Report comment

The windows in the project featured in this article are beautifully crafted timber conservation sash windows made by a well established English company called Mumford & Wood. These windows match the originals so well that it is almost impossible to identify them against the original leaky single glazed windows which are still in place in the house next door. The only significant difference is a 100% improvement in energy performance and a huge comfort improvement for the occupants who are now enjoying their draught free windows. We have also taken the opportunity to install even higher performance windows in the two larger openings on the rear façade, these windows are triple glazed timber windows made bespoke for this project by a Passivhaus window company.

The project also demonstrates that even with sash windows, when in collaboration with a high quality and highly skilled contractor, it is possible to achieve excellent air tightness results, this project achieved a result of 1.94 ACH-1 @50pa, approximately 5 times higher than the standard set for new build projects. Which is a great credit to Firmco’s site foreman Jamie Bartley and his whole site team.

Response from Project Architect, Sarah Lewis