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Grieff's Exterior Service Co.

"Low Prices and Fast Service!"

About Us

Grieff’s Exterior Services Co. in Pontiac, IL has been a trusted name in exterior home improvement since 1992. Proudly serving Pontiac, Streator, Odell, Dwight, and surrounding communities, we specialize in window replacement and new construction windows, along with seamless gutters, gutter guards, siding, roofing, and more. Count on our experienced team for quality workmanship, reliable service, and exterior solutions that enhance and protect your home.

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 6/17/2026 Dawn Boitnott (NWT POP UP SHOP) had this to say:
They ALWAYS do the best work around! Love our new windows and love their work! Guys were efficient, friendly and did excellent clean up!! Highly Recommend!!*****

On 6/17/2026 Karen Munz had this to say:
Grieff's Exterior Services installed two large windows for me. They arrived when they said they would, installed the new windows, cleaned up everything, and answered any questions I had about the windows. Both men were pleasant to talk to and knew a lot about windows. I would recommend Grieff's if you need new windows or gutters. They did my gutters a couple of years ago. Testimonial written by Karen Munz on this site.

On 6/17/2026 Blanca Schuler had this to say:
We had a few windows and a door installed by Grieff’s and they did an excellent job, as always! We have worked with them in the past and they are always super professional, very efficient, and the clean up is top notch! Kelsie in the office is also super helpful in answering any questions we had. An amazing team all around! Next up is our roof which we are on the books to get done in the next couple months. Would recommend them 100%. Do not hesitate to call them up!!

On 6/1/2026 Charles Finedore had this to say:
Great service provided. Very friendly. Crew was here on time every single day. All of the crew was very helpful. They cleaned up after themselves at the end of the day. They performed the whole job as if it was their own home. I was very impressed with the craftsmanship of the crew. Job was to install all new siding, windows, gutters, soffit and facia. Testimonial written by Charles Finedore on this site.

On 5/23/2026 terra folk had this to say:
The entire process was great. When the guys came to put windows and doors in, they were exactly what we ordered. They spent two days installing everything and were very professional and efficient

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

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Payment Types Accepted

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

Our Hours

Holiday Hours May Vary. Please Call For Details.

Monday: 7:30 AM - 4:00 PM
Tuesday: 7:30 AM - 4:00 PM
Wednesday: 7:30 AM - 4:00 PM
Thursday: 7:30 AM - 4:00 PM
Friday: 7:30 AM - 4:00 PM

Info

Provia
Gutters
Siding
Gutter Shell
Residential Roofing
Malarkey Roofing

FAQ

What services does Grieff's Exterior Service Co. offer?
We specialize in a wide range of exterior services including:

Window replacement and new construction windows
Seamless gutters and gutter guards
Leaf protection systems
Siding installation
Roofing services
We proudly use trusted brands like ProVia and Gutter Shell to ensure quality and durability.
What areas do you serve?
We serve Pontiac, Streator, Odell, Dwight, and surrounding communities in Illinois. If you're unsure whether you're in our service area, feel free to contact us directly.
How long has Grieff's Exterior been in business?
We’ve been a trusted name in exterior services since 1992, delivering reliable craftsmanship and fast service for over 30 years.

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