You take pride in your home, and naturally you want the best, most reliable windows and doors available. Grentz Contracting has been installing windows in the Chester County area for more than 10 years.


Unlike some of our competitors, we will never claim to install an entire housefull of windows in a day. Instead, we pull the entire window and frame out from the wall, replace any rotted or insect damaged wood. Then we wrap the entire opening with a waterproof window wrap, make sure the window is perfectly centered, leveled, and square to properly ensure its performance and insulation qualities. By taking these extra measures our installation times are slightly longer, but we promise you will be more than satisfied.

When we are finished installing the windows, we instal new PVCl brick mouldings or PVC flat stock around the exterior of each window and door. On the interiors we first foam out the windows for superior insulating value, then add new jambs (if not included with the window), new sills, and new window mouldings. Finally, all the interior surfaces receive two coats of paint for a look that makes people think that the windows have been there since day one.


Our attention to detail and commitment to customer service is second to none. We offer a full line of wood and vinyl widows with several glass and trim options. Choose from double hung, picture, awning, casement, bay, bow, garden, sliders, as well as several designer shapes. We only deal with windows that are fabricated by established companies and come with a full, written warranty.

Window & Door gallery

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Sliding Barn Style Doors


Andersen A-Series with Versatex Trim


Custom built windows


Entry, Patio, and Storm Doors