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Illinois Valley Insulation

"The only full time full service insulation contractor in North Central Illinois"

About Us

Illinois Valley Insulation, located in Princeton, IL, has been a trusted leader in insulation services since 1988. Proudly holding an A+ rating from the Better Business Bureau, we are dedicated to delivering exceptional craftsmanship and customer care throughout Spring Valley, Ottawa, DeKalb, Rockford, Peru, and the surrounding areas.

Whether you are building a new home, remodeling an existing property, or upgrading for better energy efficiency, our experienced team provides comprehensive insulation solutions tailored to your needs. We specialize in spray foam insulation, which offers superior air sealing and energy efficiency; blown fiberglass insulation, perfect for attics and hard-to-reach spaces; and cellulose insulation, an eco-friendly option that delivers excellent thermal performance.

At Illinois Valley Insulation, our goal is more than just installing insulation. We focus on improving comfort, reducing energy costs, and protecting your home or business for years to come. Our attention to detail, use of high-quality materials, and commitment to customer satisfaction have earned us a reputation as one of the most reliable insulation contractors in the region.

For professional insulation services you can trust, contact Illinois Valley Insulation in Princeton today and let us help make your property more comfortable, energy-efficient, and well-protected.

Areas Served

Our Certifications

A+ Rating With BBB

What We Offer

Our Specialties include:

Residential and Commercial Services
Cellulose- Eco Friendly
Chimney Cleaning
Attic Insulation

Our Services include:

Spray Foam Insulation
Air Sealing
Blown Insulation
Sidewall Insulation
Crawl Space Insulation
Home Energy Audits
Duct Cleaning
New Home Construction
Vacuum Insulation
Insulation Removal
Box Sill Insulation
Thermal Imaging
Chimney Cleaning
Sound Insulation
Sound Proofing
Blower Door Testing
Insulation For New Homes

Testimonials

On 12/7/2025 Anonymous had this to say:
Illinois Valley Insulation did a great job with my home. They were thorough and really took the time to do the job well and were good at communicating too. Testimonial submitted anonymously directly to this site.

On 10/29/2025 Ron J had this to say:
Found Scott's business on the internet. He was quick to respond and to come look at my attic. Scott did a great job explaining how they would proceed. He called the day before and arrived on time. Didn't take long to set up or to finish the job. They did a great job of cleaning up. Everything your looking for from a contractor Testimonial written by Ron J on this site.

On 10/23/2025 Donna had this to say:
Scottie an excellent job of cleaning my wood stove out and chimney sweeping last week just in the nick of time for this cold spell we are having! Testimonial written by Donna on this site.

On 3/5/2025 Anonymous had this to say:
They did a great job putting insulation in our attic! Very friendly and respectful of our space, quick and straightforward with everything! Testimonial submitted anonymously directly to this site.

On 1/22/2025 Dave White W. had this to say:
We're having our chimney cleaned, and they are very knowledgeable and I believe will do a good job. they're careful not to make any messes. I'm impressed how the job is done from the bottom of the chimney up.

Contact Us

Illinois Valley Insulation
Princeton, IL 61356
Phone: (815) 875-1901

Where To Find Us

Our Hours

Holiday Hours May Vary. Please Call For Details.

Monday: 7:00 AM - 6:00 PM
Tuesday: 7:00 AM - 6:00 PM
Wednesday: 7:00 AM - 6:00 PM
Thursday: 7:00 AM - 6:00 PM
Friday: 7:00 AM - 6:00 PM
Saturday: By Appointment Only
Sunday: By Appointment Only

Info

Air Duct
Air Sealing
Blown
Sidewall
Crawl Space
Energy Audit
New Home
Chimney
Spray Foam