Cost to Ductwork Installation in Seattle, WA (2026)
If you’re budgeting a ductwork installation in Seattle, most projects run $2,485-$9,941, 24% above the $3,800 national average. What moves that number most is usually one thing: Duct Material: Flex vs. Sheet Metal vs. Fiberglass. On its own it can swing the cost by $3 - $20 per linear foot, so that’s the decision to slow down on before you sweat the smaller stuff.
Easiest place to save: Before replacing ducts, have a duct leakage test done ($150-$300) - if your system leaks less than 10% of total flow, sealing may be sufficient instead of replacement, saving thousands.
In the West Coast (where Seattle sits): California's Title 24 building code requires duct leakage testing in new systems, adding $150-$300 to the project. Labor rates are among the highest in the nation. Seismic bracing requirements for ductwork add cost in earthquake zones.
$2,485-$9,941 in Seattle
24% above the national average · 1.24x cost multiplier
In Seattle, a ductwork installation runs $2,485 to $9,941 on average - about 24% above what homeowners pay nationwide. The West Coast market's labor costs account for most of the gap, with material pricing and local permitting fees adding to the spread. Use the cost table below to compare budget, mid-range, and premium options side by side.
Cost Breakdown in Seattle
| Line Item | Low | Mid | High |
|---|---|---|---|
| Cost per linear ft | $12 | $25 | $50 |
| Materials | $684 | $1,710 | $3,990 |
| Labor | $1,583 | $3,297 | $7,913 |
| Permits | $342 | $570 | $912 |
| Total | $2,609+24% vs. national avg | $5,577+24% vs. national avg | $12,815+24% vs. national avg |
Budget
Flex duct replacement, accessible attic or crawl space, straightforward run
Mid-Range
Sheet metal main trunk with flex branches, new system for 1,500 sq ft
Premium
Sheet metal throughout, exposed basement, complex multi-zone layout, test and balance
Material Options
Material prices below are national averages; availability in Seattle may shift costs slightly.
| Material | Cost/Unit | Best For |
|---|---|---|
| Flexible Duct (Flex Duct) | $4 - $8 per linear foot installed | Branch runs in accessible attics, budget-conscious repairs, short runsCheap, fast to install, flexible routing around obstacles, widely available |
| Sheet Metal (Galvanized Steel) | $12 - $25 per linear foot installed | Main trunk lines, commercial applications, high-performance systemsDurable (40+ year lifespan), smooth interior for maximum airflow, takes mastic sealant well |
| Fiberglass Duct Board | $10 - $18 per linear foot installed | Conditioned attic spaces, commercial buildings, systems with quietness requirementsBuilt-in insulation (R-4 to R-6), lightweight, quieter than metal |
| Insulated Flexible Duct | $6 - $12 per linear foot installed | Branch runs in unconditioned attics or crawl spaces where insulation is neededCombines flex routing with R-6 to R-8 insulation in one product |
| Spiral Round Duct | $15 - $30 per linear foot installed | Exposed basement or industrial-aesthetic installations, high-efficiency systemsExtremely smooth interior (lowest friction loss), visually attractive for exposed installations |
Other Projects in Seattle
Seattle Estimate
Typical Range
$2,485-$9,941
vs. National Average
24% above national
Cost Multiplier
1.24x
Cost Per linear ft
$12-$50
This 1.24x estimate prices Seattle labor from BLS Occupational Employment and Wage Statistics (May 2025) and applies a lighter regional adjustment to materials and permits, which vary less by metro than labor does. Actual bids vary by contractor, project scope, and timing.
See national average costs →