department's site, and it consolidates the statutes and administrative regulations that the Written portion draws from.
Key Takeaway
Because DHBC and the State Plumbing Examining Committee control both the exam and the code references, your single best primary source is the department's own published law and regulation booklet - not generic plumbing trivia.
The Two KY-MP Exam Domains
Unlike broader trade exams with many content areas, KY-MP is built around exactly two official examination portions. Both must be passed independently, and both draw on real job-site knowledge rather than abstract theory.
Domain 1: Written
The Written portion tests plumbing principles alongside specific Kentucky legal references: KRS Chapter 318, 815 KAR Chapter 2, and 815 KAR Chapter 20. Candidates are expected to know not just how plumbing systems work, but how Kentucky law and administrative regulation govern licensing, installation standards, and enforcement.
- Statutory framework under KRS 318 governing plumbing licensure in Kentucky
- Administrative code requirements found in 815 KAR Chapter 2
- Master-level regulatory provisions in 815 KAR Chapter 20, including alternative qualification routes
- General plumbing principles applied within a legal/code context, not just installation mechanics
Domain 2: Chart
The Chart portion is a hands-on layout exercise: candidates must insert correct pipe sizes onto a prepared drawing showing stacks, wastes, vents, and the fixtures connected to them. This portion rewards precision over guesswork.
- Main-stack sizing carries greater grading weight than other elements on the drawing - get this right first
- Both oversized and undersized pipe entries can cost you credit, so "bigger is safer" is a losing strategy
- You must correctly interpret how fixtures connect to wastes and vents before assigning any size
- Systematic, top-down reading of the drawing reduces sizing errors under time pressure
For a full walkthrough of how these two domains interact and how much time to budget for each, read the KY-MP Exam Domains 2026 guide. If you're still gauging overall difficulty before committing to a study plan, the How Hard Is the KY-MP Exam? Complete Difficulty Guide 2026 is a useful companion read.
| Portion | Focus | Passing Standard |
|---|---|---|
| Written | Plumbing principles, KRS 318, 815 KAR Ch. 2 & Ch. 20 | 80% minimum |
| Chart | Pipe sizing on stacks, wastes, vents, fixtures | 80% minimum |
Eligibility Requirements
KY-MP is not an entry-level exam. Kentucky sets a defined experience floor before you're even permitted to register.
- Be at least 18 years old
- Hold a journeyman plumber license for at least two of the preceding five years
- Have at least two years actively working under a licensed master plumber
Kentucky also recognizes engineer and out-of-state alternative pathways, defined under 815 KAR 20:030. The out-of-state routes carry an added condition: applicants must also provide proof of having passed the Kentucky journeyman examination, so an out-of-state master license alone doesn't automatically satisfy Kentucky's requirements. Full detail on how each pathway works, including documentation expectations, is covered in KY-MP Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Registration, Fees & Scheduling
The mechanics of registering for KY-MP are specific enough that missing a deadline or a form detail can push your exam attempt back an entire testing cycle.
- Exam fee: $150 per attempt
- Application timing: submit a complete examination application at least three weeks before the scheduled exam date
- Required form: PLB-3, which requires a recent passport-sized color photograph
- Regular exam months: February, May, August, and November
- Application validity: becomes void if not completed successfully within one year of the first notice of examination
- Score validity: a passing score remains valid for three years
Because the state only runs the exam four times a year, missing a submission window by even a few days can mean a three-month delay before your next opportunity. Detailed month-by-month scheduling logistics, plus what "first notice of examination" actually means for your one-year clock, are laid out in KY-MP Exam Dates 2026: Testing Windows, Deadlines & Scheduling. For a complete cost breakdown covering the exam fee alongside licensing and renewal costs, see KY-MP Certification Cost 2026: Complete Pricing Breakdown.
Passing Score & Scoring Mechanics
KY-MP uses a straightforward but strict passing standard: you need at least 80% on each portion separately - Written and Chart. Scoring well on one does not offset a weak score on the other; both must independently clear the 80% line. Total time allotted for the full exam is 2 hours 30 minutes, covering both portions.
On the Chart portion specifically, grading isn't pass/fail per pipe - main-stack sizing carries more weight than secondary runs, and errors in either direction (oversizing or undersizing) reduce your score. This means a candidate who "plays it safe" by oversizing pipes throughout the drawing can still lose meaningful credit. For the exact scoring logic and how examiners weight different drawing elements, read KY-MP Passing Score 2026: Exactly What You Need to Pass. If you want context on how candidates generally perform against this standard, KY-MP Pass Rate 2026: What the Data Shows is worth reviewing.
Key Takeaway
Treat Written and Chart as two separate exams that happen to be scheduled together. A strong Written score cannot rescue a failed Chart score, and vice versa.
After You Pass: License & Renewal
Passing KY-MP is the exam milestone, but it's not the finish line for practicing as a master plumber in Kentucky. Licensing carries its own fee structure and ongoing obligations:
- Master license base fee: $250, with proration for initial terms of seven to eighteen months
- Annual renewal: $250, due at the end of your birth month
- Renewal requirements: proof of insurance and six approved continuing education (CE) hours completed in the preceding 12 months
- CE exemption: your very first renewal is exempt from the CE requirement if the license was issued within the preceding 12 months
These renewal mechanics matter for planning: a newly licensed master doesn't need to scramble for CE credits before their first renewal, but every renewal after that does require the six hours plus current insurance documentation. The full fee application form (PLB-1) and license issuance details are published directly by DHBC.
Who Hires Kentucky Master Plumbers
A Kentucky master plumber license - unlocked by passing KY-MP - is the credential that allows someone to legally pull permits, supervise journeymen and apprentices, and operate or lead a plumbing contracting business in the state. In practice, holders of this license are sought by:
- Established plumbing contracting companies looking to add a licensed supervisor or branch lead
- General contractors on commercial and residential builds who need a master plumber of record for permitting
- Property management and facilities companies overseeing multi-unit or institutional plumbing systems
- Plumbers planning to start or expand their own licensed contracting business in Kentucky
Because the license is a legal requirement rather than an optional credential, demand for it tracks directly with Kentucky's construction and renovation activity. For a broader look at how this license translates into job opportunities and career paths, see KY-MP Jobs, and for the financial upside of holding it, KY-MP Salary Guide 2026: Complete Earnings Analysis and Is the KY-MP Certification Worth It? Complete ROI Analysis 2026 both go deeper into the value question.
Preparing for Each Domain
Because KY-MP has only two domains, your prep plan doesn't need to be complicated - but it does need to respect how differently the two portions test you. Written rewards code memorization and comprehension; Chart rewards careful, repeated practice reading and sizing drawings under time pressure.
Written Foundation
- Work through KRS Chapter 318 and 815 KAR Chapter 2 section by section
- Build a personal reference sheet of definitions and licensing rules you keep mixing up
815 KAR Chapter 20 Deep Dive
- Focus on master-level provisions and the engineer/out-of-state alternative pathways
- Review the 2023 Kentucky State Plumbing Law, Regulations and Code booklet directly from DHBC
Chart Drills
- Practice sizing stacks, wastes, and vents on blank drawings repeatedly
- Prioritize main-stack accuracy first, since it carries greater grading weight
Timed Combined Runs
- Simulate the full 2 hour 30 minute session with both portions back to back
- Confirm your PLB-3 application and photo are already submitted well before the three-week deadline
Notice the sequencing: Written comes first because it's dense with legal reference material that benefits from repetition over weeks, while Chart benefits more from short, frequent drawing drills closer to your test date. For a fully detailed week-by-week plan built specifically around these two domains, see the KY-MP Study Guide 2026: How to Pass on Your First Attempt. And if you want a condensed, single-page reference to review in your final days, the KY-MP Cheat Sheet 2026: One-Page Review of Must-Know Facts is built for that purpose. You can also sharpen your Chart-portion instincts and Written recall with timed practice questions on our practice test platform before test day.
Frequently Asked Questions
KY-MP stands for the Kentucky Master Plumber License Exam, administered by the Kentucky Department of Housing, Buildings and Construction, Division of Plumbing.
Two: a Written portion covering plumbing principles and Kentucky code (KRS 318, 815 KAR Chapters 2 and 20), and a Chart portion requiring correct pipe sizing on a prepared drawing.
You need at least 80% on the Written portion and at least 80% on the Chart portion separately; passing one does not compensate for a lower score on the other.
The exam fee is $150 per attempt. Beyond the exam itself, the master license carries a $250 base fee and $250 annual renewal, separate from the testing fee.
Regular examination months are February, May, August, and November. Applications must be submitted at least three weeks before the scheduled exam date.