Combining cutting edge technology without losing the traditional authentic box sash character and style. The vertical slider has the strength and durability of the old timber box sash and incorporates all the classic features like Georgian bars, decorative horns and deep bottom rails. Not only do the sashes slide but they can also be tilted inwards for ease of cleaning and extra ventilation. Both top and bottom sashes can also be fully removed from the inside, ideal for maintenance, installation or access.

“Recently had new windows .new door with full arch .fachias.soffits. brilliant job done .fully professional work.very clean workers.would recommend highly.will not use any one else .very friendly and polite.perfection highly delighted.”



When you choose Sliding Sash windows you will benefit from:

A choice of the traditionalƒ and slimline Bevelled frame or the sleek, contemporary and curved Ovolo frame. ƒ

Full range of window styles available including Casement, Tilt & Turn, Vertical Slider and Reversible. ƒ

All window components are compatible with Bison’s full product range.

PCE concealed gaskets provide a superior seal for improved weathering protection.

Flush glazing provides improved Window Energy Ratings and an enhanced finish.

Cills available in sizes 85mm, 110mm, 150mm, 180mm & 225mm.

Bespoke design and planning service to cater for your individual needs.