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This high-performance window was originally designed and patented by David Marshall of Blairs in 1983 and is recognised throughout the industry for its unique characteristics; combining traditional aesthetics with modern functionality and technology.

The BDS is the ideal solution for architects and designers where façade retention is required. Whilst maintaining the historical look of the building, the BDS affords safe cleaning, high security and fire escape and complies with energy efficiency legislation within today’s stringent building standards.

For over 35 years now, the BDS has been used across the UK to solve the problem of traditional appearance versus modern high-performance construction methods. It is a distinctive feature in many prestigious buildings throughout the UK and is also an integral aspect of the outstanding Canada Life building dominating the Toronto Skyline.

The BDS is tested to the highest standards by independent test houses and is fully certified for air and water resistance as well as meeting Secure by Design criteria for both standard and fire escape versions.

Even with its superior performance, due to modern production methods, the BDS offers a cost-effective solution in relation to traditional sash and case windows. The result is outstanding value for money, a further benefit to our clients who may have to work within budgetary constraints in today’s economic climate.

To this day, David’s expertise ensures the ongoing development of the BDS guaranteeing it continues to pave the way at the high end of the timber window market.

Blairs is the UK’s leading brand of high-quality bespoke timber windows & doors providing the widest range of timber products, whether your property is listed or a modern, contemporary, building; Blairs has a style to suit you.

All Blairs windows are supplied with glazing as standard and their enhanced security PAS24 level certification, which meets the Secured by Design criteria means that your property enjoys both protection and energy efficiency.

At Blairs, the solutions provided deliver a seamless experience of expertise, from design and planning approval, through to manufacture, delivery and installation.