§ Mr. Raynsfordasked the Secretary of State for Energy what is his latest estimate of the number of homes in Great Britain which are inadequately insulated; and what would be the total cost of ensuring that they are all fully and properly insulated.
Mr. HuntThe latest estimates of the information requested are:
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Type of insulation Definition of adequate1 level Number of inadequately insulated homes2 in Great Britain million Cost of insulating each home3 £ Total cost4 £ million 2. Loft insulation 100 mm in homes with access to loft 9.7 90 900 3. Draughtproofing Insulation at least in main rooms 12.5 60 750 4. Cavity wall insulation Insulation in homes with cavity walls 10.6 300 3,200 Total 5n.a. — 5,000 1Adequate insulation is taken to be the amount of insulation that, on average, is cost-effective to instal in existing homes. The standard of loft insulation is the mandatory requirement under the Building Regulations for new homes. 2Source: Audits of Great Britain Ltd. survey for December 1985. 3Source: Department of Energy estimates. The cost estimates for measures 1–3 exclude labour; that for 4 includes labour. 4The total cost estimates are rounded. 5The available data do not indicate how many dwellings lack at least one of these measures.