Cost to Wall Insulation (Blown-In) in Seattle, WA (2026)
If you’re budgeting a wall insulation (blown-in) in Seattle, most projects run $1,254-$6,268, 25% above the $2,500 national average. What moves that number most is usually one thing: Wall Area (Square Feet). On its own it can swing the cost by $500 - $4,000, so that’s the decision to slow down on before you sweat the smaller stuff.
Easiest place to save: The IRA 30% Energy Efficient Home Improvement Credit covers blown-in wall insulation costs up to $1,200 per year. Combine this with utility rebates to cut your net cost by 40-60%.
In the West Coast (where Seattle sits): High labor costs push installed prices above the national average. Many California homes have stucco exteriors, which requires careful drilling and patching - typically adding 15-20% to the labor cost. Utility rebates through Energy Upgrade California can offset a significant portion of cost.
$1,254-$6,268 in Seattle
25% above the national average · 1.25x cost multiplier
In Seattle, a wall insulation (blown-in) runs $1,254 to $6,268 on average - about 25% 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 sq ft | $1 | $3 | $5 |
| Materials | $456 | $1,026 | $2,280 |
| Labor | $1,055 | $2,374 | $4,616 |
| Permits | $0 | $0 | $228 |
| Total | $1,511+26% vs. national avg | $3,400+26% vs. national avg | $7,124+25% vs. national avg |
Budget
Blown-in cellulose, 1,000 sq ft of exterior wall, drill-and-fill method, patch holes
Mid-Range
Dense-pack cellulose or fiberglass, 2,000 sq ft, existing home retrofit with patching
Premium
Spray foam or high-performance dense-pack, full exterior envelope, older home
Material Options
Material prices below are national averages; availability in Seattle may shift costs slightly.
| Material | Cost/Unit | Best For |
|---|---|---|
| Blown-In Cellulose (Standard) | $1.00 - $2.00 per sq ft installed | Most retrofits - the default choice for drill-and-fill wall insulationRecycled content, excellent air-sealing properties, R-3.5/inch, fire-treated, widely available |
| Blown-In Fiberglass (Standard) | $1.00 - $2.00 per sq ft installed | Humid climates where moisture management is a concernDoes not settle, moisture-resistant, R-2.2-2.7/inch, lighter than cellulose |
| Dense-Pack Cellulose | $1.50 - $2.50 per sq ft installed | Exterior walls where settling would reduce performance, high-performance retrofitsHigher density (3.5 lbs/cubic ft) virtually eliminates settling, better air sealing than standard blown-in |
| Open-Cell Spray Foam (R-3.7/inch) | $2.00 - $3.50 per sq ft installed | New construction or gut renovations where walls are already openExcellent air sealing, fills irregular cavities completely, soft and flexible |
| Closed-Cell Spray Foam (R-6.5/inch) | $3.00 - $5.00 per sq ft installed | New construction, below-grade walls, extremely cold climates needing maximum R-valueHighest R-value per inch, acts as vapor barrier, rigid structural improvement |
Other Projects in Seattle
Seattle Estimate
Typical Range
$1,254-$6,268
vs. National Average
25% above national
Cost Multiplier
1.25x
Cost Per sq ft
$1-$5
This 1.25x 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 →