Gowercroft Joinery are pleased to announced that we have been shortlisted for the prestigious British Woodworking Federation Heritage Project of the Year awards. The renovation of an historic mews building into a highly energy efficient Passiv-Haus utilising our vacuum glazing Heritage windows and doors. This project shows that it is possible to have an authentic, traditional home which delivers modern day performance.
In this landmark heritage retrofit, Gowercroft’s Winston Sliding Sash windows was central to meeting both sustainability and conservation objectives.
Architects Prewett Bizley’s objectives required windows with superior thermal efficiency, longer life expectancy, plus a traditionally crafted timber aesthetic similar to the original ‘multi-pane’ windows in order to secure planning permission.
The energy efficiency of vacuum glazing was critical, providing an overall U value of 1,5 W/m2K. This next generation glass allows future windows to reach 1.2. The air tightness of the frames with Gowercroft’s excellent sealing system contributed to a very impressive air tightness resulting in close to 1 m3/m2hr at 50Pa, which is exceptional for a property like this.
The Mews House achieved a massive 82% measured reduction in the overall energy consumption (from 325 to 51kWhr/m2yr). Remarkably the current measured energy use is less than 2025 RIBA targets for new build houses.
A total of 16 Winston Sliding Sash windows of varying sizes were installed.
Read the full case study here: Mews House.
The winners will be announced at the British Woodworking Federation’s annual dinner on 25th November 2022 at the Kimpton Fitzroy London Hotel, 1-8 Russell Square, London, WC1B 5BE. Wish us luck!