South Carolina HVAC License — Two Boards, Two Tracks, One Roadmap

There Is No Single "South Carolina HVAC License"

Most states hand you one licensing board and one application. South Carolina hands you two boards, two sets of rules, and two completely different application pipelines — and figuring out which one applies to your situation is the first compliance decision you have to get right.

The South Carolina Department of Labor, Licensing and Regulation (LLR) splits HVAC oversight between the Contractor's Licensing Board (CLB) for commercial and industrial work, and the Residential Builders Commission (RBC) for residential work. Each board has its own application forms, its own exam requirements, its own financial thresholds, and its own renewal calendar. Filing with the wrong board wastes your application fee and months of processing time.

The dividing line comes down to two questions: what type of property is the work on, and how much is the project worth?

Residential Track: The RBH License

If you plan to install, repair, or replace HVAC systems in residential structures — defined as buildings three stories or fewer with sixteen or fewer units — you need the Residential Specialty HVAC Installer and Repairer (RBH) license from the RBC.

The licensing trigger is low: any residential HVAC project where total cost (labor plus materials) exceeds $500 requires this license. That threshold catches virtually every equipment change-out, split-system retrofit, and comprehensive duct modification.

Key requirements for the RBH license:

• Experience: One year of hands-on residential HVAC work within the past five years, verified by a licensed builder or HVAC contractor through an experience affidavit
• Exams: Pass both the Residential HVAC Trade exam (80 questions, 240 minutes, 65% to pass) and the Residential Business Management and Law exam (50 questions, 120 minutes, 68% to pass) through PSI
• Credit report: A complete personal credit report dated within 30 days of your application — the RBC reviews for unresolved construction judgments and liens, not a minimum score
• Surety bond: A flat $10,000 bond if any project exceeds $5,000, issued in your personal legal name (not your business entity name)
• Application fee: $135, plus a $220 license fee after approval and exams

One critical procedural difference on the residential side: the RBC must approve your experience credentials before you can register for the PSI exams. You cannot schedule your test first and sort the paperwork later.

Commercial Track: The Mechanical Contractor License

For commercial, industrial, and institutional HVAC work — or work on a structure exceeding three stories or sixteen units — the CLB is the relevant board. A Mechanical Contractor license is required when the total cost exceeds $10,000 (raised from $5,000 by a 2023 statutory amendment).

The commercial track licenses the contractor applicant, usually a business entity. Every licensed firm must designate a Primary Qualifying Party (PQP) — the individual who carries the technical credentials and takes legal responsibility for the company's trade work.

The CLB divides commercial licenses into five financial groups that cap your maximum single-project value:

• Group 1: Up to $35,000 per project ($7,000 net worth or bond)
• Group 2: Up to $100,000 ($15,000 net worth or bond)
• Group 3: Up to $200,000 ($30,000 net worth or bond)
• Group 4: Up to $400,000 ($60,000 net worth or bond)
• Group 5: Unlimited ($300,000 net worth or bond)

For Groups 1 and 2, you can submit an owner-prepared financial statement. Groups 3 through 5 require CPA-prepared statements — but every group offers a 1:1 surety bond alternative that bypasses the CPA requirement entirely.

PQP requirements include two years of commercial experience in the past five years, passing the commercial trade and Business Management and Law exams through PSI (70% to pass on both), and a $350 initial application fee.

Unlike the residential track, the CLB does not require pre-approval before you schedule your exams. You take the tests first, then submit your application package with the passing score sheets.

The EPA 608 Card Is Not a License

A common and expensive misconception: your federal EPA Section 608 certification does not authorize you to contract, pull permits, or advertise HVAC services in South Carolina. The EPA card is an environmental safety credential for refrigerant handling — mandatory for covered refrigerant-handling work, subject to federal exceptions such as closely supervised apprentices, but it carries zero contracting authority under state law.

Performing residential HVAC work over $500 or commercial work over $10,000 without the appropriate state license constitutes unlicensed contracting and may lead to misdemeanor prosecution. Separate LLR administrative penalties for unlicensed commercial contracting can be up to $500 for a first violation and up to $1,000 for a second, with subsequent offenses referred to the full board; unlicensed contractors may also be unable to enforce contracts or file mechanic's liens.

Where Local Permits Fit In

A state license establishes your competency to work statewide, but it does not replace local permitting. Before starting any new installation, major replacement, or duct modification, you need a permit from the county or municipal building department. Local inspectors will verify your active state license before issuing a mechanical permit, and they enforce rough-in and final inspections under the South Carolina Mechanical Code.

Permit structures vary by locality — Greenville County charges a $72 minimum mechanical permit fee, while Charleston County uses a valuation-based schedule starting at $50.

Mapping Your Path

The right track depends on your intended scope of work. Residential-only contractors follow the RBC path. Commercial contractors follow the CLB path. If you want to work both sides, you need both licenses — there is no combined credential.

For a step-by-step breakdown of each track's application sequence, financial documentation, and filing timelines, the South Carolina HVAC License Guide walks through the complete dual-board process from experience verification through your first municipal permit.

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