How much does a spray foam insulation cost in Seattle?

A spray foam insulation in Seattle typically costs $1,801-$7,804, 20% above the $3,500 national average.

What is the cost per sq ft for a spray foam insulation in Seattle?

Spray Foam Insulation in Seattle typically costs $2-$7 per sq ft.

How long does a spray foam insulation take?

A spray foam insulation typically takes 1 day. The minimum timeline is 4-6 hours, and complex projects can run 2-3 days.

Can I DIY a spray foam insulation?

DIY feasibility for a spray foam insulation is rated Limited - DIY kits work for small areas (rim joists, small gaps) but large-scale spray foam requires professional equipment and training.

Cost to Spray Foam Insulation in Seattle, WA (2026)

If you’re budgeting a spray foam insulation in Seattle, most projects run $1,801-$7,804, 20% above the $3,500 national average. What moves that number most is usually one thing: Open-Cell vs. Closed-Cell. On its own it can swing the cost by $1,000 - $4,000, so that’s the decision to slow down on before you sweat the smaller stuff.

Easiest place to save: Use a hybrid approach - 2 inches of closed-cell for the air/vapor barrier, then cheap blown-in fiberglass to reach your target R-value. This saves 30-40% over full closed-cell.

In the West Coast (where Seattle sits): California has strict VOC regulations affecting foam formulations. Higher labor rates.

$1,801-$7,804 in Seattle

20% above the national average · 1.20x cost multiplier

In Seattle, a spray foam insulation runs $1,801 to $7,804 on average - about 20% 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	$2	$3	$7
Materials	$912	$1,938	$3,648
Labor	$791	$1,715	$2,638
Permits	$57	$114	$228
Design	$57	$456	$1,254
Total	$1,817+21% vs. national avg	$4,223+21% vs. national avg	$7,768+20% vs. national avg

Budget

Open-cell spray foam in an open attic floor or crawl space, 500-800 sq ft, 3-4 inches of coverage (R-13)

Mid-Range

Closed-cell spray foam on attic roof deck or basement walls, 800-1,200 sq ft, 2-3 inches of coverage (R-13 to R-19)

Premium

Full closed-cell spray foam application on roof deck and walls, 1,200-1,500 sq ft, 4+ inches (R-26+), with thermal imaging verification

Material Options

Material prices below are national averages; availability in Seattle may shift costs slightly.

Material	Cost/Unit	Pros	Cons	Best For
Open-Cell Spray Foam (0.5 lb density)	$1.00 - $1.75 per sq ft per inch	Lower cost, excellent air sealing, good soundproofing, expands to fill irregular cavities	Lower R-value per inch, absorbs moisture (not for below-grade), requires vapor retarder in cold climates	Interior walls for soundproofing, attic roof deck in warm climates, above-grade applicationsLower cost, excellent air sealing, good soundproofing, expands to fill irregular cavities
Closed-Cell Spray Foam (2.0 lb density)	$1.75 - $3.50 per sq ft per inch	Highest R-value per inch, vapor barrier, adds structural rigidity, moisture resistant	Most expensive option, requires professional installation, off-gases during application	Basement walls, crawl spaces, attic roof deck in cold climates, thin wall cavities where space is limitedHighest R-value per inch, vapor barrier, adds structural rigidity, moisture resistant
DIY Spray Foam Kits	$1.50 - $2.50 per sq ft	No contractor needed, available at home improvement stores, good for small jobs	More expensive per sq ft for large areas, harder to apply evenly, limited coverage per kit	Rim joists, small gaps, band boards, supplemental insulation under 200 sq ftNo contractor needed, available at home improvement stores, good for small jobs
Hybrid System (Closed-Cell + Blown-In)	$1.50 - $2.50 per sq ft (blended rate)	2 inches of closed-cell for air/vapor barrier, then cheaper blown-in to reach target R-value	Two-step installation, requires coordination between trades	Attic roof decks and walls where you want closed-cell benefits at a lower total cost2 inches of closed-cell for air/vapor barrier, then cheaper blown-in to reach target R-value
Low-GWP Spray Foam (HFO-blown)	$2.00 - $4.00 per sq ft per inch	99% lower global warming potential than traditional HFC-blown foam, meets green building standards	10-15% more expensive, not available from all contractors	Green building projects, LEED certification, homeowners prioritizing environmental impact99% lower global warming potential than traditional HFC-blown foam, meets green building standards

Other Projects in Seattle

Full Kitchen Remodel

Full Bathroom Remodel

Composite Deck Building

Back to national average for Spray Foam Insulation

Seattle Estimate

Typical Range

$1,801-$7,804

vs. National Average

20% above national

Cost Multiplier

1.20x

Cost Per sq ft

$2-$7

This 1.20x 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 →