SmartInsulationCalculator

2026 cost data

Insulation Cost in Washington (2026)

Insulation in Washington costs above the national average — ranked 42 of 51 for installed price. Washington sits in climate zone 4, so attics should hit R-60.

Insulation prices per square foot

Installed prices — material plus labor — adjusted for Washington labor rates.

Job typeInstalled cost / sq ft1,500 sq ft attic
Attic blown-in fiberglass (R-49)$2.15$3,219
Attic blown-in cellulose (R-49)$1.97$2,958
Attic fiberglass batts (R-38)$1.86$2,784
Wall batts, open framing (R-15)$2.03$3,045
Wall dense-pack retrofit (drill & fill)$3.02$4,524
Crawlspace floor or wall insulation$2.44$3,654
Basement rigid foam + framing$3.60$5,394
Open-cell spray foam (3.5")$2.26$3,393
Closed-cell spray foam (2")$4.18$6,264
Old insulation removal & disposal$1.80$2,697

What whole jobs cost

Typical projectLocal price range
Attic top-up (1,500 sq ft)$1,740 – $3,016
Full attic removal + re-insulate$3,712 – $6,264
Whole-house wall retrofit (2,000 sq ft home)$4,872 – $9,048
Crawlspace encapsulation + insulation$4,408 – $10,440
Garage conversion insulation$1,044 – $2,552
Whole-home spray foam (new build)$8,700 – $18,560

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

Cities in Washington

Seattle

Insulation cost FAQs for Washington

How much does attic insulation cost in Washington?

A 1,500 sq ft attic blown to R-49 runs about $2,736 to $3,863 installed in Washington, or roughly $2.15 per square foot. DIY with rented equipment cuts that by 45–60%.

Is insulation cheaper to DIY in Washington?

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 Washington?

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 Washington?

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 Washington

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.