Crystal was founded in 1990 by Martin Randall and is one of the UK’s leading manufacturers of PVC-U windows, doors and conservatories. All of our products are produced in our state-of-the-art manufacturing facility in Letchworth, Hertfordshire, to the highest quality standards at competitive prices. for over 25 years we have supplied products to the new build, refurbishment, home improvement and construction industries, and are committed to producing an unrivalled range of products and offering our customers the choices they need to win sales and make money.