Do I Need a Permit to Replace a Water Heater in Arizona?
Quick Answer
Yes — even for a like-for-like replacement.
Why a Simple Swap Needs a Permit
Most jurisdictions require a permit for all water heater replacements, even when you're installing the same type and size. The permit ensures proper venting, gas connections, temperature/pressure relief valve discharge, and seismic strapping. Improper water heater installations are a leading cause of residential CO poisoning and water damage.
What Inspectors Check
The inspector will verify: gas line connections and drip leg (sediment trap), proper venting (metal B-vent for standard, PVC for high-efficiency), T&P relief valve discharging to within 6 inches of the floor or exterior, seismic strapping (two straps — upper and lower third), and adequate combustion air supply.
Tankless Conversion
Converting from a tank to tankless water heater often requires additional work: a larger gas line (tankless units draw more BTUs), PVC venting (most tankless units are high-efficiency), and potentially an electrical outlet for the unit. This may trigger both plumbing and gas permits.
DIY vs. Hiring a Plumber
Many jurisdictions allow homeowners to replace their own water heater in their primary residence — confirm with your city. You still must pull the permit and pass inspection. Most homeowners hire a licensed plumber because the permit and inspection process is simpler when the contractor handles it.
Bottom Line
Yes, you need a $40-$60 permit. It's a quick same-day approval and one final inspection. Don't skip it — it protects you and your home.
Permit fees by city in Arizona
Verified from each city’s published fee schedule. Where a city has no separate fee listed for this project, open the city page for the current requirements and amount.
| City | Permit fee | Source |
|---|---|---|
| Chandler | $100.00Verified | Plumbing Permit → |
| Gilbert | $150Verified | Plumbing Permit → |
| Glendale | $29.79 base feeVerified | Plumbing Permit → |
| Mesa | $0–$8,333: $220; $8,334–$16,667: $330; $16,668–$24,999: $440; $25,000–$200,000: $500 plus $6/each $1,000 over $25,000Verified | Plumbing Permit (Stand-Alone) → |
| Peoria | Minimum fee $87. Valuation-based permit fee per Development Fee Schedule. There is no separate flat-fee plumbing schedule; valuation is based on the scope of work.Verified | Plumbing Permit (incl. Water Heater) → |
| Phoenix | $1–$1,000: $98 minimum for residential water heaters (otherwise $195 base fee); $1,001–$10,000: $195 on first $1,000 plus $12 per additional $1,000; larger projects per Table A tiers.Verified | Plumbing Permit (incl. Water Heater) → |
| Scottsdale | $63Verified | Water Heater Permit → |
| Surprise | Base: $100 per permit. Valuation $1.00–$999,999.99: $6.00 per each $1,000 of valuation. Plus 0.50% administrative processing fee on valuation.Verified | Plumbing Permit (incl. Water Heater) → |
| Tempe | $242 (includes plan review)Verified | Plumbing Permit (incl. Water/Sewer Line Replacement) → |
| Unincorporated Maricopa County | $50 flat eachVerified | Plumbing Permit → |