GTS Windows and Doors does not sub-contract out the installations, unlike many of their competitors, especially the big box stores. Our qualified installers have been with us for over 15 years. Over 90% of everything GTS sells is installed. The majority of their business comes from residential homeowners wanting to upgrade or improve their home. Our clients want to deal with one company and one person that will look after everything for them. We need to remain diversified enough to make it a one stop shopping experience for the client. For this reason, GTS does not consider the big box stores competitors, as they can't offer the same service and supervision you get from a company that specializes in one area like GTS Windows and Doors.