Do I need a permit to replace a water heater? The rule in 12 cities, and how many get filed

The rule in 8 cities, with their permit counts

Each rule is from the city's own page, read 22 October 2026. The counts are water heater permits in that city's permit file over three years to September 2026; "usual days" is the typical time from issue to final inspection.

Four more cities whose rules we read require one too, though their permit files do not split water heaters out: Columbus lists "Replace a hot water tank" as needing a permit but no plan review; the City of San Diego says "Replacing water heaters" requires a permit; Denver puts water heaters on its same-day quick-permit list; and Naperville requires one for "New water heaters (including a change in power source unit)".

San Diego County's 1,253 permits, despite its exemption, are the swaps that changed something: a tankless conversion, a gas-to-electric switch, a move. That is the general pattern. The exemptions are written for an identical unit in the same spot; once the fuel, size or location changes, every city on this list wants a permit.

What happens if you skip it

• Palo Alto: when work starts before the permit, "an additional penalty fee equal to the amount of the permit fee shall be assessed".
• Colorado Springs area (Pikes Peak Regional): a stop work order stays until the permit is pulled, and a "Certificate of Alleged Non-compliance" is filed with the county Clerk and Recorder against the property. The record owner pays any extra fees.
• Seattle: the building department says it may fine work done without a permit "up to $500 per day".

Buyers can search your address too. Our permit vs no permit guide covers seller disclosure forms.

Who pulls it

The plumber or HVAC company installing it, in its own name, in nearly every case. San Diego County's exemption only applies to work by a licensed contractor. Owners can pull their own in some places: Cary lets owners do their own plumbing if the house stays their primary residence for 12 months after the work, and Pikes Peak Regional issues homeowner permits only for your own primary residence and only when you do the work. It says it is "illegal for a homeowner to obtain a permit for a contractor hired to do the work for you". Our owner-builder guide covers the trade-off.

How long it takes

Small. The usual water heater permit reached its final inspection in 16 days in Cary and 23 in Elk Grove; Bellevue's took 32. Not all of them close: only 71.7% of Sacramento County's water heater permits that are a year or more old reached a final, and 66.8% in Bellevue. An unfinaled permit stays open on your address, so ask the plumber when the inspection is booked. Our open permit guide explains how to close one.

Check it in five minutes

1. Search your city's site for "work exempt from permit" and look for water heaters, or call the permit counter.
2. Ask the plumber: "Is the permit in this price, and whose name goes on it?"
3. After the install, search your address on the city's permit portal and look for the final. Our did my contractor pull a permit guide links each city's search.

If you are still deciding whether to replace it, see repair vs replace and tank vs tankless. For other common jobs, our do I need a permit overview covers 13 projects.

See who files water heater permits in Sacramento County →

What this does not tell you

We read 12 departments' rules out of more than 50 cities in our data, and the Palo Alto and Anaheim handouts date from 2015 and 2014; check the current page before relying on them. Our counts show permitted installs only. A swap done without a permit leaves no record, so we cannot say how many there are.