The implications of widening walls must be considered when the decision has been taken to insert a greater thickness of insulation.

In the publication issued by the Zero Carbon Hub, ‘Defining a Fabric Energy Efficiency Standard for zero carbon homes’, the cost involved in increasing a wall cavity from 85mm to 210mm added an additional £2,570.00 to a typical semi-detached property.

Xtratherm commission a report by Cyril Sweet Construction and Property Consultancy, to analyse the costs of increasing cavities up to 200mm.

To download or register for the report please visit

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