Miami Miami Windows and Doors - KCG bring over 20 years of window and door installation experience. Having worked with several of the biggest companies and providers in Miami, we know what it takes to give you the best windows and doors at the best price. Our process has allowed us to deliver the highest quality product and installation while keeping prices affordable. Deliver the best impact windows and doors at the best price. All types of projects accepted, both standard and custom. Lifetime Guarantee on all products and installation.