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2026 cost data

Insulation Cost in Washington, DC (2026)

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

Insulation prices per square foot

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

Job typeInstalled cost / sq ft1,500 sq ft attic
Attic blown-in fiberglass (R-49)$2.41$3,608
Attic blown-in cellulose (R-49)$2.21$3,315
Attic fiberglass batts (R-38)$2.08$3,120
Wall batts, open framing (R-15)$2.27$3,413
Wall dense-pack retrofit (drill & fill)$3.38$5,070
Crawlspace floor or wall insulation$2.73$4,095
Basement rigid foam + framing$4.03$6,045
Open-cell spray foam (3.5")$2.54$3,803
Closed-cell spray foam (2")$4.68$7,020
Old insulation removal & disposal$2.02$3,023

What whole jobs cost

Typical projectLocal price range
Attic top-up (1,500 sq ft)$1,950 – $3,380
Full attic removal + re-insulate$4,160 – $7,020
Whole-house wall retrofit (2,000 sq ft home)$5,460 – $10,140
Crawlspace encapsulation + insulation$4,940 – $11,700
Garage conversion insulation$1,170 – $2,860
Whole-home spray foam (new build)$9,750 – $20,800

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 Washington metro compares with the rest of District of Columbia.

Insulation cost in District of Columbia →

Insulation cost FAQs for Washington, DC

How much does attic insulation cost in Washington, DC?

A 1,500 sq ft attic blown to R-49 runs about $3,066 to $4,329 installed in Washington, DC, or roughly $2.41 per square foot. DIY with rented equipment cuts that by 45–60%.

Is insulation cheaper to DIY in Washington, DC?

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, DC?

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, DC?

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, DC

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

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