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Kielstra Siding & Windows is a family-owned and operated business in St. Thomas, Ontario, providing reliable and professional installation of quality siding, eavestrough, windows, and doors. With over 60 years of experience, our knowledgeable staff and friendly installers ensure that your job is done right and on time. We offer a range of products and services for existing homes and new homes, including siding installation, eavestrough, energy-efficient windows, and entry door systems. Our goal is to provide outstanding value and exceptional customer service.