Design. Build. Install. We Do It All. Were the Mid-Atlantics premier replacement windows company, and we want to put our decades of expertise to work for you. Our ability to manufacture, install and service our windows means you get a higher-quality product and a more convenient experience without paying the middleman markup. Thompson Creek? Window Company is the Mid-Atlantic regions premier home improvement replacement products company. We have been customizing and manufacturing replacement windows, doors, gutters, siding and roofing in the Mid-Atlantic region since 1980. We pride ourselves on offering a higher quality product and a superior experience, from design to installation to service. Thompson Creek product owners consistently praise the aesthetic appeal, ease of operation and quality of our products. We believe that remodeling is more than about just fixing a problem its about increasing home value and comfort. Were so sure youll love our products that we back everything up with a Thompson Creek? No-Hassle Warranty and Buyer Protection Guarantee.