Mainstream Home Improvement has been providing homeowners in Illinois -- specifically the Quad Cities: Moline, Rock Island, Davenport, and Bettendorf -- and Iowa with excellent customer service, quality products and quality installation for all there home improvement projects since 2001. Specializing in windows, doors, siding, gutter covers, roofing and attic insulation, Mainstream cannot only meet your home improvement needs but will deliver an experience that is second to none.