Granto Glass Block is family owned and operated. We have been servicing the Western New York area since 1992, and all glass block units are fabricated at our workshop in North Tonawanda. We not only make standard window sizes, but can also make custom sizes for any opening. We also make specialty items such as bars, tables, shower walls, etc. We are trustworthy, dependable, and treat your home like our own. We understand the importance of customer satisfaction, and make it our #1 goal. We service residential & commercial needs. We are also fully licensed and insured.