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

Yes — statewide, and at state level the license attaches to the business rather than to each plumber.

The Mississippi State Board of Contractors (MSBOC) requires all contractors and subcontractors performing work on commercial jobs over $50,000, including equipment installation, to hold a commercial MSBOC license — the Certificate of Responsibility.

Subcontractors performing residential plumbing work on a residential construction or residential improvement project must be licensed by MSBOC too, and MSBOC's FAQ states no dollar threshold for those residential trade licenses.

For your crew it is different: our research found no statewide license for individual plumbers — an absence inferred from MSBOC's contractor-only classification list, and the municipal licenses our research saw surfaced only in secondary sources we could not verify — so check locally where the work is done.

Our Mississippi plumbing license guide for individuals covers the worker side.

The issuing agency is the Mississippi State Board of Contractors (MSBOC), which issues commercial licenses as the Certificate of Responsibility in classifications.

For a plumbing contractor the commercial choices are the Plumbing specialty — marked Test Required on MSBOC's classification list — whose scope covers sanitary and storm drainage, venting, water supply, septic tanks, medical gas and related piping, but not fuel gas or boiler systems; or the Mechanical major classification, which covers heating, cooling, refrigeration, ductwork and plumbing work.

On the residential side the classes are Residential Plumbing (Test Required) and Residential Mechanical, the latter including plumbing alongside HVAC.

That fuel-gas and boiler exclusion is the plumbing-specific boundary to check: our research captured neither classification's fuel-gas scope beyond the exclusion itself, so ask MSBOC which classification carries the gas-piping or boiler work you sell.

Mississippi calls the qualifier the qualifying party, and MSBOC is specific about who it can be: an owner, officer or responsible managing employee of the business.

One person can qualify at most 3 companies at once (a 4th needs the Board's special approval), and a company may have different qualifiers for different classifications — so the classifications a shop holds do not all have to hang on the same person.

What our research did not find is a stated years-of-experience requirement for the qualifier: the MSBOC pages we read name who can qualify without spelling out experience, so confirm the current experience and examination expectations with the Board before you staff the role.

Two exam layers, both set by MSBOC: every applicant must pass the Mississippi Law and Business Management exam plus any required trade exam, and all exams are administered by PSI and are open book.

The two classifications named for plumbing are marked Test Required on MSBOC's list — commercial PLUMBING and RESIDENTIAL PLUMBING — so plan on a trade exam for either.

One boundary worth knowing before you buy a NASCLA study plan: MSBOC accepts NASCLA exams only for commercial general building and master electrical — not for mechanical, HVAC or plumbing — so the NASCLA route does not replace the plumbing trade exam in Mississippi.

Ask MSBOC which trade exam maps to your classification when you apply.

Insurance, not a bond, is the requirement our research confirms.

Commercial applicants must show general liability coverage of at least $300,000 per occurrence or $600,000 aggregate; for residential applicants MSBOC's page states no minimum coverage amount — just proof of coverage.

The same board page notes workers' compensation proof for applicants with 5 or more employees.

A bond is the open part: what we read sets no bond amount for plumbing contractors, so ask MSBOC whether your classification or a specific project carries a bonding requirement.

The financial statement commercial applicants need sits with the fees, under cost below.

The application fee is $400 for a commercial license and $50 for a residential one.

Commercial applicants also need a CPA-reviewed financial statement showing net worth of at least $50,000 for a major classification or $20,000 for a specialty, plus the insurance above.

Once issued, the license runs on a short clock: residential licenses and commercial certificates of responsibility must be renewed every 12 months, a late renewal is possible up to 180 days after expiry, and after that a new application is required.

Our research captured the application fees but no renewal fee amount, so price the annual renewal with MSBOC.

Continuing education reaches the residential side only: each qualifying party for a residential license must complete 2 hours of continuing education from a board-approved provider (Miss.

Code Ann. §73-59-11) — the pages we read do not state whether that is annual or per renewal — and no CE requirement was found for commercial licenses.

Yes, but MSBOC's reciprocity waives trade exams only — no entry transfers a license.

Plumbing is the case the page itself flags: the Tennessee entry says its agreement waives all exams, and MSBOC's own line — quoted below — calls Tennessee the only state that waives Mechanical and Plumbing.

Yet the same page's Ohio entry covers electrical, HVAC, plumbing and/or refrigeration, which does not square with that quoted line — a tension on MSBOC's page that our research cannot settle, so confirm with the Board how your state's entry is applied before you count on a waiver.

The other entries our research captured are HVAC-side: Alabama, through the general contractor board, and Louisiana, whose exam scores can waive the HVAC exam.

And whichever waiver applies, the Mississippi Business and Law exam is always required.

Move fast: the Board must be notified and a replacement qualifying party made within 90 days of the disassociation.

Failure to replace the qualifier within that window results in a hearing notice — a show-cause hearing — and the departing qualifier's classification is removed from the license unless it is replaced.

For a shop whose only classification is the Plumbing specialty, that removal leaves the license without the classification it trades on.

Because a company may have different qualifiers for different classifications, losing one qualifier does not necessarily strip every classification at once.

MSBOC's qualifying-party page carries a $25 change-of-qualifier fee.

And note the clock's start: the 90 days runs from the date of disassociation, not from when you start looking, so if your qualifier gives notice, begin the replacement search immediately — and line up a residential replacement who can complete the 2-hour continuing-education requirement that applies to residential qualifying parties.