HVAC permit requirements in South Carolina

South Carolina takes the guesswork out of the permit question: yes, a permit is required, everywhere in the state. The SC Building Codes Council, operating under LLR, adopted the 2021 I-Codes - including the International Mechanical Code with South Carolina modifications - effective January 1, 2023, and state law makes those codes mandatory statewide. Every county and municipality must enforce them, so an HVAC changeout requires a mechanical permit no matter which town you live in. What varies is administration and price, which stay local.

Fees for a typical changeout run roughly $40-$150 depending on jurisdiction. Greenville County charges a $72 minimum plus $36 per appliance for a residential mechanical permit, while some jurisdictions use valuation-based schedules instead of flat fees. Call your local building department for the exact number before work starts.

Who can pull the permit? Normally an LLR-licensed Mechanical Contractor or a Residential Specialty Contractor with the HVAC classification. Licensing runs through LLR, the same agency that houses the Building Codes Council, so contractor verification is a single-stop lookup.

Homeowners have a carve-out, but it is narrow. Under S.C. Code 40-59-260, an owner-occupant may pull their own permit - with strings attached. You must appear personally at the permit office and sign for it, and the exemption applies only to a home you occupy yourself. Sell or rent the property within two years and the statute treats that as prima facie evidence the exemption was abused. In practice: if this is your primary residence and you are staying put, the owner exemption is available; if you are flipping or renting, hire a licensed contractor and let them pull it.