Missouri Plumber License Requirements (2026) | Kansas City + St. Louis Guide

Missouri has no statewide plumber license. There is no state plumbing board, no state journeyman or master credential, and no statewide examination. Plumbing is regulated entirely through municipal programs operating under home-rule authority. Kansas City (Code Compliance Division) licenses Journeyman and Master Plumbers and issues Plumbing Contractor business licenses. The City of St. Louis (Building Division) issues plumbing permits and registers plumbers under the supervision of the St. Louis Plumbing Inspector. St. Louis County, Springfield, and Columbia each run independent plumbing programs. Some smaller Missouri cities rely on voluntary journeyman registration with no separate business license. A multi-city plumbing contractor must hold credentials in every jurisdiction where the work is performed.

Governing Authority

Under Kansas City Code of Ordinances Chapter 18 (Buildings and Building Regulations), City of Kansas City, Missouri — Code Compliance Division, Department of City Planning and Development (KCMO) is the body that issues this license and enforces compliance with it. Kansas City Code Compliance Division licenses general contractors, master and journeyman electricians, master and journeyman plumbers, and mechanical (HVAC) contractors operating inside KCMO city limits. It administers examinations, issues permits, and enforces the adopted building, electrical, plumbing, and mechanical codes.

Official portal: https://www.kcmo.gov/city-hall/departments/city-planning-development
Address: 414 E 12th Street, 16th Floor, Kansas City, MO 64106
Phone: (816) 513-1500

Eligibility Requirements

To qualify, an applicant must have reached age 18 and hold a valid Social Security Number. No statewide residency requirement. Kansas City and St. Louis both require a Missouri business address or registered agent for the contracting entity.

Good moral character

Both Kansas City Code Compliance and the St. Louis Building Division review each applicant individually. Prior license revocations, felony convictions, and unpaid municipal judgments are grounds for denial.

Background investigation

Kansas City requires a criminal history disclosure on the Master Plumber application. St. Louis may run a background check on principal officers.

Experience & Education Matrix

Plan to substantiate 5 years of Kansas City Master Plumber: Journeyman Plumber credential (four years / 8,000 hours of qualifying experience) plus one additional year as a Journeyman before sitting the Master exam. St. Louis City: comparable five-year Master Plumber experience path with separate Journeyman registration. with hard records. Payroll, tax, project logs, and supervisor verification are what the board relies on when it reviews the claim.

Accepted proof of experience or eligibility

Kansas City Code Compliance Experience Affidavit signed by each supervising Master Plumber
W-2 statements, pay stubs, or 1099 records covering the qualifying period
Approved plumbing apprenticeship completion certificate (where applicable)
St. Louis City Plumbing Inspector verification of journey hours

Education substitution

U.S. Department of Labor-registered plumbing apprenticeship satisfies most of the Journeyman hour requirement in both Kansas City and St. Louis. Accredited plumbing or construction technology coursework may substitute for additional hours at the examiner's discretion.

Examination Structure

Kansas City: Block Exam Services. St. Louis City: St. Louis Plumbing Inspector's office administered exam. Each city runs its test independently. runs the examination for this credential. Issuance is contingent on passing every part below:

Kansas City Master Plumber Examination — Uniform Plumbing Code, KCMO amendments, and business and law — 100 questions, 240 minutes, passing score 75%
St. Louis City Master Plumber Examination — adopted plumbing code, city amendments, and business and law — 100 questions, 240 minutes, passing score 75%

Examination fee: $150 per exam in Kansas City; St. Louis City exam fees are comparable.

Retake policy: Failed exams may be retaken after a 30-day waiting period by paying a new fee.

Insurance & Financial Security

A contractor license surety bond of $25,000, on the KCMO's prescribed form, is a precondition to issuance.

General liability

Kansas City requires a $25,000 surety bond plus general liability insurance for a Plumbing Contractor business license. St. Louis City requires general liability coverage. Typical minimum is $500,000 – $1,000,000 per occurrence.

Workers' compensation

Missouri requires workers' compensation insurance for any construction employer with one or more employees under Mo. Rev. Stat. §287.030.

Additional financial requirements

No state financial statement requirement. Neither Kansas City nor St. Louis requires a net-worth statement for a plumbing contractor license.

Application and License Fees

Fee	Amount
Application (non-refundable)	$200
Examination	$150
Initial license	$300
Renewal (every year)	$300

Maintenance & Renewal

Expect to renew the Missouri Plumber (Municipal — Kansas City Master Plumber + St. Louis City Plumbing) every year. Renewal currently costs $300. Annual renewal in both Kansas City and St. Louis. Surety bond and insurance must be active at renewal.

Continuing education: Kansas City requires periodic plumbing code update training when a new code edition is adopted. St. Louis may require code update CE.

Downloadable Asset

2026 Missouri Plumber License Roadmap (PDF) — a printable step-by-step checklist for the application process.

Download the PDF roadmap →

Reciprocity and Endorsement

Missouri does not accept the NASCLA Accredited Examination for this classification.

Reciprocal State	Accepted Exam	Conditions
No formal bilateral reciprocity agreements identified.

Missouri has no state plumbing credential, so traditional state-to-state reciprocity does not apply. Some Missouri cities will waive portions of the exam for Master Plumbers holding credentials from substantially equivalent programs in other cities or states, but each waiver is discretionary. There is no automatic reciprocity between Kansas City and St. Louis.

Weighing more than one jurisdiction? The national hub compares Plumber license requirements in every state — exam, bond, fee, and experience thresholds side by side.

Step-by-Step Application Roadmap

Identify every Missouri jurisdiction for the work. No state license. Kansas City, St. Louis City, St. Louis County, Springfield, and Columbia each run separate plumbing programs.
Earn a Journeyman Plumber credential. Kansas City and St. Louis both require four years / 8,000 hours of qualifying plumbing experience and passing a Journeyman examination.
Document one additional year of journey-level work. Both cities require one year as a credentialed Journeyman before sitting the Master Plumber exam.
Pass the Kansas City Master Plumber examination. Score 75% or better on the 100-question exam covering the UPC, KCMO amendments, and business and law.
Obtain the Kansas City Plumbing Contractor business license. File the business license application with Master Plumber designation, $25,000 surety bond, general liability and workers' comp certificates.
Add St. Louis City and St. Louis County credentials. Sit the St. Louis City Master Plumber exam and file the county-level plumbing contractor application for work inside St. Louis.
Maintain annual renewals across all jurisdictions. Calendar each city separately. Lapses freeze plumbing permits until renewal is processed.

Common Filing Mistakes

Working from the cited board instructions, here are the snags most likely to trip up a Missouri Plumber filing.

Assuming a state plumber license exists

Missouri has no state credential. Contractors who search for a state board waste weeks. Go straight to Kansas City Code Compliance or the St. Louis Plumbing Inspector.

Skipping the Journeyman prerequisite

Kansas City and St. Louis both require the Journeyman credential before the Master exam. Direct-entry to Master is not allowed.

Forgetting the surety bond

Kansas City requires a $25,000 surety bond for Plumbing Contractor business licensure. Missing bonds stall applications.

Confusing City of St. Louis with St. Louis County

Two different governments, two different plumbing programs. License footprint must match jobsite footprint exactly.

Missing annual renewal in any city

A lapse in any single municipality freezes permits there. With KC, STL City, STL County, and Springfield all renewing on different dates, a calendar system is mandatory.

Study and Reference Materials

What follows are the regulator-cited and commonly used preparation references for this trade. They appear here for convenience only; CLR takes no compensation for them.

Uniform Plumbing Code (current adopted edition) — International Association of Plumbing and Mechanical Officials. Primary technical reference for Kansas City and most Missouri cities. Open-book at the exam.
Kansas City Code of Ordinances Chapter 18 — Plumbing Code amendments — City of Kansas City, Missouri. Direct source for KCMO plumbing amendments and inspection rules.
Audel Plumbers Pocket Manual and Master Plumber Exam Prep — Audel / Wiley. Widely used prep for Missouri municipal Master Plumber exams.

Pre-Submission Checklist

The most critical documents or confirmations the applicant should have in hand before filing with KCMO:

☐ Journeyman Plumber credential (prerequisite)
☐ Documentation of one year of journey-level experience
☐ Kansas City Master Plumber exam pass certificate at 75%+
☐ $25,000 surety bond (Kansas City Plumbing Contractor)
☐ General liability insurance certificate
☐ Missouri workers' compensation certificate (required at one employee)
☐ St. Louis City Master Plumber application (if working in St. Louis)

Other Missouri Trade Licenses

If the Plumber license is not the right fit, the following published Missouri trade guides are also covered by CLR:

Frequently Asked Questions

Does Missouri have a state plumber license?

No. Missouri has no state plumbing board and no state credential. All plumber licensing is municipal — Kansas City, St. Louis City, St. Louis County, Springfield, and other cities each run independent programs.

What is the Journeyman-to-Master path in Kansas City?

Four years (8,000 hours) of qualifying plumbing experience plus passing the Journeyman exam, followed by one additional year as a credentialed Journeyman and passing the Master Plumber exam at 75% or better.

Do I need a license in both Kansas City and St. Louis?

Yes if you plan to work in both cities. A Kansas City Master Plumber credential has no automatic weight in St. Louis and vice versa. Each city runs its own exam, bond, and license.

Is there a Missouri journeyman registration separate from the contractor license?

Yes, at the city level. Kansas City and St. Louis both register Journeyman Plumbers separately from Master Plumbers and Plumbing Contractors. The Journeyman credential authorizes you to perform work under supervision; the Master and Contractor credentials authorize running the business.

How often do Missouri municipal plumbing licenses renew?

Annually in both Kansas City and St. Louis. Renewals require current insurance, current bond (Kansas City), and the annual fee.

Primary Sources

Regulatory requirements on this page are drawn from the official board, statute, and exam-provider materials listed below.

Verified 2026-04-30 · Next scheduled review 2026-07-29