Since 1984 family owned Certified Windows Wholesalers Inc. has been the premier vinyl window replacement installation company for Maryland, DC, and Virginia. If you have been considering the move to more energy-efficient, vinyl replacement windows we can improve your home’s look and feel while reducing your energy bills. Whether you are remodeling, renovating or building a new home, Certified Windows Wholesalers Inc. will deliver unmatched beauty, strength and energy savings. Our windows are custom-made to fit your current window openings precisely and you save money because unlike stock windows found at your local retailer, they require no additional wall construction.