Crystal has its own sealed unit production facility producing around 1800 units every week. In 2009, Crystal began producing units for its new range of energy efficient windows with A and C WER ratings. Glass is also a popular way for homeowners to individualise their properties. That’s why we offer our customers a comprehensive choice of glazing options including stained, bevelled and leaded units. All Crystal glazing products conform to the BS EN 1279 industry standard.