HVAC Contractor License in South Carolina: Requirements, Qualifier, Bond and Exams

Yes — statewide.

Which license a shop needs follows the work: residential HVAC work over $500 requires a license from the Residential Builders Commission (RBC), and commercial HVAC work over $10,000 requires a Contractor's Licensing Board (CLB) mechanical contractor license.

The state credentials our research confirmed are business and contractor licenses — we found no state license for employed HVAC technicians — so what an individual technician needs is its own topic, not this one.

Local jurisdictions may still examine and license residential specialty contractors, but they may not require another exam from a contractor who already passed a Commission-approved exam in that trade.

Two boards split the work.

The Contractor's Licensing Board issues the mechanical contractor license, whose subclassifications include Air Conditioning (AC, which includes Packaged Equipment and Refrigeration), Heating (HT, hot water and steam systems including boilers and related gas lines), Packaged Equipment (PK, limited to 25 tons cooling and 500,000 BTU/hr heating per unit) and Plumbing (PB).

The mechanical contractor license also comes in groups that limit the jobs you can take: Group 1 caps a job at $35,000; Group 2 at $100,000; Group 3 at $200,000; Group 4 at $400,000; and Group 5 is unlimited.

The Residential Builders Commission issues the Residential HVAC Installer and Repairer license on the residential side.

Mechanical contractors in the AC, heating or packaged-equipment subclassifications must also display the license at their principal place of business and show the license number on commercial vehicles, invoices and proposals.

The qualifier is the Primary Qualifying Party (PQP), and a CLB license requires one for each classification on the license.

The PQP needs at least 2 years of full-time work experience in the requested license classification or subclassification, performed within the past 5 years, plus the exams in the next section.

The slot is exclusive: an individual may serve as qualifying party for only one licensee, unless two entities share the same physical location and the qualifying party works in both daily, earns a livelihood from both and owns at least 50% of one of them.

That exclusivity makes the qualifier decision a structural one for the business.

HVACHires keeps a separate guide to the HVAC contractor license qualifier.

Two layers.

The qualifying party passes the PSI technical exam for the classification where one is required, plus the PSI S.C. Business Management and Law for Commercial Contractors exam with a score of 70%.

The technical exam can be waived for an applicant licensed in a state with an exam-waiver agreement with the board.

On the residential side, the RBC waives its technical exam for a South Carolina mechanical contractor who has held the AC or PK subclassification by exam for 1 or more years, for licensees from Alabama, Mississippi or North Carolina held by exam for 1 or more years, and for holders of a current HARV (Master Mechanical) certification — but the business law exam is still required in every case.

The HARV certification itself changed issuers: the Municipal Association of South Carolina issued it through December 2025, and Carolinas AGC has issued it since January 1, 2026.

The CLB's financial requirement scales with your group.

Each group sets a required net worth or working capital, from $7,000 or $3,500 for Group 1 up to $300,000 or $200,000 for Group 5, and instead of a financial statement the business may post a surety bond equal to its group's net worth: $7,000 (Group 1), $15,000 (Group 2), $30,000 (Group 3), $60,000 (Group 4) or $300,000 (Group 5).

On the residential side, a residential specialty contractor whose job for an individual property owner exceeds $5,000 must obtain an executed bond with a surety in an amount approved by the Commission; the sources we read did not state that amount.

Our research did not confirm a separate insurance requirement for either license, so ask the board what it currently requires before you bind coverage.

HVACHires keeps a separate guide to the HVAC contractor bond and insurance.

The CLB mechanical contractor license costs $350 initially.

Mechanical contractor licenses expire October 31 of odd-numbered years and renew biennially for $135, with late fees of $100 to $200 added.

The residential side has its own fee table: the RBC residential HVAC license costs $220, renews for $220, carries a $50 late fee and a $480 reinstatement fee, and a license lapsed more than three years requires re-examination as a new applicant.

On the renewal cycle, chapter 59's text says the Commission shall annually renew all licenses, but we did not confirm the RBC's renewal cycle for the residential HVAC license on the RBC's renewal page, so confirm the cycle with the Commission.

Our research found exam-waiver routes rather than a named reciprocity programme.

The CLB may grant a license to an applicant who holds a license or certificate in good standing in another state whose requirements are equal to or greater than South Carolina's, and it may waive the technical exam for applicants licensed in states with an exam-waiver agreement.

Ohio lists South Carolina as a reciprocity state for HVAC and plumbing, with the business-and-law exam still required — that is Ohio's listing, and the CLB's own agreement list was not among the pages we read, so confirm your state's standing with the board.

On the residential side, the RBC waives its technical exam for licensees from Alabama, Mississippi or North Carolina held by exam for 1 or more years.

South Carolina gives you a defined runway.

When the primary qualifying party disassociates, the licensee or the PQP must notify the department in writing within 15 days of the disassociation.

The license stays in good standing for 90 days, and it is suspended if no replacement qualifying party is designated within that window.

Because a qualifying party can back only one licensee — the two-entities-at-one-location exception above is the only way around that — a successor who already holds a slot elsewhere can serve only if the exception applies; the practical move is to know which employee or which hire can qualify, 2 years within the past 5 plus the exams, before the 90 days run out.

The two licenses split by job value, and the split matters before you bid.

Residential HVAC work over $500 requires the RBC Residential HVAC Installer and Repairer license; commercial HVAC work over $10,000 requires the CLB mechanical contractor license.

The commercial threshold changed by statute: 2023 Act No. 69 raised it from $5,000 to $10,000, effective May 19, 2023, so checklists quoting $5,000 are out of date.

One shortcut applies on the residential side: a South Carolina residential builder who was licensed by examination may perform residential specialty work, including HVAC, without a separate specialty license.

Separately, a licensed residential specialty contractor may hold no more than three classifications.