Water Heater and Gas Line Permits in Phoenix and the Valley, by City
Whether a new water heater needs a permit depends entirely on which side of a city line your home sits. As of September 2026, Phoenix and Glendale do not require one when a licensed contractor does the work. Scottsdale and Peoria, next door, do. This page sets out what 14 Valley building departments say on their own websites about water heaters, gas lines and who can pull the permit.
5 of 14
building departments say in writing that a water heater replacement needs a permit. Buckeye's written rule covers tankless units
4
say no permit is needed when a licensed contractor replaces an existing unit: Phoenix, Glendale, Goodyear and Maricopa County
5
do not say either way on their websites, so a phone call is the only way to know
Every one
department that addresses gas piping requires a permit, an inspected pressure test, or both
Who actually issues the permit
Plumbing and gas permits in the Valley are issued by the city or town building department, or by Maricopa County Planning and Development for homes outside any city limit, which includes Sun City, Sun City West and part of Anthem. SRP and APS are electric utilities and do not issue or handle gas or plumbing permits. The natural gas utility here is Southwest Gas. It owns the service line and the meter. The piping from the meter into and through the house belongs to the homeowner, and that is the part the city permit and inspection cover. When a job needs the gas off at the meter, a larger meter or a relight, the contractor arranges that with Southwest Gas alongside the city permit.
The rules in each place, as of September 2026
No permit when a licensed contractor replaces an existing water heater in a one or two family home. A homeowner doing the work personally does need one. Source 1 Source 2
Permit required. Gas or electric water heater replacement needs a Minimum Plumbing Permit. No plan review is needed. Source
No permit when a licensed contractor replaces a water heater in a home. The city's permit questions page says so in plain words, for residential work only. Source
Permit required. The city names a homeowner replacing a water heater as a project that must be permitted. Source
The town's inspection list includes a water heater inspection (code 480), which points to permitted work, but no plain rule for a like for like replacement is stated. Call to confirm. Source 1 Source 2
Not stated on the official website. Call to confirm. Source
The town's building page states that all construction requires a permit. It does not mention water heater replacement by name. Call to confirm. Source
Our plumbers here
No permit. The county says permits are no longer required to replace an existing water heater when the work follows the manufacturer's specifications. You may still apply for one if you want a county inspection. Source
Not stated on the official website. Call to confirm. Source
No permit for a like for like residential replacement installed by a contractor. Source
Not stated on the official website. Call to confirm. Source
The city's tankless water heater checklist requires a building permit application, a plan showing the heater location and existing plumbing, and the specification sheet. A rule for a standard tank replacement is not stated. Source
Permit required to install or replace a water heater. The city also requires an expansion tank on every tank type water heater, a pan with a 1 inch drain where a pan is required, and a relief valve discharge pipe run outside or to an approved receptor. Source
Permit required. The fee schedule effective March 1, 2026 lists a water heater permit, new or replacement, gas, electric or tankless, at $50. Source 1 Source 2
Every entry was read on September 20, 2026 from the building department page or document linked beside it. Phone numbers appear only where we read one on the department's own page ourselves. For the rest, use the portal link. "Not stated" means the official site does not address the point in plain words. It does not mean no permit is needed. Rules change, exemptions have conditions, and a change of fuel, size, location or venting can turn an exempt replacement into permitted work anywhere. Homeowner associations may add their own requirements. This page is general information, not legal advice. Confirm with the department before work begins.
What a proper water heater replacement includes, permit or not
Temperature and pressure relief valve with a full size discharge pipe run to the outside or an approved drain, never capped and never reduced.
Thermal expansion control on any closed system, which means any home with a pressure reducing valve, check valve or backflow preventer on the supply.
A drain pan with a piped drain wherever a leak would cause damage, which includes every attic and interior closet installation.
Combustion air and correct venting on gas units, with required clearance from anything that burns.
A gas shutoff, a sediment trap and a listed connector on gas units, leak tested before the unit is lit.
Elevation or a sealed combustion unit for gas heaters in a garage, plus protection from vehicles.
An exemption from the permit is not an exemption from the code. Phoenix says as much: the licensed contractor is expected to verify the unit's certification mark, follow the manufacturer's instructions and comply with the applicable codes.
Questions about permits
As of September 2026, not if a licensed contractor does it. The City of Phoenix exempts replacement of an existing water heater in a one or two family home by a licensed contractor, and expects the contractor to install it to the manufacturer's instructions and the code. If you replace it yourself, you need a permit. Glendale and Goodyear have the same rule, and Maricopa County, which covers Sun City, Sun City West and other unincorporated areas, no longer requires a permit either. Scottsdale, Peoria, El Mirage and Litchfield Park all require a permit.
Neither. SRP and APS are electric utilities and have no role in gas line permits. Gas permits are issued by the building department of the city or town the home sits in, or by Maricopa County in unincorporated areas. The natural gas utility for the cities on this page is Southwest Gas, which owns the line up to and including the meter. Everything after the meter is the homeowner's piping and falls under the city permit. When work needs the gas shut off at the meter or the meter upsized, the contractor coordinates that with Southwest Gas.
The new or altered piping is filled with air and held under pressure on a gauge while the inspector watches for any drop. This happens before trenches are backfilled and before walls are closed, so the pipe is still visible. Phoenix requires a gauge that reads in tenths of a pound and the inspector verifies the result. Maricopa County says gas piping must in all cases be inspected and pressure tested. Cave Creek prints a minimum of 3 pounds per square inch for 10 minutes on propane lines.
The International Plumbing Code, which most Valley cities have adopted, requires a way to control thermal expansion wherever a check valve, backflow preventer or pressure reducing valve stops heated water from pushing back into the city main. Many Valley homes have a pressure reducing valve, which makes the system closed. El Mirage goes further and requires an expansion tank on every tank type water heater. On a closed system without one, pressure spikes every time the heater fires, which wears out relief valves, fill valves and the tank itself.
In many of these places, yes, if you own and live in the home and it is not a rental or for sale. As of September 2026, Glendale, Peoria, Paradise Valley, Goodyear, Buckeye, El Mirage and Maricopa County all say so in some form, usually with an owner builder form. That covers the permit, not the skill. Gas work in particular is not the place to learn.
Because their official websites do not say, in plain words, whether a like for like water heater replacement needs a permit. We only print what we could read on the building department's own pages. For those cities the table gives the department's phone number and permit portal so you can ask. We call before we start work in any of them.
For information purposes only. This page is a general guide compiled from public sources as of September 2026. It is not professional, legal, financial or engineering advice, and it is not a quote or a guarantee. Permit rules have conditions and exceptions. Always confirm with your building department before work begins. Figures, rules and programs change, and your own home, bill or project may differ. Confirm anything important with the source linked on this page or with the agency or utility concerned before you act on it. American Discount Plumbing accepts no liability for decisions made using this page.
Want it done right, with the paperwork handled?
American Discount Plumbing pulls the permit wherever one is required, meets the inspector, and installs to code everywhere, whether or not anyone is checking. Gas lines are pressure tested on a gauge before anything is lit. Family owned since 2000. Licensed, bonded and insured, AZ ROC #150707.
Related: water heater replacement, tankless water heaters, appliance gas lines, outdoor gas lines, gas leak repair, water heater rebates.
