England and Wales: before 1900
marketed sale
Solid brick, as built, no insulation (assumed)
Solid, no insulation (assumed)
Low energy lighting in 40% of fixed outlets
Pitched, 100 mm loft insulation
No system present: electric heaters assumed
No system present: electric immersion assumed
To be used only when there is no heating/hot-water system
Fully double glazed
double glazing installed before 2002
marketed sale
Solid brick, as built, no insulation (assumed)
Solid, insulated
Low energy lighting in 86% of fixed outlets
Pitched, 400+ mm loft insulation
Boiler and radiators, mains gas
From main system
mains gas (not community)
Room heaters, electric
Fully double glazed
double glazing, unknown install date
Programmer, TRVs and bypass