A performance gap is a disparity that is found between the energy use predicted and carbon emissions in the design stage of buildings and the energy use of those buildings in operation. Research in the UK suggests that actual carbon emissions from new homes can be 2.5 times the design estimates, on average.[1] For non-domestic buildings, the gap is even higher - actual carbon emissions as much as 3.8 times the design estimates, on average.[2]
There are established tools for reducing the performance gap, by reviewing project objectives, outline and detailed design drawings, design calculations, implementation of designs on site, and post-occupancy evaluation. NEF's Assured Performance Process (APP) is one such tool, which is being used extensively on different sites that form part of East Hampshire's Whitehill and Bordon new town development, one of the largest regeneration projects anywhere in the UK, with high ambitions for both environmental performance and health.
^Palmer, J; Godoy-Shimizu, D; Tilson, A; Mawditt, I. 2016. Building Performance Evaluation Programme: Findings from domestic projects - Making reality match design. London: Innovate UK. Page 18
^Palmer, J; Terry, N; Armitage, P. 2016. Building Performance Evaluation Programme: Findings from non-domestic projects - Getting the best from buildings. London: Innovate UK. Page 12
A performancegap is a disparity that is found between the energy use predicted and carbon emissions in the design stage of buildings and the energy use...
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