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.