SmartInsulationCalculator

2026 cost data

Insulation Cost in Seattle, WA (2026)

Insulation contractors in Seattle, WA price well above the national average. Here is what attic, wall, crawlspace and spray foam work should cost in the Seattle metro in 2026.

Insulation prices per square foot

Installed prices — material plus labor — adjusted for Seattle, WA labor rates.

Job typeInstalled cost / sq ft1,500 sq ft attic
Attic blown-in fiberglass (R-49)$2.29$3,441
Attic blown-in cellulose (R-49)$2.11$3,162
Attic fiberglass batts (R-38)$1.98$2,976
Wall batts, open framing (R-15)$2.17$3,255
Wall dense-pack retrofit (drill & fill)$3.22$4,836
Crawlspace floor or wall insulation$2.60$3,906
Basement rigid foam + framing$3.84$5,766
Open-cell spray foam (3.5")$2.42$3,627
Closed-cell spray foam (2")$4.46$6,696
Old insulation removal & disposal$1.92$2,883

What whole jobs cost

Typical projectLocal price range
Attic top-up (1,500 sq ft)$1,860 – $3,224
Full attic removal + re-insulate$3,968 – $6,696
Whole-house wall retrofit (2,000 sq ft home)$5,208 – $9,672
Crawlspace encapsulation + insulation$4,712 – $11,160
Garage conversion insulation$1,116 – $2,728
Whole-home spray foam (new build)$9,300 – $19,840

Climate zone 4 R-value targets

Department of Energy retrofit recommendations for this zone.

Attic
R-60
Walls
R-20
Floors
R-30
Check your current R-value →

Price your own job

These tables are averages. Punch in your real measurements for a number you can compare against a bid.

Insulation costAtticBlown-in bagsProject total

Statewide context

See how the Seattle metro compares with the rest of Washington.

Insulation cost in Washington →

Insulation cost FAQs for Seattle, WA

How much does attic insulation cost in Seattle, WA?

A 1,500 sq ft attic blown to R-49 runs about $2,925 to $4,129 installed in Seattle, WA, or roughly $2.29 per square foot. DIY with rented equipment cuts that by 45–60%.

Is insulation cheaper to DIY in Seattle, WA?

Yes. Labor is most of an insulation bid, so blowing your own attic or installing batts typically saves 45–60% of the installed price. Spray foam, dense-pack wall retrofits and removal jobs are worth hiring out.

What drives insulation prices in Seattle, WA?

Local labor rates, how far crews travel, attic access, whether old insulation has to be removed first, and the R-value your climate zone calls for. Material prices barely change between states — labor is the swing factor.

Are there rebates in Seattle, WA?

The federal 25C tax credit covers 30% of insulation and air-sealing material costs up to $1,200 per year, and most utilities add their own attic and air-sealing rebates. Always check with your utility before booking work.

Materials for an insulation job in Seattle, WA

Fiberglass Insulation Rolls R13Browse current prices and top-rated options on Amazon

As an Amazon Associate we earn from qualifying purchases. Product links on this page may earn us a commission at no extra cost to you.