Plumbing and HVAC rules in South Carolina
What the state says about plumbing and heating and cooling work, with the page each rule comes from. It's a summary of the published rules, not legal advice, and your city or county can have rules of its own.
Checked September 23, 2026
Plumbing licensing
In South Carolina, commercial plumbing over $10,000 needs a mechanical contractor license with the plumbing classification from the Contractor's Licensing Board. Residential plumbing over $500 needs a residential specialty license from the Residential Builders Commission.1, 2, 3
Heating and cooling licensing
South Carolina's Contractor's Licensing Board licenses mechanical contractors in classifications that include Air Conditioning, Heating, Packaged Equipment and Refrigeration.1
Plumbing and mechanical codes
South Carolina uses the 2021 International Plumbing Code with state modifications, and local enforcement is mandatory.4 South Carolina uses the 2021 International Mechanical Code with state modifications too.4
Permits to replace a water heater, furnace or AC
Ask your local building department whether replacing a water heater, furnace or AC needs a permit where you live.
Backflow testing
If your home has a backflow preventer, your water utility can tell you whether it needs testing and who can test it.
Sources
What plumbing and HVAC work costs in South Carolina
Published national ranges for plumbing, water heater, sewer, AC, heat pump and furnace jobs, and a planning estimate for your own job.
Contractors in South Carolina
169 plumbers and heating and cooling contractors are listed in South Carolina. 106 hold an active USDOT registration. Browse them by county, or ask for quotes and we'll pass your job to contractors near you.
Cite this page
“Plumbing and HVAC rules in South Carolina.” PlumbingInformationSite.com, updated September 27, 2026. https://plumbinginformationsite.com/sc/rules/