Do I Need a Permit to Replace a Water Heater in Wyoming?
Quick Answer
Yes — even for a like-for-like replacement.
Wyoming-specific rules
Wyoming has no statewide building code, and local enforcement is opt-in under W.S. § 35-9-121 (many unincorporated areas require no building permit at all). The Council on Fire Prevention and Electrical Safety adopts minimum statewide fuel-gas standards under § 35-9-106 (relevant to a gas water heater's connection and venting), but whether a permit and inspection are required depends on whether your jurisdiction has adopted and enforces a code. Confirm locally.
Sources: Wyoming State Fire Marshal — adopted minimum standards (W.S. § 35-9-106 / 121)
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.