Do you need a permit to replace a water heater in Colorado?

Do you need a permit to replace a water heater in Colorado?

Yes. The State Plumbing Board confirmed on Oct 6, 2026 that replacing a water heater needs a licensed plumber and a permit. That includes like-for-like swaps.

Who can pull the permit?

A master plumber who is also a registered plumbing contractor, a master plumber who works for a registered contractor, or a homeowner doing work on their own home.

Can a homeowner replace their own water heater?

Yes, on their own home. Homeowners can do their own plumbing without a license, but not on a home built or remodeled for sale, on a rental, or on a commercial building. They still need the permit and inspection.

What if I start before I have the permit?

Under the state plumbing rules, starting work before buying the permit means paying double the permit fee.

What does the inspector look at on a water heater?

In general terms: the relief valve and where its discharge goes, a drain pan where a leak could cause damage, thermal expansion control when the system is closed, and the gas connection and venting. Colorado’s state rules change part of the water heater chapter. For example, a replacement heater doesn’t need a pan if no pan was required when the old one went in.

Since Jan 1, 2026, new gas water heaters installed in Colorado must meet the state’s low-NOx limits, with a temporary exemption for propane units and manufactured homes until Jan 1, 2031.

Which cities have their own water heater rules?

9 jurisdictions in the app add local water heater rules.

How do I explain the permit to a homeowner?

Tell them the permit is required by state law and the city checks the install for safety. Then show them the city’s rule on your phone. See Sell with Code.