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

The City's amendments to the 2024 International Residential Code list work that needs no permit in Section R105.2. The same sentence appears twice, once under Gas (item 4) and once under Plumbing (item 5): "Replacement of existing water heaters which are of the same size, type, and method of operation and were previously installed with a valid building permit."

The residential code covers detached one- and two-family homes and townhouses up to three stories. For every other building, Surprise's amendments to the 2024 International Building Code apply, and Section 105.2 words the exemption differently:

• Gas (item 3). "Replacement of gas water heating appliances, by a licensed contractor, of equal or lesser BTU/CFH rating and without modification to electrical, mechanical, and plumbing connections necessary to serve the new appliance."
• Plumbing (item 3). The same exemption for electric water heating appliances "of equal or less amperage rating."

Both lists open with the same warning: an exemption "shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code." No permit does not mean no code. The new heater still has to be installed the way the code says.

The same R105.2 Plumbing list exempts several things people often put in with a new water heater: hot water re-circulators (item 3), water softeners and soft water loops (item 4), water filtration and purification systems (item 7) and solar pool and spa heating equipment (item 6). Under Gas, a pool or spa heater of equal or lesser BTU capacity in the same location is exempt (item 5). That matters in Surprise, where the City's 2025 water reports put average hardness at 3.9 to 6.2 grains per gallon across its three systems, and hard water is a common reason to add a softener when the heater is replaced.

• Same size. The amendment does not define it. Read it as the same capacity and input rating as the old heater. A 40-gallon tank swapped for a 50 is a different size.
• Same type. A storage tank for a storage tank. A tank swapped for a tankless unit, or a heat pump water heater for a standard electric tank, is a different type.
• Same method of operation. The same fuel and the same way of heating: gas for gas, electric for electric.
• Previously installed with a valid building permit. The old heater has to have gone in on a permit. About 77 percent of Surprise homes were built in 2000 or later, so in many homes the heater in place is the one the house was built with. A heater someone swapped earlier without a permit does not meet this condition.
• Licensed contractor. Only the commercial exemption names one. The residential sentence does not say who does the work.

A house, duplex or townhouse in Surprise where the old heater is being swapped for the same kind, at the same size. A commercial building, apartment complex or store falls under the building code version instead, where the swap must be done by a licensed contractor with no change to the connections.

Not every address with a Surprise mailing address is inside the City. A home in unincorporated Maricopa County follows the County's permit rules, which have their own water heater exemption.

A 2005 tract home in the north of the city. The 50-gallon gas tank in the garage leaks at the base. A plumber puts in a new 50-gallon gas tank on the same gas, water and vent connections. That is the same size, type and method of operation, and the original heater went in on the home's building permit, so no permit is needed.

The same home, but the owner wants tankless. A tankless unit is a different type and usually needs a bigger gas line, new venting and sometimes a new outlet. A permit is needed, and the gas line sizing and venting will be part of the review.

A restaurant in a strip center. The tenant's gas water heater fails. A licensed contractor replaces it with a unit of the same or lower BTU rating on the existing connections, so the building code exemption applies. If the new unit is bigger or the gas line has to change, it is permit work.

1. 1Check the old heater's label for its size, fuel and input rating, and pick a new one that matches if you want to stay inside the exemption.
2. 2If you are changing size, fuel or type, plan on a permit and apply through the City's Permits and Applications portal.
3. 3If you do not know whether the old heater was permitted, ask Community Development to look up the address before the swap.
4. 4For a commercial building, use a licensed contractor and keep every connection the same, or pull a permit.
5. 5If a permit is pulled, start work within 180 days, and do not let more than 180 days pass between inspections.

If the old heater has failed, HQ repairs and replaces tank and tankless water heaters in Surprise and across the West Valley. Our water heater page covers repair, replacement and tankless options, and the Surprise plumber page covers the city's water systems and permits.

Not under its residential code. The table in Surprise's amendments to IRC Section R301.2 lists the city's seismic design category as B. The 2024 IRC's water heater anchoring rule applies in seismic design categories D0, D1 and D2 (and to townhouses in category C), so a house in Surprise has no code strap requirement. A manufacturer's instructions can still call for one. Our FAQ on water heater strapping in Arizona covers the rest.

When a permit is needed, the City's Citywide Fee Schedule (Resolution 2026-16, effective May 19, 2026) sets the building permit fee at $100.00 per permit plus $6.00 per $1,000 of the job's valuation, with plan review at 65% of the permit fee where the job needs review. The schedule does not list a separate water heater line, so the total depends on how the City values the job.

A heater that leaks from the tank itself has to be replaced; a tank cannot be patched. A gas heater that will not light, an electric one with no hot water, or a dripping relief valve is often a part that can be repaired. Age and how often it has failed decide the rest.

What moves the price of a replacement is mostly what this page is about: the same size and fuel on the same connections is the simplest job, while a bigger tank, a switch to tankless or another fuel, new gas or vent piping, and the permit and inspection that come with them add work. We confirm the price before any work starts.

• "Like for like means any new water heater." Surprise's rule is narrower: the same size, type and method of operation, and the old one had to be permitted.
• "Tankless is just a newer water heater." It is a different type, so it is permit work.
• "The commercial rule and the home rule are the same." The home rule names no installer. The commercial rule requires a licensed contractor and no change to the connections.
• "Phoenix's rule applies in Surprise." Each city adopts and amends the code on its own. Surprise's answer is in its own amendments.

Residential amendment R105.5 says a permit becomes invalid if work does not start within 180 days, or if more than 180 days pass between inspections. The building official can grant written extensions of up to 180 days each. Section 105.5.1 adds that every permit expires 24 months after it is issued, and work without a final inspection stops until a new permit is pulled.

Under the building code amendments, section 109.4, anyone who starts work before getting a required permit may be charged a fee on top of the normal permit fees. The City's fee schedule bases the building permit fee on the job's valuation.

The City's amendments document and the fee schedule are linked above. This page explains them, and the official text governs.