Leading window and door manufacturer Bison Frames has doubled the size of its production facility, to keep pace with demand for its popular Genesis Collection PVC-U and aluminium windows and doors. Well-known throughout the industry for Genesis VS vertical sliders, more recently the Barnsley-based fabricator has used its knowledge and experience of specialist window fabrication to extend its range into the Genesis Collection. The collection of high-end windows and doors includes PVC-U vertical sliders, flush casements, patio doors and bi-folds, and WarmCore aluminium windows and doors. As a result, demand has grown to a point at which bigger premises were required. Bison co-Director Mark Tetley explains: “As the market moved towards higher-end, premium products, we found ourselves in.