McCallum Aluminum Ltd. is one of London's longest-established exterior renovation companies, proudly serving homeowners throughout Southwestern Ontario since 1957. As a family-owned and operated business led by Brian Hollis, alongside Diane Hollis and Kyle Hollis, the company has built its reputation on honest advice, quality products, and skilled installation services. The company offers a comprehensive range of exterior home improvement services, including ENERGY STAR® certified replacement windows, steel and fiberglass entry door... read full review »