Who licenses plumbing contractors in Mississippi?
The Mississippi State Board of Contractors licenses plumbing at the contractor-business level. Its classifications page places plumbing in two lanes: commercial and residential.
Mechanical is a major classification that includes plumbing work. Plumbing is also a test-required specialty classification covering commercial and residential plumbing systems. On the residential side, MSBOC lists Residential Plumbing and Residential Mechanical.
This is different from an individual apprentice, journey, and master ladder. The state path described by MSBOC starts with the company, the work scope, and a qualifying party. For the general structure used in other states, see our plumbing license guide.
When is an MSBOC license required?
The MSBOC licensing FAQ says contractors and subcontractors performing work on commercial jobs over $50,000 need a commercial license. It separately requires an MSBOC license for new residential construction over $50,000 and residential remodeling or additions over $10,000.
Plumbing subcontractors face a broader residential rule: subcontractors performing residential plumbing work on a residential construction or improvement project must be licensed by MSBOC. The FAQ does not attach the same $10,000 wording to that trade-subcontractor sentence.
Do not choose a classification from the project value alone. First decide whether the job is commercial or residential, then match the actual plumbing scope to the classification list.
Commercial plumbing: Mechanical or Plumbing specialty
MSBOC lists Mechanical as a test-required major classification that includes plumbing work alongside HVAC, refrigeration, piping, boilers, and related systems. This is the broad commercial route when the company needs more than plumbing authority.
The test-required Plumbing specialty covers installation, maintenance, and repair of commercial and residential plumbing systems. Its published scope includes sanitary and storm drainage, venting, water supply, septic tanks, wells, pool piping, irrigation, medical-gas systems, standpipes, sprinklers, and incidental excavation.
MSBOC says the Plumbing specialty does not include fuel-gas or boiler systems. That exclusion is the practical dividing line: a contractor whose work reaches those systems should not assume the narrower Plumbing specialty covers the full bid.
Residential Plumbing vs Residential Mechanical
Residential Plumbing is test-required and limited to installation, maintenance, and repair of residential plumbing systems. Residential Mechanical requires both the Residential HVAC test and the Residential Plumbing test, and its scope is limited to residential HVAC and plumbing work.
| Classification | Published scope | Test note |
|---|---|---|
| Residential Plumbing | Residential plumbing only | Residential Plumbing test required |
| Residential Mechanical | Residential HVAC and residential plumbing | Residential HVAC and Residential Plumbing tests required |
Choose Residential Plumbing if the company stays in plumbing. Choose Residential Mechanical when the contracted scope genuinely combines residential HVAC and plumbing. Neither residential classification substitutes for a commercial classification.
Application and qualifying-party requirements
Start with the appropriate application on the MSBOC forms page. The page provides separate commercial and residential applications and says each completed application must be notarized before it is mailed to MSBOC.
The qualifying party is the person who takes the required examination for the company. According to the MSBOC FAQ, an owner, officer, or responsible managing employee may take the exam on behalf of the company. A company may use more than one qualifying party and assign different qualifiers to different classifications.
A qualifying party may serve no more than three separate entities without first appearing before the Board and receiving special permission. Build the application around the real company relationship, not a borrowed qualifier.
Exams, fees, and insurance
The MSBOC testing guide says the Mississippi Law and Business Management exam is required for all applicants. A trade exam may also be required by classification, and MSBOC marks Mechanical, Plumbing, Residential Plumbing, and Residential Mechanical as test-required.
Applicants submit the license application before testing. MSBOC reviews it, notifies PSI of eligibility, and then PSI sends confirmation. All exams are administered by PSI and are open book.
MSBOC links its downloadable Schedule of Fees from the official forms page. Use that document for the application and renewal amounts rather than relying on an old third-party price. Our contractor license cost guide can help you budget the other expenses that sit around the board fee.
Insurance is not optional for an active license. All license and renewal applicants must provide proof of general liability coverage. The MSBOC FAQ says commercial applicants need at least $300,000 per occurrence and $600,000 aggregate, while residential license holders have no stated minimum coverage amount.
Reciprocity waives an exam, not the license
MSBOC reciprocity applies only to waiver of a trade-exam requirement. It does not waive the application or Board review, and every applicant must take the Mississippi Business and Law exam.
The plumbing routes are specific:
- Alabama Plumbers & Gas Fitters Examining Board can support waiver of the commercial Plumbing exam only.
- Ohio Construction Industry Licensing Board can support exam waivers for Plumbing and listed related trades.
- South Carolina Residential Builders Commission can support waiver of Residential Plumbing.
- Tennessee Board for Licensing Contractors is the only listed state that waives Mechanical and Plumbing.
Each agreement has conditions tied to the current license, examination history, and disciplinary record. Reciprocity is a shorter testing path, not automatic authority to work.
Mississippi plumbing license FAQ
Does MSBOC issue a statewide journeyman plumber license? MSBOC publishes contractor classifications rather than an individual apprentice, journey, and master ladder. Its state plumbing paths are Mechanical, Plumbing, Residential Plumbing, and Residential Mechanical.
Who issues a Mississippi plumbing contractor license? The Mississippi State Board of Contractors issues the contractor license. The correct classification depends on whether the scope is commercial or residential and whether it extends beyond plumbing.
What exams do Mississippi plumbing contractors take? Every applicant takes Mississippi Law and Business Management. A required trade exam depends on the selected classification, and PSI administers the exams after MSBOC confirms eligibility.
Does reciprocity waive the full Mississippi licensing process? No. It can waive an eligible trade exam only. The applicant still completes the MSBOC application, takes Mississippi Business and Law, and goes through Board review.