As the house-building industry continues to make progress towards the 2016 zero carbon homes standard, evidence is emerging of a gap in energy performance and CO2 emissions between what is predicted during design and what is achieved by homes when complete.
This report reviews the evidence that supports the existence of a CO2 performance gap and explores its potential causes. It establishes that, contrary to some of the views expressed on the topic to date, there is no single cause. Instead the report identifies a multitude of possible causes and issues that may contribute, from the earliest stages of design through to post-construction checking. All of these issues need to be understood and dealt with if the CO2 performance gap is to be minimised.
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