SmartInsulationCalculator

2026 cost data

Insulation Cost in District of Columbia (2026)

Insulation in District of Columbia costs well above the national average — ranked 47 of 51 for installed price. District of Columbia sits in climate zone 4, so attics should hit R-60.

Insulation prices per square foot

Installed prices — material plus labor — adjusted for District of Columbia 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

Cities in District of Columbia

Washington

Insulation cost FAQs for District of Columbia

How much does attic insulation cost in District of Columbia?

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

Is insulation cheaper to DIY in District of Columbia?

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 District of Columbia?

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 District of Columbia?

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 District of Columbia

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

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