SmartInsulationCalculator

2026 cost data

Insulation Cost in Delaware (2026)

Insulation in Delaware costs above the national average — ranked 31 of 51 for installed price. Delaware sits in climate zone 4, so attics should hit R-60.

Insulation prices per square foot

Installed prices — material plus labor — adjusted for Delaware labor rates.

Job typeInstalled cost / sq ft1,500 sq ft attic
Attic blown-in fiberglass (R-49)$1.94$2,914
Attic blown-in cellulose (R-49)$1.78$2,678
Attic fiberglass batts (R-38)$1.68$2,520
Wall batts, open framing (R-15)$1.84$2,756
Wall dense-pack retrofit (drill & fill)$2.73$4,095
Crawlspace floor or wall insulation$2.21$3,308
Basement rigid foam + framing$3.26$4,883
Open-cell spray foam (3.5")$2.05$3,071
Closed-cell spray foam (2")$3.78$5,670
Old insulation removal & disposal$1.63$2,441

What whole jobs cost

Typical projectLocal price range
Attic top-up (1,500 sq ft)$1,575 – $2,730
Full attic removal + re-insulate$3,360 – $5,670
Whole-house wall retrofit (2,000 sq ft home)$4,410 – $8,190
Crawlspace encapsulation + insulation$3,990 – $9,450
Garage conversion insulation$945 – $2,310
Whole-home spray foam (new build)$7,875 – $16,800

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

Insulation cost FAQs for Delaware

How much does attic insulation cost in Delaware?

A 1,500 sq ft attic blown to R-49 runs about $2,477 to $3,497 installed in Delaware, or roughly $1.94 per square foot. DIY with rented equipment cuts that by 45–60%.

Is insulation cheaper to DIY in Delaware?

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 Delaware?

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 Delaware?

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 Delaware

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

As an Amazon Associate we earn from qualifying purchases. Product links on this page may earn us a commission at no extra cost to you.