Do I Need a Permit to Replace a Water Heater in Wyoming?
Water heater replacement permit requirements. Yes, even for like-for-like swaps. What inspectors check and how to pass.
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.
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 Wyoming
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 |
|---|---|---|
| Casper | $35Verified | Plumbing Permit → |
| Cheyenne | Same valuation-based table as the general Building and Construction Permit Fee (see residential-building-permit fees)Verified | Plumbing Permit → |
| Evanston | $0.010 × project cost (minimum charge $30.00)Verified | Plumbing Permit → |
| Gillette | $10.00Verified | Plumbing Permit → |
| Green River | No separate flat plumbing permit fee is published; charged via the same valuation table as the Building Permit (residential work at 50%; commercial/multi-family at 100%)Verified | Plumbing Permit → |
| Jackson | $56.00Verified | Plumbing Permit → |
| Laramie | $20.00Verified | Plumbing Permit → |
| Riverton | $26.00 minimumVerified | Plumbing Permit → |
| Rock Springs | Charged under the general § 150.08(B) valuation-based building-permit fee schedule — no separate flat plumbing fee line is publishedVerified | Plumbing Permit → |
| Sheridan | $40.00Verified | Plumbing Permit → |
| Unincorporated Albany County | $300.00Verifiedvia Zoning Certificate & Rural Address (county's "Building Permit" stand-in) | Zoning Certificate & Rural Address (county's "Building Permit" stand-in) → |
| Unincorporated Campbell County | No feeVerified | Plumbing Permit → |
| Unincorporated Laramie County | Charged under the general valuation-based Building Permit Fee / Plan Review Fee schedule — no dedicated flat plumbing-permit fee line exists on the county's adopted scheduleVerified | Plumbing Permit → |
| Unincorporated Natrona County | $70 (valuation $0–$2,500) up to $905 plus $9.24 per additional $1,000 over $98,000Verified | Plumbing Permit → |
| Unincorporated Sheridan County | $150.00Verifiedvia Zoning Permit | Zoning Permit → |
| Unincorporated Sweetwater County | $50.00Verifiedvia Zoning/Construction Permit (Land Use) — not a building-code permit | Zoning/Construction Permit (Land Use) — not a building-code permit → |
| Unincorporated Teton County | $60.00Verified | Plumbing Permit → |
| Unincorporated Uinta County | $50.00Verifiedvia Land Use Certificate (Zoning / Use Approval) | Land Use Certificate (Zoning / Use Approval) → |