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

  1. South Carolina Legislature ↑
  2. South Carolina Department of Labor, Licensing and Regulation ↑
  3. South Carolina Department of Labor, Licensing and Regulation ↑
  4. South Carolina Department of Labor, Licensing and Regulation ↑

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.

Plumbing, heating and cooling costs in South Carolina

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/