Do I Need a Permit to Replace a Furnace in Nevada?
Quick Answer
Yes — even a like-for-like furnace swap requires a mechanical permit.
Why Even a Swap Needs a Permit
Furnace replacements involve gas connections, venting, and combustion air — all safety-critical systems. Most jurisdictions require a mechanical permit to verify the new furnace is properly vented, has adequate combustion air, and the gas connections are leak-free. This is true even for exact same-model replacements.
High-Efficiency Conversions
Upgrading from a standard-efficiency (80%) to high-efficiency (90%+) furnace changes the venting requirements: standard units use metal B-vent, high-efficiency units use PVC/CPVC. The old metal vent chase may need to be sealed. A condensate drain line is also required for high-efficiency units.
What Inspectors Check
The final inspection covers: gas piping and drip leg, venting type and clearances, combustion air supply (especially in confined spaces), condensate drain (high-efficiency units), thermostat operation, and CO detector presence on every level.
Bundled with AC?
If you're replacing both the furnace and AC unit at the same time, one mechanical permit typically covers both. The inspector will check the AC refrigerant lines, electrical disconnect, and condenser pad in addition to the furnace items.
Bottom Line
Yes, always. The permit is $40-$75 and your HVAC contractor handles it. One final inspection. Don't skip it — CO poisoning from bad venting is real.
Permit fees by city in Nevada
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 |
|---|---|---|
| Carson City | Varies — valuation-based (1.5% of value, $65 min)Verified | Mechanical / HVAC Permit → |
| Douglas County | $167.93 (flat fee)Verified | Mechanical / HVAC Permit → |
| Henderson | $360Verified | Mechanical / HVAC Permit → |
| Las Vegas | $100 inspection + $83 plan check = $183 total (plus $55 admin)Verified | Mechanical / HVAC Permit → |
| Mesquite | Square footage × $0.040Verified | Mechanical / HVAC Permit → |
| North Las Vegas | $75 per permitVerified | Mechanical / HVAC Permit → |
| Reno | $45.00Verified | Mechanical / HVAC Permit → |
| Sparks | Varies — valuation-based (see Sparks tiered permit fee table; mechanical fees = 100% of the principal amount)Verified | Mechanical / HVAC Permit → |
| Unincorporated Clark County | $54.00Verified | Mechanical / HVAC Permit → |
| Unincorporated Washoe County | $45.00Verified | Mechanical / HVAC Permit → |