Several Valley cities exempt some like-for-like water-heater replacements, often only by a licensed contractor. Scottsdale lists replacement as permit work. Changes to fuel, location, rating or connections can change the answer. Confirm the exact job with the property's City or unincorporated County jurisdiction.
Which cities require a permit for a replacement?
“Like for like” is a local exemption term. Do not assume that a similar tank size alone meets it. Have the old and new fuel, model, capacity, input rating, location and connection details ready.
| Jurisdiction | Published replacement guidance | Conditions or next step | Official source |
|---|---|---|---|
| Phoenix | Exempt for a licensed contractor's replacement in a house or duplex | The City lists this narrow exemption. Confirm changes to type, fuel, location or the scope of work. | Phoenix exempt work handout, Phoenix PDD page |
| Mesa | Exempt for residential like-for-like gas or electric replacements of equal or lesser rating | The City requires a permit for storage-gas to tankless-gas conversion and notification to the gas utility before gas appliances enter service. | Mesa code, Mesa FAQ |
| Chandler | The homeowner manual exempts like-for-like residential replacement | Confirm the current definition and whether changes to fuel, rating, location or system design need a permit. | Chandler code, Chandler manual |
| Gilbert | Confirm with Building Safety | Ask whether a licensed-contractor exemption covers this exact replacement and how tankless, rating or connection changes are treated. | Gilbert technical codes |
| Scottsdale | Yes: the City lists water-heater replacement for a minimum plumbing permit | The single-family handout says a homeowner or licensed contractor may obtain the permit. | Scottsdale handout, Scottsdale home improvement page |
| Tempe | Confirm the applicable replacement exemption with Building Safety | Ask specifically about the same type, fuel and location and any changes to the connections. | Tempe code |
| Glendale | Exempt when a licensed contractor installs it, residential only | The City Q and A gives that exemption; confirm homeowner work and changes beyond replacement. | Glendale Q and A |
| Peoria | Exempt for in-kind replacement by a licensed contractor in a house or duplex | Confirm work outside that stated exemption before starting. | Peoria code, Peoria permits page |
| Surprise | Residential exemption: same size, type and operation, previously permitted | The published amendments separately limit commercial gas/electric exemptions by licensed installer, rating and unchanged connections. Confirm the code applicable to the building. | Surprise amendments |
| Goodyear | Gas/electric exemption for a licensed contractor, equal or lesser rating and unchanged connections | The published amendments distinguish BTU/CFH for gas and amperage for electric. Changes outside those terms need review. | Goodyear code, Goodyear FAQ |
| Avondale | Confirm with Building Safety before relying on an exemption | The cited adopted-code document does not identify a specific water-heater replacement exemption. Ask the City to confirm the applicable permit requirement. | Avondale code adoption |
| Buckeye | Confirm with the Permit Center | Ask about the exact replacement, fuel changes and whether a simple permit applies; a fee listing alone does not establish every exemption. | Buckeye Permit Center, Buckeye fee schedule |
| Queen Creek | Confirm with Building Safety | Ask the Town to reconcile its published replacement exemptions with its required-permits guidance for this job. | Queen Creek amendments, Queen Creek permit page |
| Fountain Hills | Confirm with Building Safety | Ask whether this residential replacement is exempt and what changes would require a permit. | Fountain Hills Building Safety |
| Paradise Valley | Confirm the like-for-like replacement rule with the Town | The Town lists water-heater installation as plumbing permit work, but that listing alone does not settle every replacement exemption. | Paradise Valley permits page |
| Unincorporated Maricopa County | Current permit page says replacement is exempt when manufacturer specifications are followed | An older addenda document limits its exemption to licensed-contractor tank replacements and excludes on-demand units. Confirm tankless, altered work or conflicting guidance with the County. | County permit page, County local additions |
These rows concern the stated residential exemptions unless commercial conditions are identified. The approved plans and local authority control the actual job. An exemption skips a permit requirement for that scope; it does not waive installation code or equipment instructions.
For more detail, see Phoenix water-heater permits, Mesa's replacement permit guidance, Chandler's guidance, and unincorporated County rules.
What changes should you ask about?
- Tank to tankless. Mesa specifically requires a permit for storage-gas to tankless-gas conversion. Other jurisdictions need to evaluate their own exemption and any changed gas, vent or electrical requirements. See Mesa's tank-to-tankless rules.
- Fuel or location changes. A new gas line, circuit, vent arrangement or piping layout can involve work outside a replacement exemption.
- Higher input rating. Mesa and Goodyear expressly limit the replacement rating in their published guidance. Supply sizing and equipment instructions still matter wherever the work is exempt.
- Who installs it. Phoenix, Glendale, Peoria and Goodyear include licensed-contractor conditions. Do not apply those exemptions to a homeowner installation without confirmation.
- Building type. A residential exception does not establish the answer for a restaurant, apartment project or other commercial building.
Can a homeowner replace a heater without a permit?
It depends on the local exemption. Phoenix's residential permit page identifies DIY electric replacements as permit work and distinguishes licensed-contractor replacements. Scottsdale's handout allows the homeowner or a licensed contractor to obtain the replacement permit. The City of Mesa writes its stated residential exemption around a like-for-like gas or electric model of equal or lesser rating. Check the exact scope with the jurisdiction rather than assuming one City's rule applies elsewhere.
Read whether you can install a water heater yourself in Arizona, and have a qualified professional evaluate gas connections, combustion air, venting, relief piping and electrical work.
How do you resolve the permit question before buying?
- 1Identify the property's City or unincorporated County jurisdiction.
- 2Give Building Safety the old and proposed model, fuel, rating, location and planned connection changes.
- 3Ask whether the exact work is exempt and whether the installer's license affects that answer.
- 4Obtain the required permit and follow the jurisdiction's inspection procedure when one applies.
- 5Keep the official response, permit and installation records with the equipment paperwork.
HQ Plumbing & Air replaces water heaters across the Valley, with free estimates, upfront pricing and licensed, insured plumbers. Discuss the applicable installation and inspection requirements before the work starts.