BUILDING PERFORMANCE
Refurbishment Project 20 Lena Gardens, London, England
The challenge A Passivhaus retrofi t was planned for a Victorian mid-terrace house, acting as a case study for the development of high-performance urban refurbishment, focused on the challenges of working in conservation areas and solid-walled buildings. Number 20 Lena Gardens, which was
built in around 1870 in West London, was in need of a full refurbishment. With solid brick walls, it had a leaky structure, single glazing and signs of rot in the structural timber; internal fi nishes were in poor condition. As a pilot project for sustainable
retrofi t techniques, the decision was made to set clear goals for the project from the outset, with the chief focus on energy effi ciency. The goals were to: maximise the use of natural resources with the site’s limited footprint; ensure high levels of internal comfort; use Passivhaus design principles and
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certifi cation; use recycled and low impact materials wherever possible; and commission, monitoring and post- occupancy evaluation. Because the project was situated
within a West London conservation area, the outside of the building was to remain unchanged (with the exception of permitted developments).
The response A design approach was adopted, focusing on fabric energy consumption, tight project management and the integration of highly effi cient services. The on-site building team was trained in Passivhaus principles and fully engaged in the build process. Super-insulation of the building was achieved using a double-skin insulation strategy to provide U-values of 0.1 WmK on external walls and 0.3 W/mK on party walls. An unbroken airtight layer was achieved throughout the house by the
The building’s outstanding performance demonstrates that great things are possible if there is good design and workmanship
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March 2013 CIBSE Journal
23
2013 Winner
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