Plumbing and HVAC rules in Mississippi

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

The Mississippi State Board of Contractors licenses plumbing as a classification, for commercial jobs over $50,000 and for residential plumbing subcontractors under its RP classification. Many cities also license plumbers.^{1, 2, 3}

Heating and cooling licensing

HVAC is a specialty classification with the Mississippi State Board of Contractors, with a test required, and it also falls under the board's Mechanical classification.¹

Plumbing and mechanical codes

Your local building department can tell you which plumbing and mechanical codes apply where you live.

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 Mississippi

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 Mississippi

Contractors in Mississippi

58 plumbers and heating and cooling contractors are listed in Mississippi. 30 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 Mississippi.” PlumbingInformationSite.com, updated September 27, 2026. https://plumbinginformationsite.com/ms/rules/