Marlboro has been making quality windows and doors for more than 40 years. Located in Ottawa, Canada, our modern 40,000-square-foot manufacturing plant produces a full range of competitively priced custom-built vinyl, aluminum, hybrid windows and doors that will enhance the look of any home. A family-owned business now in its third generation, Marlboro’s commitment is to provide exceptional customer service and to make windows and doors that meet the highest standards of quality, design, durability and energy efficiency.