Washington pricing

Furnace Replacement Cost Calculator — Washington

Estimate what a furnace replacement should cost by output, efficiency and venting work. Every figure below is already adjusted for Washington labor and material pricing.

Verified August 2026

Does furnace replacement cost cost more in Washington?

+16% versus the national baseline

The State Energy Code is among the most demanding in the country and is pushing heat pumps to the default HVAC replacement, which changes both cost and rebate eligibility. Permit fees here run about 15% off the national average, and Homeowner permits allowed on owner-occupied property

Heating output

Cost per 1,000 BTU installed($)

Efficiency

Venting changes

Old furnace removal

Permit fee($)

Estimated installed cost

$5,425 – $7,707

Furnace and labor: $5,568
Venting work: $0
Removal and permit: $597

Estimates only. Local pricing, site conditions and code requirements change the real number.

What changes the number in Washington

Local cost indexAbove the national baseline	1.16x national
Permit fee index	1.15x national
Code basisStatewide code applies	Washington State Residential Code, based on the IRC, plus the State Energy Code
Owner-builder posture	Homeowner permits allowed on owner-occupied property
Largest markets	Seattle, Spokane, Tacoma, Vancouver

The formula

Cost = base unit cost x efficiency multiplier + venting + removal + permit

High-efficiency condensing furnaces (90%+ AFUE) need new PVC venting and a condensate drain, which is why the jump from 80% to 96% AFUE costs more than the equipment difference alone.

Frequently asked questions

How much is a new furnace installed?

Most homeowners pay $4,000 to $8,500 for a replacement gas furnace in 2026. Electric furnaces are cheaper to install but cost far more to run.

How long does a furnace last?

15 to 20 years for a gas furnace with annual service. Past year 15, repairs over about $1,500 usually favor replacement.

Sources

Sources & verification

Washington State Building Code Council

Last verified August 2026. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing — they are not quotes. Permit rules change; confirm with the building department before starting work.