Furnace Replacement Cost in Seattle 2026
Furnace Replacement in Seattle costs between $4,944 and $15,537 in 2026, with the average around $8,475. Seattle pricing runs 41% above the US national average. Removal of the old furnace and installation of a new high efficiency gas or electric unit with new venting and a gas or electrical connection. Includes thermostat setup and combustion testing.
What furnace replacement includes in Seattle
Removal of the old furnace and installation of a new high efficiency gas or electric unit with new venting and a gas or electrical connection. Includes thermostat setup and combustion testing.
Typical time on site: 1 day. Local labor rate: $39/hour for an experienced hvac pro.
What changes the price of furnace replacement in Seattle
- Furnace AFUE efficiency
- Gas versus electric
- Venting modifications
- Heating capacity in BTU
- Old unit removal
A furnace replacement quote priced off statewide averages will be off by 10 to 20 percent for Seattle, because the metro has its own labor pool, material delivery distances, and permit timelines.
Seattle climate and demand for hvac
Mild winters with persistent rain (moss/moisture on roofs); rare snow loads; minimal AC historically but warming trend
Seattle permits for furnace replacement
Building department: Seattle Department of Construction and Inspections (SDCI). https://www.seattle.gov/sdci
Typical permit cost: $400 - $5,000 residential. Inspection time: 10-25 business days; plan check 6-12 weeks. Seattle rule: Seattle SDCI has strict energy code (Stretch Code). Tree ordinance affects site work. ADU streamlined permitting. WA L&I license required for all contractors.
Washington sales tax and licensing for HVAC
Washington sales tax: 6.5% + local (~9.3% combined avg) + 0.471% B&O. WASHINGTON TAXES CONTRACTOR LABOR. Retail Sales Tax applies to total construction contract (labor + materials) on speculative builders. Custom construction taxed differently.
State license: Washington Department of Labor and Industries (L&I), required: $117 (initial) + $12K bond + insurance.
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