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Attic insulation cost in Seattle (2026):
prices by type and the PSE rebate

By Oleksii Chelbaiev Last checked November 10, 2026 5 sources

HOW MUCH DOES ATTIC INSULATION COST IN SEATTLE?

$991–$2,122

HomeAdvisor puts attic insulation in Seattle at $991 to $2,122, with an average of $1,661. Angi's national figures are $1 to $3 per square foot, $2,100 on average. If PSE heats your home, PSE's weatherization rebate pays $1.75 per square foot (up to $3,500) to bring an attic from R-11 or less to R-49, through a PSE-approved contractor.

Published estimates, not quotes. Attic size, insulation type and removing old insulation change the price most.

Illustration of a house cutaway showing an attic with a thick layer of blown-in insulation between the joists, a ruler marking the depth, and a hose from an insulation blower running up through the attic hatch. — Illustration. Attic area, insulation type and depth set the price.

Attic insulation cost in Seattle

HomeAdvisor / Angi, attic insulation contractors in Seattle, WA (accessed November 2026, no date given); Angi, attic insulation cost (2025 data).
Source	Reported cost
HomeAdvisor, Seattle: typical range	$991–$2,122
HomeAdvisor, Seattle: average	$1,661
HomeAdvisor, Seattle: low / high	$600 / $4,000
Angi, national average	$2,100 (typical $1,700–$2,500)

Cost by insulation type

Angi, attic insulation cost (national figures, 2025 data).
Type	Per square foot
Blown-in (fiberglass or cellulose)	$1–$4
Batt	$2–$4
Loose fill	$2–$5
Spray foam	$2–$5
Removing old insulation	$1–$1.50

Rebates and free programs

Puget Sound Energy, weatherization rebates (accessed November 2026). PSE says the program is tariffed and can change without notice.
PSE weatherization rebate	Amount
Attic, from R-11 or less to R-49	$1.75 per sq ft, up to $3,500
Attic, from R-12–R-19 to R-49	$0.50 per sq ft, up to $1,000
Wall insulation	$2.50 per sq ft, up to $5,000
Floor insulation	$2.50 per sq ft, up to $5,000

Who qualifies for PSE's rebate: current PSE customers whose home is heated mainly by PSE electricity or natural gas; single-family homes (four units or fewer) built in 1989 or earlier, or manufactured homes built in 2000 or earlier.
Use a network contractor. PSE requires a PSE Recommended Energy Professional or Trade Ally; you can't use an out-of-network contractor or do the work yourself. The rebate comes off the contractor's invoice.
Seattle City Light customers: City Light's HomeWise Weatherization Program offers free energy-efficiency improvements, including insulation, to income-qualified households, based on income and home location.

Example: a 1,000 sq ft attic with PSE's rebate

Our calculation from Angi's per-square-foot range, Seattle's 10.55% rate (Washington Department of Revenue, October–December 2026) and PSE's rebate. Only for homes heated mainly by PSE. PSE applies the rebate as a discount on the contractor's invoice; ask how it will appear on yours.
Item	Low	High
Blown-in insulation, 1,000 sq ft at $1–$4	$1,000	$4,000
Seattle sales tax, 10.55%	$106	$422
PSE rebate, R-11 or less to R-49 ($1.75 × 1,000)	−$1,750	−$1,750

Washington taxes improvements to a home on the whole contract, labor included. See sales tax on home repairs.

Before you sign

Get the attic area, the insulation type, and the R-value before and after in writing.
Ask whether removing old or damp insulation is included, and why it's needed.
For PSE's rebate, confirm the contractor is a PSE Recommended Energy Professional or Trade Ally before you sign.
Heating with gas or oil and thinking of switching? See gas furnace to heat pump cost and heat pump rebates in Washington.

Frequently asked questions

How much does attic insulation cost in Seattle?

HomeAdvisor puts attic insulation in Seattle at $991 to $2,122, with an average of $1,661. Angi's national figures are $1 to $3 per square foot.

Does PSE give a rebate for attic insulation?

Yes, if PSE electricity or natural gas is your main heat. PSE pays $1.75 per sq ft (up to $3,500) to go from R-11 or less to R-49, or $0.50 per sq ft (up to $1,000) from R-12–R-19, through a network contractor.

How much does blown-in insulation cost?

Angi lists blown-in insulation at $1 to $4 per square foot, compared with $2 to $4 for batts and $2 to $5 for spray foam.

How much does it cost to remove old attic insulation?

Angi lists $1 to $1.50 per square foot to have an insulator remove old insulation.

Is there free insulation for Seattle City Light customers?

City Light's HomeWise Weatherization Program offers free energy-efficiency improvements, including insulation, to income-qualified households, based on income and home location.

About these prices. The ranges are published estimates from the sources below, as of the dates shown. Material costs, labor rates, tariffs and inflation can change prices after those dates, and your home may differ. Use them to plan a budget, then get written quotes from licensed contractors.

Sources

All sources accessed November 10, 2026.

This guide summarizes published cost estimates and utility programs. Rebates change; confirm eligibility with PSE or Seattle City Light before work starts. See our disclosure and disclaimer.