Site Navigation

Home
About
Services
Testimonials
Contact
News
Info

Grieff's Exterior Service Co.

"Low Prices and Fast Service!"

About Us

Since 1992, Grieff's Exterior Services Co. in Pontiac, IL, has been a trusted provider of window replacement and new construction window services. We proudly serve Pontiac, Streator, Odell, Dwight, and the surrounding areas. Our specialties include seamless gutters, leaf protection, gutter guards, siding, roofs, and more. For all your exterior service needs, reach out to Grieff's Exterior Services Co. today.

Our Story

Grieff's Exterior Service Co. has been a trusted name in Pontiac, IL, for over 30 years, providing top-quality exterior services since 1992. As a family-owned and operated business, we pride ourselves on delivering exceptional craftsmanship and personalized attention to every project. Whether working on residential or commercial properties, we treat each job as if it were our own home, ensuring every detail is handled with care. With competitive prices, fast service, and a dedication to excellence, we’re committed to bringing your vision to life.

Our wide range of services includes professional window and door installation using trusted brands like ProVia. From replacement windows to new construction options, we offer solutions that enhance both the energy efficiency and aesthetic appeal of your property. For superior protection, we provide seamless gutters and downspouts, paired with advanced leaf protection systems like Gutter Shell, to safeguard your home from water damage. Our roofing installation services add an additional layer of defense, ensuring your property is well-protected.

We also specialize in durable vinyl siding, soffits, and fascia to upgrade your home’s exterior with long-lasting, visually appealing materials. Using trusted brands such as Mastic Ovation Siding, we ensure your investment stands the test of time. We can also use other brands if you prefer. Additionally, we offer entry and storm doors, garage entry doors, and a variety of other exterior enhancements designed to meet your specific needs.

What sets Grieff's Exterior Service Co. apart is our unwavering commitment to quality and customer satisfaction. As a small, family-run business, we understand the value of personalized service. Our attentive team takes the time to understand your needs, providing tailored solutions and treating every project with the care it deserves. We offer convenient appointment times, fast turnaround, and free estimates to make your experience seamless and hassle-free.

Our customers can expect friendly, professional service and high-quality results every time. By using premium products like ProVia doors and windows, we ensure that your home or business benefits from both functionality and style. Located in Pontiac, we proudly serve Pontiac and the surrounding areas, helping our community maintain and improve their properties.

If you’re looking for reliable, full-service exterior work, Grieff's Exterior Service Co. is here to help. From seamless gutters and leaf protection to roofing, siding, and windows, we provide everything you need to enhance your property. Contact us today for your free estimate and discover why our customers have trusted us since 1992. Let us bring your vision to life with the care and quality you deserve.

Areas Served

Livingston County, IL | Grundy County, IL | Odell, IL | Streator, IL | Morris, IL | Pontiac, IL | Dwight, IL | Forrest, IL | Fairbury, IL | Saunemin, IL | Cullom, IL | Flanagan, IL | Coal City, IL | Gardner, IL | Chenoa, IL | Ransom, IL | Lexington, IL

What We Offer

Our Specialties include:

Our Services include:

Our Brands include:

Our Products include:

Testimonials

On 7/13/2025 John Burns had this to say:
I'd gotten estimates from 3 other window suppliers before selecting Grieff's. Of the 4 Grieff's was the best value by far. Their sales staff (Kelsey) was knowledgeable, friendly and professional. All questions were clearly answered and I knew exactly what to expect in my estimate and installation. The installation crew arrived exactly when they said they would. They too were friendly, professional and efficient. There was minor disruption while they did the installation and the cleanup was thorough. The windows, sliding patio door and screens all operate perfectly and I expect to get long years of use out of them.

On 7/12/2025 Ruth Storm had this to say:
I was extremely pleased working with the Grieff folks, from the first visit to the office staff to the workers. Everyone was easy to work with, friendly, helpful, and kind. I would recommend this company highly to others. Testimonial written by Ruth Storm on this site.

On 7/4/2025 John Burns:South Wilmington had this to say:
I wish I'd have known about Grieff's a year earlier when I bought windows for the front of my house from another supplier. This year we got the windows for the back of the house and a sliding patio door from Grieff's and I couldn't be more satisfied. In requesting the quote Kelsey was friendly, professional and knew all aspects of the business. She thoroughly answered all questions and explained the different options. The Provia windows are just what we were looking for, sturdy, easy to operate and just the look we wanted. The installation crew were also friendly and professional, showing up at the time they said they'd be here. The worked efficiently with little mess and cleaned up everything when the job was done. They also gave us a "walk thru" to assure we knew how the openers and locks worked. In a nutshell, this was a superior product at a lower cost with no downside. I'd recommend Grieff's to anyone for windows, doors and siding. Testimonial written by John Burns:South Wilmington on this site.

On 7/4/2025 John Burns:South Wilmington had this to say:
I wish I'd have known about Grieff's a year earlier when I bought windows for the front of my house from another supplier. This year we got the windows for the back of the house and a sliding patio door from Grieff's and I couldn't be more satisfied. In requesting the quote Kelsey was friendly, professional and knew all aspects of the business. She thoroughly answered all questions and explained the different options. The Provia windows are just what we were looking for, sturdy, easy to operate and just the look we wanted. The installation crew were also friendly and professional, showing up at the time they said they'd be here. The worked efficiently with little mess and cleaned up everything when the job was done. They also gave us a "walk thru" to assure we knew how the openers and locks worked. In a nutshell, this was a superior product at a lower cost with no downside. I'd recommend Grieff's to anyone for windows, doors and siding. Testimonial written by John Burns:South Wilmington on this site.

On 6/28/2025 Williamsburg Terrace Condo Association had this to say:
The Grieff!s crew worked for 3 1/2 days in sweltering heat to put the new cobblestone gray shingles on our condos and storage buildings for us in June. Fantastic job fellows! Very professional and easy to work with. Very accommodating team too. Highly recommended! Reasonably priced too. Testimonial written by Williamsburg Terrace Condo Association on this site.

Contact Us

Grieff's Exterior Service Co.
800 W Howard St Pontiac, IL 61764
Phone: (815) 419-2859
Fax: (815) 419-2857
Email: grieffext@gmail.com

Located in Pontiac

Where To Find Us

Follow us on Google
Follow us on Facebook
Follow us on Yelp

Payment Types Accepted

Visa, MasterCard, American Express, Discover, Personal Checks, Debit Cards, Cash

Our Hours

Holiday Hours May Vary. Please Call For Details.

Monday: 7:00 AM - 4:00 PM
Tuesday: 7:00 AM - 4:00 PM
Wednesday: 7:00 AM - 4:00 PM
Thursday: 7:00 AM - 4:00 PM
Friday: 7:00 AM - 4:00 PM

News

🌴 Celebrate summer with upgrades that last! Grieff's Exterior Services Co. offers expert installation of gutters, leaf protection, entry doors, and roofing for both residential and commercial properties. 📆 Call today to schedule a future appointment and enjoy a stress-free summer while we handle the rest.

🌞 Summer's here! Optimize your home's comfort and protection with Grieff's Exterior Services Co. Our energy-efficient windows, gutter guards, and roofing solutions are designed to keep your home cool and secure. 📞 Book a future appointment now and enjoy peace of mind all season long!

🌞 Summer's here! Optimize your home's comfort and protection with Grieff's Exterior Services Co. Our energy-efficient windows, gutter guards, and roofing solutions are designed to keep your home cool and secure.
📞 Book a future appointment now and enjoy peace of mind all season long!
#SummerDays #WindowExperts #RoofingSolutions #EnergyEfficient

🌞 Prepare your home for summer with Grieff's Exterior Services Co.! From replacement windows and roofing to gutters and downspouts, we offer a wide range of services to fit your needs. Ensure your home stays beautiful and efficient with our expert installations. 📞 Call today to schedule a future appointment and get your free estimate!

Info

Provia
Gutters
Siding
Gutter Shell
Roofing Material
Financing

Legal

Terms of Use
Privacy Policy