Plumbing Contractor License in Louisiana: Requirements, Qualifier, Bond and Exams

Yes, statewide — and through two agencies at once.

Louisiana has no separate SPBLA plumbing contractor license: the State Plumbing Board of Louisiana licenses plumbing statewide, and a plumbing business operates as an employing entity under a designated Responsible Active Master Plumber.

On top of that, the Louisiana State Licensing Board for Contractors requires a state contractor license for electrical, mechanical or plumbing projects exceeding $10,000 including labor and materials, so a plumbing company over that line holds both.

Statewide-licensed plumbing contractors are exempt from local examination requirements and may work in any local jurisdiction after paying local fees.

Two boards, two different credentials.

The State Plumbing Board of Louisiana (SPBLA) issues the plumber licenses themselves — residential, journeyman and master — registers apprentices, and recognizes the employing entity behind them; it has no contractor classes to choose between.

The Louisiana State Licensing Board for Contractors (LSLBC) issues the state contractor license, and its Plumbing classification is code 7 on the classifications list.

Plumbing (7) is a credential classification: instead of an LSLBC trade exam, the qualifier's Louisiana Master Plumber license is the credential.

The rule also catches mechanical contractors: a mechanical contractor that performs plumbing work of $10,000 or more must also hold an SPBLA master plumber license.

Once the business operates, its job-site signs, service vehicles, advertising and invoices must carry the employing entity's name, address, phone number and Louisiana Licensed Master Plumber (LMP) number — in letters at least 2 inches high on signs and vehicles.

The qualifier is a Master Plumber.

SPBLA requires one designated Responsible Active Master Plumber for each company — a company may employ more than one Active Master, but a master may designate no more than one employing entity at a time, so a master already tied to another company cannot qualify yours.

The master license is earned, not bought: an applicant must hold a current Louisiana Journeyman Plumber license (or be a licensed professional engineer) and pass the board's Master Plumber exam.

Under that sits the journeyman gate — 7,000 hours of plumbing work for an apprentice in a Louisiana Workforce Commission-approved (indentured) program, or 8,000 hours for an unindentured registered apprentice, under the direct supervision of a licensed journeyman or master.

On the LSLBC side, every license applicant must also designate a qualifying party for the classification and for the Louisiana business and law requirement.

That qualifying party can be any principal or a full-time employee — an employee qualifying party must work at least 32 hours per week, meeting the IRS definition of an employee.

The unusual answer for plumbing is that there is no LSLBC trade exam to pass.

Because Plumbing (7) is a credential classification, the SPBLA Master Plumber license stands in its place — so the exams your qualifier faces are the board's own.

SPBLA runs its exams itself in Baton Rouge and Shreveport rather than through a testing vendor.

Its Master Plumber exam is a three-part written exam covering the 2021 International Plumbing Code and International Residential Code, Louisiana Sanitary Code Part XIII (sewage disposal), and business and law based on the NASCLA Louisiana Master Plumbers and Master Natural Gasfitters Guide, 2nd ed.; the application fee is $110.

The LSLBC layer adds its own Business and Law requirement: a one-hour online course ending in an exam on the course contents, with a $150 course fee as of the form revised January 30, 2026.

For contrast, applicants for LSLBC's mechanical classification do sit a trade exam — all LSLBC trade exams have been administered by PSI since August 5, 2025 — and NASCLA exam credit covers only LSLBC's Building Construction/Residential Construction and Electrical exams, not the mechanical trade exam.

The confirmed financial requirements are insurance and net worth, not a bond.

At the SPBLA layer, a master plumber's employing entity must carry workers' compensation, motor-vehicle liability insurance at the legal minimum, and comprehensive general liability and property damage insurance of at least $500,000 aggregate; the statute ties this to active masters, and does not apply to inactive master licenses.

At the LSLBC layer, a commercial license applicant must submit a financial statement showing at least $50,000 net worth, current within 12 months — an irrevocable letter of credit can substitute.

Our reading of both boards' pages found no surety bond minimum for either layer; that is an absence in the sources we read rather than a board statement, so ask both boards what applies to your company before you bid.

The recurring cost your qualifier carries is the Master Plumber license: $190 active (tied to a company) or $40 inactive, renewed before December 31 every year, with 5 hours of continuing professional education before each renewal — journeymen and residential plumbers renew on the same December 31 cycle with 3.5 hours of CPE.

Registering each apprentice you hire costs $20 and renews every December 31.

The LSLBC license renews on your choice of a one-, two- or three-year term and expires on the anniversary of original issue; renewal opens 60 days before expiry and is impossible once the license has been expired more than one year.

Statute caps LSLBC fees at $50 for an exam, $100 for a license and $100 for a renewal, and adds a further $100 fee on each license renewal — the board's current fee schedule was not found in our research, so confirm costs with LSLBC.

Budget $150 for the Business and Law course (fee as of the form revised January 30, 2026).

There is no LSLBC continuing-education requirement for commercial licensees; only residential building contractors complete 6 CE hours a year.

Split the question in two, because the layers answer it differently.

At LSLBC, the old state-by-state agreements are gone: since October 23, 2024, the board accepts a trade exam you passed in any other state — with no waivers, exemptions or grandfathering in effect — for an equivalent Louisiana classification, and it declared every previous agreement null and void.

When that leaves a qualifying party with no LSLBC trade exam to take, a $150 Exam Research/Waiver Fee applies.

For plumbing, though, that layer is beside the point for the Plumbing classification, because it has no trade exam to waive into.

The binding test is SPBLA's, and there the door is narrow: the board does not reciprocate Master licenses at all, and says it reciprocates only journeyman plumber and natural gas licenses, only with Arkansas and Texas.

An out-of-state plumber whose license required at least 8,000 hours can qualify to sit the Louisiana journeyman exam.

Out-of-state contractors may also be charged a surcharge of up to $400.

Losing your master is not a paperwork detail: SPBLA requires each company to have a designated Responsible Active Master Plumber, and because a master can designate no more than one employing entity at a time, your replacement must be a master who is not already designating another company.

The master must report an employment change to SPBLA within 30 days; our research did not find an explicit board deadline for the company to name a replacement, so ask the board how long you can operate and line up the next qualifier before the current one steps down.

The LSLBC license runs its own clock: when the qualifying party is no longer associated with the license, the board must be notified within 30 days and another qualifying party must qualify within 60 days — until then the company may continue existing work and bid on new work in the classification, but may not begin new work.