Spokane HVAC permit guide: what requires a permit and what it costs

What always requires a permit

**Furnace replacement** (any fuel type): $280-340 permit fee. Mechanical permit through Spokane County Building & Code Enforcement.

**Central AC installation** (new or replacement): $180-280 permit fee. Mechanical permit.

**Heat pump installation**: $280-480 (combined mechanical + electrical). Mechanical permit plus electrical if new circuit needed.

**Ductwork modification** (any change to existing duct system): $180-280 permit fee. Mechanical permit.

**New ductwork install**: same as ductwork modification, $180-280.

**Water heater replacement** (gas): $180-220 permit fee. Plumbing + mechanical permit.

**Boiler replacement**: $280-340 permit fee. Mechanical permit.

**Gas line modification or extension**: $180-280 permit fee. Plumbing + gas permit.

**Electrical service upgrade** (100A → 200A for heat pump): $180-280 permit fee. Electrical permit through Spokane County.

What doesn’t require a permit

**Furnace or AC repair** (parts replacement, no system change): no permit. Capacitor swap, igniter replacement, blower motor replacement, refrigerant recharge — all repair work, no permit.

**Thermostat replacement** (like-for-like): no permit.

**Filter replacement**: no permit. Obviously.

**Ductless mini-split** (single-zone, no electrical upgrade): no permit in Spokane County as of 2024. This changed recently — confirm with us before assuming.

**Portable equipment** (window AC, space heater): no permit.

**Duct sealing** (no new ductwork): no permit. Just repair work.

Permit timelines in Spokane County

**Over-the-counter permits** (simple replacements): same day to 2 business days. Most furnace and AC replacements qualify.

**Plan review permits** (new construction, ductwork redesign, heat pumps in some cases): 5-15 business days. Spokane County Building & Code Enforcement.

**Historic district overlay** (Browne’s Addition, parts of Riverside): add 5-10 business days for preservation review. We coordinate with the Historic Preservation Office.

**Electrical permits** (separate trade): 1-3 business days. We file these through Spokane County Electrical.

**Inspection scheduling**: 1-5 business days after install, depending on inspector workload. We schedule at quote acceptance to lock in a window.

Who pulls the permit

**Always the contractor, not the homeowner.** Washington State law requires the licensed contractor to pull the permit. Homeowner-pulled permits are technically possible for owner-occupied work but create insurance and liability issues.

We pull all permits before the install date. Permit fees are passed through at cost (no markup). You see the line item on the quote.

If a contractor asks you to pull the permit yourself, walk away. They’re either unlicensed, trying to dodge liability, or trying to avoid the permit altogether.

Verify any contractor’s license and permit history at https://secure.lni.wa.gov/ — it’s public record.

What happens if you skip a permit

**Sale complications**: when you sell, the buyer’s inspector pulls permit records. Unpermitted HVAC work shows up. Buyers demand a credit, reduction, or full tear-out and redo. We’ve seen Spokane homeowners lose $5,000-15,000 in sale price over unpermitted work.

**Insurance complications**: homeowners insurance can deny claims related to unpermitted work. Furnace fire? Water damage from a failed install? Insurer may not pay if the original install was unpermitted.

**Safety issues**: permits trigger inspections. Inspections catch safety issues (gas leaks, electrical faults, venting problems). Unpermitted work = no second pair of eyes.

**County fines**: Spokane County can levy fines of $500-5,000 for unpermitted work, especially if discovered during a sale or complaint.

The math: $280 permit + $0 stress > $5,000 surprise at sale. Always.

What inspections cover (so you know what to expect)

**Mechanical inspection** (furnace, AC, heat pump, ductwork): tech from Spokane County visits the install, verifies it matches the permit application, checks clearances to combustibles, refrigerant charge, gas pressure, electrical connections, condensate drainage, and venting.

**Electrical inspection** (separate visit for electrical work): verifies circuit sizing, breaker sizing, grounding, disconnect placement.

**Gas inspection** (separate visit for gas line work): pressure tests the new gas lines, checks for leaks at all connections.

**Final inspection**: after all the above, the inspector signs off. We receive the final approval and close the permit. You get a copy.

The inspector will reject work that doesn’t meet code. This is good — it means the work gets fixed before it becomes a problem.

Costs passed through to you

Most Spokane HVAC permits fall in these ranges:

Single furnace replacement: $280-340

Single AC replacement: $180-280

Heat pump (with electrical): $380-560

Ductwork only: $180-280

Combined furnace + AC: $380-540

Water heater (gas): $180-220

Electrical service upgrade: $180-280

We pass permit fees through at cost. Our quote shows permit as a separate line item so you know what you’re paying for.

How to verify your contractor pulled the permit

After install, ask for the permit card and final inspection sign-off. We email you both within 5 business days of the final inspection.

You can also verify independently: https://spokane county building records portal (or call Spokane County Building & Code Enforcement at 509-477-3675).

If the contractor says “we don’t need to pull a permit for this,” or “it’s a repair not a replacement so no permit,” but it’s actually a system replacement — that’s a red flag. Push back or find another contractor.