Home Cost Report

Gas furnace replacement cost in Seattle

Gas furnace replacement in Seattle costs about $3,300 to $14,200 (typically $7,400) — local prices run about 18% above the national average.

These figures adjust our national gas furnace replacement range to Seattle's local cost level — see the method and sources below.

Low
$3,300
Typical
$7,400
High
$14,200

How we localized this

We start from our national gas furnace replacement range of $2,800–$12,000 and adjust it for Seattle, where costs run about 18% above the national average. Seattle is one of the more expensive U.S. metros for home-improvement work. A cost-index comparison frames Seattle renovation pricing as about 28% above the national average, while the multiplier it actually applies to project estimates is 20% above; other local remodeling guides put the range as high as 25–50% above, largely citing tech-sector wage competition for skilled trades. Mortenson's quarterly index shows Seattle's recent cost growth running below the national pace, which points to a market absorbing pressure rather than one still accelerating — but the underlying level remains high. We apply about 18% above national, close to the more conservative of the cited multipliers. Materials are priced roughly nationally, so treat this as an approximation — your actual price depends on your home, contractor, and project specifics.

Seattle cost sources (2)

Tech-sector wage competition pulls up pay for skilled trades across the metro, and strong, steady demand leaves many contractors with little scheduling downtime. The Seattle Department of Construction and Inspections (SDCI) processes permits online, but timelines vary widely — simple permits often clear in 2–4 weeks, while structural work or an accessory dwelling unit (ADU) can take 3–6 months. Seattle's wet climate makes roofing and decking material choices matter more than in drier regions; composite decking and metal roofing cost more upfront but hold up better against sustained rainfall than wood or standard asphalt. ADU construction is especially active here, driven by the region's housing shortage and comparatively permissive local rules.

Estimate your Seattle gas furnace replacement

Adjust for your furnace and install. The estimate starts from our published range and narrows for your choices.

Adjusts the estimate to local cost levels. Pick a metro or leave on national.

AFUE is the share of fuel turned into heat. Higher = lower bills, higher price.

Estimated cost for your options in Seattle
$3,300 – $14,200
Typical: $7,400
Adjusted for Seattle — costs there run about 18% above the national average.

How we got this

Starts from our published gas furnace replacement range of $2,800–$12,000, adjusted for:

  • Efficiency (AFUE): Standard (80% AFUE)×1
  • Furnace size: Average (60k–80k BTU · ~1,600–2,000 sq ft)×1
  • Installation: Straight swap (same location)×1
  • Area: Seattle×1.18

These figures are planning estimates compiled from public cost data on the dates shown — not quotes, bids, or guarantees. Real prices vary widely with your home, location, materials, permits, and contractor. Always get itemized written quotes from licensed local pros before budgeting or hiring.

What changes the price

  • Efficiency (AFUE) — Raises cost

    96%+ AFUE units cost more and need different venting, but burn less gas.

  • Furnace size (BTU) — Raises cost

    Bigger homes need higher heat output, which raises unit and labor cost.

  • Venting & gas line changes — Raises cost

    Switching efficiency tiers or moving the unit can require new venting or gas work.

  • Brand & warranty — Raises cost

    Premium brands and longer warranties cost more.

  • Rebates & tax credits — Lowers cost

    High-efficiency furnaces may qualify for utility rebates or federal credits.

Get real quotes for your Seattle gas furnace replacement

Our ranges are for planning. The only way to know your real price is itemized quotes from licensed local pros — always get at least three before you hire.

Tip: search for licensed, insured Seattle gas furnace replacement contractors in your area, check reviews and references, and compare written itemized bids — not just bottom-line numbers.

Gas furnace replacement cost — FAQ

How much does it cost to replace a gas furnace?
Most homeowners pay $4,000–$10,000 installed, within a broader range of about $2,800 to $12,000. A typical 1,600–2,000 sq ft home lands around $4,500–$7,000 for a standard unit. Efficiency (AFUE), size, and installation complexity are the main drivers.
Is a high-efficiency furnace worth the extra cost?
A 96%+ AFUE furnace costs more upfront but burns less gas; the payback depends on your climate and gas prices, and is faster in cold regions. High-efficiency models also need different (sealed) venting, which adds to the install cost.
How much is just the furnace unit?
The furnace itself runs roughly $700–$6,200 depending on size, brand, and efficiency; high-efficiency units alone are about $2,800–$6,200. The rest of the project is labor, venting, and permits.
Should I replace my furnace and AC at the same time?
If both are old, replacing them together is common — you pay one labor mobilization and the components stay matched. If only one has failed and the other is newer, replacing just the failed unit is usually fine.

Cost data compiled June 13, 2026.

Sources (4)

Ranges synthesize several public 2026 cost guides into a low–typical–high band rather than reproducing any single source's table. Metro-level breakdowns are coming as we verify local data.

Compare other locations

See all Seattle HVAC costs on the Seattle HVAC page.

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