We at Strong Windows carry only the finest and most energy efficient brands available in the world today, with U-Values on our double hungs as low as .15 . Our selection of premium brands including HiMark by Okna, Starmark, Softlite Elements, Gorell Windows and others allow us to fit you with the right window for the your individual window replacement situation. We can supply windows with a large variety of colors, wood-grains, special features such as blinds and shades between the glass or custom decorative glass. Have Strong Windows of Illinois quote your window, siding or door project today and see the difference individual attention and 35 years of window expertise can bring to your project.

Strong Windows utilizes only ‘best practices’ methods in it’s installations. Outdated methods using fiberglass insulation around window frames are still prevalent in many companies today, which still allow air leakage and do a poor job of insulating. We at Strong Windows use minimal expanding window & door foam to fill all voids around our windows, and we utilize drip caps integrated into the wall system instead of relying solely on caulking to waterproof the windows.

Our Services

Window Wrapping – The Art of Bending Rolled Aluminum to Cover the Existng Window Casings
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Custom Coloring – Custom coloring to Existng Window Casings


STARMARK is manufactured by OKNA windows; they offer a unique window system unlike any other in the industry.

STARMARK uses a cellular composite frame that has natural insulating abilities. Cellular composite frame system out performs both wood and solid vinyl window systems. Cellular composite windows are much stronger and generate better energy values. Read More>>

HiMARK WINDOW & Doors by Okna take great pride in building energy efficient windows and doors that add comfort and beauty to consumers’ homes. Our goal as engineers and designers is to use advanced technology available to manufacture windows and doors that exceed the highest standards.

The sophisticated technological innovations used to make our windows and doors energy efficient set the bar for other manufacturers and contribute to a bigger cause – protecting our environment. We already surpass not only the current requirements for the government’s Energy Star certification but also the requirements set to be implemented in 2012. By conserving energy, our windows and doors can drastically lower consumers’ heating and cooling bills each month. Read More>>

SOFT-LITE’s vinyl replacement windows, fiberglass entry doors and patio doors offer the best value in energy efficiency, durability and overall craftsmanship. Whether you are replacing a few vinyl windows or need a complete set of replacement windows and doors, let Soft-Lite show you how to turn your house into the dream home it was meant to be. Read More>>





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