Sash Window Conservation

Regents Park, London

Posted on August 27, 2013.

Sash windows up to four metres in height have been conserved by Original Windows Ltd, a member of the British Woodworking Federation. As part of the Crown Estate the 1820’s Grade I listed residential house faces Regents Park in London and overlooks one of the Capital’s finest parks.

The sash window specialists based in Enfield, North London, carried out the work to more than 90 windows at Cumberland Place on behalf of Octagon Developments. Credited to John Nash (1752–1835), the architect whose name is synonymous with the royal park and its approaches, the buildings listed status and distinctive fenestration patterns demanded the greatest possible sensitivity and attention to detail. About 25 of the century old box frames were reproduced by Original Windows following exactly the glazing pattern and sections of those being replaced. Three of these windows had to be bowed to the curvature of the building.

All the sashes from the windows that could be saved were removed to their Enfield workshop for stripping and sanding while sections of new timber were spliced-in wherever this was necessary. Similar treatment was carried out to the existing box frames without removal from the building and the timberwork primed ready for finishing by decorators.

Original Windows obtained large quantities of crown glass rather than modern float glass for glazing all of the windows ensuring the essential irregularity of reflection and slight distortion of light that gives an authentic appearance. In order to offer the benefits of modern energy performance the BWF Member installed draught reducing brush seals at discreet positions along new timber parting beads and across the sash rails.

The Project Manager for Octagon Developments, Rob Stone, Comments: “This was a very demanding project, addressing a Grade I listed property that comes under the full requirements of the Crown Estate Specifications. The service provide by Original Windows was excellent and we are very pleased with their workmanship.”

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