Evidence for a CO2 performance gap has been accumulating since 2007.
The closure of this gap has been given high priority in the run up to 2016 to help ensure that zero carbon homes meet design expectations.
This report reviews the evidence that supports the existence of a CO2 performance gap. It identifies a range of possible causes and issues that may contribute, from the earliest stages of design through to post-construction checking. The significance of these causes is under detailed evaluation in a programme of work being undertaken by the Zero Carbon Hub.
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