England and Wales: before 1900
marketed sale
Solid brick, as built, no insulation (assumed)
Suspended, no insulation (assumed)
Low energy lighting in 14% of fixed outlets
Pitched, no insulation (assumed)
No system present: electric heaters assumed
Gas instantaneous at point of use
To be used only when there is no heating/hot-water system
Single glazed
not defined
marketed sale
Sandstone or limestone, as built, no insulation (assumed)
Solid, insulated
Low energy lighting in all fixed outlets
Pitched, insulated (assumed)
Boiler and radiators, mains gas
From main system
mains gas (not community)
Partial double glazing
double glazing installed during or after 2002
Time and temperature zone control