Insulation Cost in Decatur, IL in 2026
Most Insulation projects in Decatur, IL cost between $1,600 and $6,500. The typical price is $3,100.
Labour and materials in Decatur run about 12% above the national average. These figures are adjusted for that, so they are not the national average you will find elsewhere.
What drives the price
- Batt, blown-in cellulose or closed-cell spray foam
- Target R-value for your climate zone
- Attic, wall or crawlspace access
- Air sealing done alongside the insulation
Usually included
- Insulation material to the specified R-value
- Installation and air sealing at obvious gaps
- Cleanup and disposal
Usually extra
- Removing contaminated existing insulation
- Ventilation or moisture remediation
- Drywall work for wall injection
Unit prices in Decatur, IL
| Quality tier | Cost per sq ft |
|---|---|
| Budget | $1.30 |
| Mid-range | $2.59 |
| High-end | $5.40 |
Insulation contractors in Decatur, IL
Businesses listed on Google near Decatur, IL. We are not affiliated with them and do not vet them — always confirm licensing and insurance before hiring.
Assured Insulation
4.6(31 reviews)
1960 S Taylorville Rd, Decatur, IL 62521
Prairie Insulation
4.5(32 reviews)
3115 E Dotmar Dr, Springfield, IL 62703
Jones & Sullivan Enterprises, Inc.
4.8(25 reviews)
2955 N Dinneen St, Decatur, IL 62526
Ken Nichols Insulation
4.7(19 reviews)
962 IL-121, Sullivan, IL 61951
Apex Builders
No rating yet
Decatur, IL 62522
Envirofoam
4.8(4 reviews)
12051 Main St, Glenarm, IL 62536