The MARK Series Difference

Achieving Perfection

BIL-DEN professionals search the world over to bring back the finest components for MARK SERIES windows and doors. Skill and thought are put into each computerized design, to maximize energy savings features, to ensure security, and to take into consideration all the elements that windows are subject to from the inside out.

As with other quality vinyl windows, the Mark Series uses fusion-welding to enhance structural integrity. We take it one step further, though, with aluminum reinforcements integrated into windows for optimal strength. With no screws and surface glue, there is virtually no chance of air and water getting through; you're covered, for life. All Mark Series windows meet or exceed Ontario Hydro and CCMC standards.

Convenient Maintenance And Effortless Operation

Solid construction doesn't mean that you're going to have to struggle with your quality Mark Series windows, though. The sashes have a special counterbalancing system that lets you move them with your fingertips. The double-hung and side slider window both tilt in for easy cleaning and for emergency escape. Your safety is not compromised, trust us.