Can your HVAC or plumbing company work in another state? Contractor licence reciprocity

True reciprocity between contractor boards is scarce, and the agreements that exist are narrower than the word suggests.

The pattern our research verified across state boards is that most HVAC and plumbing "reciprocity" is a trade-exam waiver, not a licence swap: Tennessee, Mississippi, California and North Carolina waive only the trade exam and still require their own business-and-law exam or application from the incoming contractor.

Your company does not arrive licensed — it applies, and the agreement only shortens the exam queue.

The clearest contractor-level cluster sits around Ohio.

The Ohio Construction Industry Licensing Board (OCILB) has HVAC reciprocity with Alabama, Kentucky, Louisiana, Mississippi, South Carolina, Tennessee and West Virginia, and Alabama, Mississippi and Tennessee list Ohio among their own HVAC exam-waiver and reciprocity partners.

On the plumbing side, OCILB's agreements cover Arkansas, Mississippi, South Carolina, Tennessee and West Virginia.

Other boards the research verified run by their own rules.

Louisiana's State Licensing Board for Contractors has, since October 23, 2024, accepted a trade exam passed in any other state for an equivalent Louisiana classification — with no waivers, exemptions or grandfathering — replacing its earlier state-by-state agreements; all other Louisiana licensing requirements still apply.

The Texas Department of Licensing and Regulation reviews out-of-state and municipal licence holders case by case and may require some or all Texas requirements, including the exam, while pointing South Carolina and Georgia licensees to specific agreements.

The counter-list matters just as much for expansion planning — read each entry at the level it names, worker or contractor: states reporting no licence reciprocity at all for the trade include Hawaii (plumbers), Indiana (plumbers), North Carolina (plumbing, heating and refrigeration), Arkansas (HVACR), Florida (AC, mechanical and plumbing contractors) and New Mexico (journeymen).

Where an entry covers your company's own licence, that board reports no reciprocity shortcut — ask it what routes it does offer before you budget the move.

Treat any single board's reciprocity claim as one side of the record until the partner board confirms it.

North Dakota says it has a written plumbing agreement with Minnesota, but Minnesota's own pages show no licence-for-licence reciprocity — out-of-state licensees may only sit the exam.

Oklahoma's Construction Industries Board reports a 2024 plumbing agreement with Arkansas that Arkansas's plumbing pages do not mention, and Louisiana lists Texas as a journeyman reciprocity partner while the research found no matching agreement on the Texas plumbing board's side.

Before your company schedules work in the partner state, get the second board's confirmation of the agreement and what it waives.

Where the state does not licence the trade at all, reciprocity can run city to city.

Indianapolis states that HVAC licensing in Indiana is at the discretion of the local municipality, and its Board of Heating and Cooling Examiners grants reciprocal heating and cooling licences only for a current licence from another municipality or agency that was earned on a Prometric or Prov exam verified as equivalent to Indianapolis's exam, with a minimum score of 70%.

That is how specific a reciprocity can be — verified exam vendor, verified score, one municipality at a time.

One place boards do report reciprocity is the worker level, not the company level: journeyman-plumber agreements in the Northwest and Plains, as each board lists them.

Montana lists Oregon, Idaho, North Dakota and South Dakota; Oregon lists Idaho and Montana; Washington lists Idaho only; and North Dakota lists South Dakota, Minnesota and Montana.

That is the tech's licence, not the business's — our journeyman plumber licence guide covers that side.

For the company licence, the baseline is the second state's own contractor-licence rules: our HVAC contractor license and plumbing contractor license guides cover what each state requires of the business before reciprocity even enters the picture.

Verify before you bid: reciprocity lists and exam-waiver agreements change, and boards such as Texas's review out-of-state licence holders case by case.

The agreements named on this page are the versions the boards published when our research checked them.

Confirm the current agreement — and whether it covers your classification — with the second state's board before you contract there.

NASCLA runs an accredited exam for commercial general building contractors, plus electrical exams.

Participating agencies include Alabama, Arizona, Arkansas, California's CSLB, Florida, Georgia, Louisiana, Mississippi, Nevada, New Mexico, North Carolina, Oregon, South Carolina, Tennessee, Utah, Virginia, West Virginia and the USVI.

For a general building contractor, one exam can serve several of those agencies — but NASCLA acceptance is exam acceptance for general building (and electrical) classifications, not licence reciprocity, and scope varies within each state as each agency applies it.

For the two trades this site covers, the limit is blunt: the NASCLA exam does not replace HVAC or plumbing trade exams in the states our research checked.

Arizona, Louisiana, Nevada and New Mexico accept it only for general building (and electrical) classifications.

There is no NASCLA plumbing exam in use yet — the association is only now developing one.

And Tennessee accepts the NASCLA National Commercial exam for its commercial classifications.

The working takeaway for a mechanical or plumbing contractor: plan on sitting the second state's own trade exam.

The NASCLA exam earns its keep where the company also pursues a commercial general building classification.

It is not a mechanical or plumbing shortcut.

Whatever the agreement waives, the second state licences your business — it does not upgrade your home-state licence.

That makes the qualifier, the person whose own licence the company trades on, the state's leverage point, and titles vary by state: California uses RMO or RME, Florida and Tennessee say qualifying agent, Arizona, Louisiana, Mississippi and New Mexico say qualifying party, South Carolina says Primary Qualifying Party, Texas and Colorado say Responsible Master Plumber, and New Jersey says bona fide representative, among other state-specific titles.

Your qualifier in one state holds no qualifier status in the next until that state says so — our qualifying agent guide unpacks the role itself.

A waived trade exam does not waive the file.

The second state still takes its own application and, in the states our research verified, its own business-and-law exam, plus whatever bond and insurance the state requires of licensees — the trade-exam-waiver pattern again.

If the expansion plan is one qualifier serving two companies, check that state's rule first: one person may not qualify more than one company in Georgia, North Carolina, Ohio, Oklahoma (mechanical), Idaho (plumbing), Minnesota (plumbing) or Texas (ACR and RMP); Arizona, California, Nevada, New Mexico, Hawaii and Kentucky allow it only with common ownership (Arizona 25%, California 20%, Nevada 25%, New Mexico 30%, Hawaii 51%, Kentucky 25%); and Mississippi allows up to three companies while Florida allows it at board discretion.

If a qualifier leaves, the clocks run state by state, and a multi-state shop runs several at once.

North Carolina and Alabama's HACR board require contracting to stop immediately, and New Hampshire bars gas and plumbing work until a replacement is in place.

Oregon allows a temporary responsible managing individual for up to 14 days.

Nevada allows 30 days; Florida, Louisiana's LSLBC and Utah allow 60 days; California, Mississippi, South Carolina and Ohio allow 90 days; Tennessee allows 3 months; New Jersey HVACR allows 6 months.

Track the deadline for each state licence your qualifier supports, not just the home state's.

Indianapolis shows the full sequence a second authority can put in front of a reciprocal applicant.

The applicant documents at least five years of HVACR trade experience — or a mix of industry education and work — verified on employer letterhead.

After board approval, the contractor files proof of a surety bond, general liability insurance and workers' compensation coverage, with fees, before it is licensed.

And the board meets the second Monday of each month, with packets filed at least 10 business days ahead and the applicant appearing before the board.

Boards differ on steps and timelines, so build the calendar before the crew mobilises.

The qualifier is a person, which makes cross-state expansion a hiring project as much as a licensing one: whoever qualifies the company in the new state has to be recruited, verified and kept — and the company's licence depends on them, so know what happens when your qualifier leaves before the first job is booked.

Our guide to hiring HVAC and plumbing techs picks up from there.

This page is employer career and business information, not legal advice. Reciprocity, endorsement and qualifier rules are set by each state's licensing board — and by cities and counties where licensing is local. Confirm the current rules with the second state's board before you contract there.