Quick Reference Table
Label | Value |
|---|---|
License Type | Commercial Plumbing (Major Classification 7 under Mechanical), Labor Only (Subclass L.1), Residential Construction (as relevant) |
Regulating Agency | Louisiana State Licensing Board for Contractors (LSLBC), State Plumbing Board of Louisiana (LSPB) |
Experience Required | Journeyman: 2,500-4,000 hours plumbing work (see below); Master: Journeyman + 1,500 hours + specific training |
Exams | Written/manual LSPB exam (Journeyman/Master). LSLBC trade exam (waived with Master). Business & Law exam for all. |
Renewal Cycle | LSLBC: annual, 2-year, or 3-year; LSPB: annual (by Dec 31) |
Continuing Education | Journeyman: 6 hours/year; Master: 8 hours/year (see below) |
Fees | Exam: up to $50; Initial license: up to $100; Renewal: up to $100; Non-LA surcharge: up to $400 (as of 2026, verify at Louisiana Revised Statutes) |
Official Links |
Who Must Meet Plumbing License Requirements in Louisiana?
Any contractor performing plumbing work in Louisiana valued at $10,000 or more (including labor and materials) must hold an LSLBC Plumbing license. This requirement applies whether you work as a general contractor, prime contractor, or subcontractor. The LSLBC defines plumbing to include installation, repair, and alteration of both potable and non-potable water and sewer systems inside any building or structure.
The LSLBC also regulates "Labor Only" plumbing contracting for jobs over $10,000 where you only provide labor (no materials or supervision). There are limited exemptions: You do not need a contractor license if you only supply materials, or if you are an architect, engineer, or construction manager who does not actually perform construction. However, if you bid, contract for, or supervise plumbing installation, even as a subcontractor, you must be licensed whenever the $10,000 threshold is met.
For contractors building new single-family homes in Louisiana, a separate Residential Construction classification is required and the standard Plumbing classification does not authorize you to contract for new residential building projects. Make sure to review your full project scope before bidding work in Louisiana.
Plumbing License Types
Louisiana issues several key license types covering plumbing work. The main credential is the Plumbing Major Classification (code 7) under the Mechanical category, regulated by the LSLBC. Most plumbing contractors pursuing commercial and large-scope projects over $10,000 will need this classification.
Plumbing (Major Classification 7): Allows design, installation, and service of all interior potable and non-potable water systems, drainage, venting, and sewer within structures, above the $10,000 threshold. Requires the qualifying party to hold a valid Master Plumber credential issued by the State Plumbing Board.
Labor Only (Subclass L.1): This subclassification allows you to contract for plumbing labor only, with no materials or direct supervision, on projects valued over $10,000. No trade exam is required, but you must follow the regular application process and business & law training.
Residential Construction Classification: For those constructing new single-family homes. Note, this license is broader than plumbing and is not a substitute for the commercial Plumbing or Labor Only license if your project is not residential in nature.
Underlying these contractor licenses are individual plumber credentials issued by the LSPB, including Residential (Limited/Journeyman, soon to be unified as Journeyman), Journeyman, and Master Plumber. These credentials are required for individuals acting as qualifying parties under your contractor license application.
How to Meet Plumbing License Requirements in Louisiana
To meet the plumbing license requirements in Louisiana, you must carefully follow all required steps and provide full documentation.
Obtain the Proper LSPB Credential: The qualifying person on your application must first secure the needed LSPB-issued credential. Journeyman and Master Plumber each require set amounts of supervised experience and must pass LSPB exams. Starting in August 2026, current Residential Limited holders become Journeyman Plumbers by statute update.
Complete Mandatory Training: This may include a 24-hour responsible master plumber course (for Master level) and annual continuing education hours by an approved instructor.
Pass Required Exams: Candidates must pass written and, in some cases, manual skill exams for the LSPB credentials. Contractors that do not designate a Master Plumber must pass the LSLBC trade exam by PSI. All must complete the Business & Law exam.
Prepare Application Documents: Gather all supporting material, such as proof of credential (from LSPB), financial statement, and Business & Law training certificate. Designate the qualifying party who meets all requirements.
Submit Application Online: Create an account and file your commercial contractor license application at the LSLBC portal. Choose Plumbing, Labor Only, or Residential Construction as needed. Upload all required documentation.
Schedule and Take Additional Exams (if not Master): If your qualifying party does not hold a Master Plumber credential, the LSLBC will issue an exam eligibility letter; then, you must schedule and pass the PSI trade test.
Obtain Board Approval and Receive License: The LSLBC reviews your complete application. If approved, your Plumbing contractor license is issued, and you may begin work legally on projects that meet the threshold.
Application Requirements
Applicants pursuing plumbing license requirements in Louisiana must submit several core materials and satisfy background checks set by LSPB and LSLBC. Here is a breakdown of typical requirements.
Experience and Age
The LSLBC does not post a specific age minimum, but the LSPB sets experience/education requirements for each credential. For Journeyman credentials, you need either:
2,500 hours of manual plumbing work as an indentured apprentice under license-holder supervision
4,000 hours of work as an unindentured apprentice, or
1,000 hours plus successful completion of a state-approved community college/technical program
A Master Plumber candidate must already possess a Louisiana journeyman plumber credential and have at least 1,500 hours of additional experience, plus complete a special 24-hour "responsible master plumber" course.
Financial and Background Requirements
Financial Statement: Every commercial plumbing applicant must submit a current financial statement as required by the LSLBC’s checklist. This is part of the online application upload process and is used to verify your business solvency.
Bond and Insurance: The LSLBC does not currently require bonding or specific insurance for plumbing contractors, but other business and project-specific insurance may be needed.
Background Check: There is no explicit fingerprinting or criminal history check requirement listed for plumbing contractors.
Federal Certification: No federal certification (such as EPA 608) is required at present.
Supporting Documentation
Proof of successful LSPB-issued credential (copy of current journeyman or master plumbing license)
Completion certificates for required exams (written, manual, business & law as appropriate)
Designation of the qualifying party, with verification of their credentials
Applicants should follow the LSLBC Initial License Checklist for all forms and uploads.
Exams
The plumbing license requirements in Louisiana require specific exams, depending on your credential route.
The LSPB administers:
A written exam for Journeyman-level plumbing knowledge
A written plus manual skill exam for Master Plumber applicants
Annual continuing education exams or courses (for license renewal credits)
Master Plumber credential holders are exempt from the LSLBC trade exam but must still complete the business & law course. If you do not have the Master Plumber credential, you must pass:
The LSLBC trade exam, administered by PSI Services LLC (as of August 2025), after receiving an eligibility letter
To schedule a PSI test, follow instructions at the LSLBC Test Registration and Scheduling page. Exam content, attempt limits, formats, and passing scores are updated routinely, so you should download the latest PSI candidate bulletin for up-to-date info. LSPB exam details are provided during application.
Fees
Fee schedules are part of the plumbing license requirements in Louisiana. Numerous fees apply at both the contractor and plumbing board levels.
LSLBC Exam Fee: up to $50 (as of 2026, confirm at Louisiana law)
LSLBC Initial License Fee: up to $100 (as of 2026, verify at fee schedule)
Annual Renewal: up to $100 each period (as of 2026, verify at fee schedule)
Non-Louisiana Surcharge: up to $400 (as of 2026, see above statute)
LSPB Journeyman/Master Exam, initial, and renewal fees: check at the State Plumbing Board; statutory master plumber renewal is $100 per renewal (as of 2026, see HB953)
If your LSPB credential lapses, you may owe a separate revival fee (details set yearly by the LSPB).
Always verify the LSLBC official schedule and SPBLA fee postings before applying; amounts can change.
Renewal and Continuing Education
Meeting renewal and continuing education requirements is a crucial part of plumbing license requirements in Louisiana. Failing to renew on time means you must reapply and cannot legally perform regulated work.
LSLBC License Renewal
The LSLBC licenses renew either annually, every two years, or every three years based on your selection. If your license expires for more than one year you cannot renew and must apply as a new applicant. Renewal is available online through your contractor portal account.
LSPB Plumber Credential Renewal
Journeyman and Master Plumber credentials must be renewed with the State Plumbing Board every year by December 31. If not renewed by the close of the year, you can revive the credential (with additional fees) until March. After March, expired licensees must follow board procedure for reinstatement, which may require new exams or applications.
Continuing Education Requirements
Master Plumbers must complete eight hours of board-approved professional education per year. Journeyman Plumbers (including those transitioning from the Residential Limited) must complete six hours per year. These must be given by an instructor registered and approved by the board. Course outlines change as new rules are published in the Louisiana Register.
Failure to complete continuing education bars license renewal and can require additional board actions before reinstatement.
Reciprocity
For contractors licensed in other states seeking to work in Louisiana, the LSLBC may offer license by reciprocity. You must submit the appropriate reciprocity request form and supply verification of your active license in the reciprocal jurisdiction (state verification required). The State Plumbing Board's approach to reciprocity is not detailed in the public materials. Applicants pursuing transfer or equivalency of Journeyman or Master credentials should contact the LSPB directly through their website for criteria and application forms. The LSLBC's reciprocity page provides guidance for equivalency requests.
Reciprocity is not automatic, and all required Louisiana testing, documentation, or experience evaluations may still apply. Therefore, start the process early if you are an out-of-state contractor or master plumber.
