SmartInsulationCalculator

2026 cost data

Insulation Cost in St. Louis, MO (2026)

Insulation contractors in St. Louis, MO price close to the national average. Here is what attic, wall, crawlspace and spray foam work should cost in the St. Louis metro in 2026.

Insulation prices per square foot

Installed prices — material plus labor — adjusted for St. Louis, MO labor rates.

Job typeInstalled cost / sq ft1,500 sq ft attic
Attic blown-in fiberglass (R-49)$1.76$2,636
Attic blown-in cellulose (R-49)$1.61$2,423
Attic fiberglass batts (R-38)$1.52$2,280
Wall batts, open framing (R-15)$1.66$2,494
Wall dense-pack retrofit (drill & fill)$2.47$3,705
Crawlspace floor or wall insulation$1.99$2,993
Basement rigid foam + framing$2.94$4,418
Open-cell spray foam (3.5")$1.85$2,779
Closed-cell spray foam (2")$3.42$5,130
Old insulation removal & disposal$1.47$2,209

What whole jobs cost

Typical projectLocal price range
Attic top-up (1,500 sq ft)$1,425 – $2,470
Full attic removal + re-insulate$3,040 – $5,130
Whole-house wall retrofit (2,000 sq ft home)$3,990 – $7,410
Crawlspace encapsulation + insulation$3,610 – $8,550
Garage conversion insulation$855 – $2,090
Whole-home spray foam (new build)$7,125 – $15,200

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 St. Louis metro compares with the rest of Missouri.

Insulation cost in Missouri →

Insulation cost FAQs for St. Louis, MO

How much does attic insulation cost in St. Louis, MO?

A 1,500 sq ft attic blown to R-49 runs about $2,241 to $3,164 installed in St. Louis, MO, or roughly $1.76 per square foot. DIY with rented equipment cuts that by 45–60%.

Is insulation cheaper to DIY in St. Louis, MO?

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 St. Louis, MO?

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 St. Louis, MO?

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 St. Louis, MO

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.