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 type | Installed cost / sq ft | 1,500 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 project | Local 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
Price your own job
These tables are averages. Punch in your real measurements for a number you can compare against a bid.
Cities in District of Columbia
Metro estimates are on the insulation cost by city page.
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 (30% of insulation and air-sealing materials, up to $1,200 a year) only covered improvements made through December 31, 2025. For work done now, most utilities offer their own attic and air-sealing rebates, and income-qualified households can get free weatherization. Always check with your utility before booking work.
Materials for an insulation job in District of Columbia
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