Certified Window Company

Certified Window Company is a Chicago-based window installation service and window supplier that also specializes in aluminum window options and serves as a dependable door supplier. Book an in-home assessment to get exact measurements, review energy-efficient choices (Low-E coatings, argon-filled glass, double or triple pane), and compare aluminum versus vinyl frames for Chicago’s climate. Ask about brands carried, lead times, warranties on glass, frames, and labor, and whether they handle permits, old window/door disposal, and post-install cleanup. Request a written, itemized quote with any financing or seasonal promotions, and schedule installation during a favorable weather window to minimize disruption.