Do You Need a Permit to Replace a Water Heater in Arizona?

The Short Answer for Arizona

Permit rules differ from city to city, so check with your local building department before starting work. Scottsdale, Peoria, Queen Creek, Tucson and Prescott say permit required. The rest turn on who does the work, what you install, or whether anything changes.

The city building department has the final word, and rules change.

City-by-City Rules

Cities Where a Permit Is Required

• Scottsdale: a minimum plumbing permit, listed for gas or electric water heater replacement.^[3] The homeowner or a licensed contractor may obtain it, and the property owner remains responsible for making sure the permit and inspection are completed.^[14]
• Peoria: the city says a homeowner replacing a water heater needs a permit through its Development and Engineering Department.^[5]
• Queen Creek: "Water heater installations" appear on the town's list of required permits.^[7]
• Tucson: replacing a tank-style water heater with the same type and size requires a permit and inspection.^[9]
• Prescott: the city's 2026 chart marks water heater replacement YES for the residential and commercial building permit columns.^[11]

Cities Where It Depends

• Phoenix: a homeowner doing their own electric water heater replacement needs a permit. None is needed if a licensed contractor does it.^[1] The city's exemption list adds that the contractor must verify the certification mark and follow the manufacturer's instructions.^[13]
• Mesa: no permit for a like-for-like gas or electric replacement of equal or lesser rating. A permit is required to swap a storage gas heater for a tankless or on-demand gas unit.^[2]
• Glendale: no permit if a licensed contractor installs it (residential only). The page does not say what applies when the owner does it.^[4]
• Goodyear: no permit for a like-for-like residential replacement installed by a contractor. Other changes are not addressed.^[6]
• San Tan Valley (Pinal County): replacing an electric or gas heater with the same type, size and location "may be permit exempt." Otherwise a permit is required.^[8]
• Yuma: no permit to replace an existing electric water heater in the same location, whether a licensed contractor or the owner/occupant does it. The exemption does not cover gas heaters.^[10]
• Lake Havasu City: no permit only if the heater stays in the same location, does not increase ampacity, and is not converted to fuel gas.^[12]

Check the city's fee schedule for the fee.

Conditions That Change the Answer

Advice online conflicts because the conditions differ by city.

Fuel type matters in Yuma, where the exemption covers electric only.^[10] Converting to gas takes a heater out of Lake Havasu City's exemption.^[12] Mesa's trigger is going from a storage gas heater to tankless gas.^[2]

Location and size matter in San Tan Valley and Lake Havasu City, where a move or a capacity increase ends the exemption.^[8][12]

Who does the work matters in Phoenix, Glendale and Goodyear, where the no-permit answer is tied to a licensed contractor.^[1][4][6]

Decide

Phoenix electric replacement

?Who does the work?

• If Homeowner

  then: Permit needed

• If Licensed contractor

  then: No permit needed

Who Pulls the Permit

Where a permit applies, the installer usually handles it, but ask. Request in writing whether the price covers the permit, inspection scheduling, any correction work and permit closure.

Verify any plumber before hiring with the Arizona contractor license check. Our plumbing guide covers the license classes. If you need a pro in the Phoenix area, 602plumbingpros.com is our sister directory.

Cities to Check Locally

For Chandler, Gilbert, Tempe, Surprise, Avondale, Buckeye, Maricopa and Flagstaff, check with the city. Chandler's homeowner permit manual, the Maricopa FAQ and Flagstaff's permit guide are the places to start.

Flagstaff's over-the-counter schedule also has a "Water Heater w/vent" category.^[16]

Camp Verde lists hot-water-heater installations among minor plumbing projects eligible for an over-the-counter permit.^[15]

Skipping a Permit and What Comes Next

An unpermitted replacement can surface through insurance claims, a home sale or a later inspection.

Before work starts, call the city and confirm the rule for your exact swap.

If a permit applies, get it before installation and schedule the final inspection afterward. Then keep the permit, inspection approval, invoice, model information and installation photos.

See Arizona permit rules by city and job for other jobs, and work that does not need a permit for the wider picture.

Quick answers

Do I need a permit to replace a water heater in Arizona?

It depends on the city. Scottsdale, Peoria, Queen Creek, Tucson and Prescott say a permit is required. Other cities turn on who does the work, what you install, or whether anything changes.

Does a licensed contractor need a permit in Phoenix?

Phoenix says none is needed for an electric replacement when a licensed contractor does it. A homeowner doing their own electric replacement needs a permit.

Can switching to a gas or tankless heater trigger a permit?

Yes in some cities. Mesa requires a permit to swap a storage gas heater for a tankless gas unit, and converting to gas ends Lake Havasu City's exemption.