The following data has been estimated by combining the 2005 English House Condition Survey data with Ofgem’s data for the number of loft insulations carried out under the Energy Efficiency Commitment 2005-08. For Great Britain, the estimated proportions are as follows:
Loft insulation thickness Percentage of stock in 2008 None 3.60 less than 50 mm 2.85 50 mm up to 99 mm 21.76 100 mm up to 149 mm 34.80 150 mm up to 199 mm 11.95 200 mm or more 25.04 Total 100.00
Around 71 per cent. of homes in Great Britain have between 0 mm and 200 mm of insulation. The English House Conditions Survey and its equivalents in Scotland and Wales do not provide data on the number of homes with insulation depths between 200 mm and 250 mm, or on the number with more than 250 mm.
The insulation sector domestic market size is projected to increase by 32 per cent. by 2012 compared with 2007, reaching £1,109 million in 2012 (at 2007 prices).