England and Wales: 1900-1929
marketed sale
Cavity wall, as built, no insulation (assumed)
To unheated space,  no insulation (assumed)
Low energy lighting in 57% of fixed outlets
Pitched, no insulation
Boiler and radiators, mains gas
From main system, no cylinder thermostat
mains gas (not community)
Room heaters, mains gas
Single glazed
not defined
Programmer, TRVs and bypass
marketed sale
Cavity wall, as built, no insulation (assumed)
Suspended, no insulation (assumed)
Low energy lighting in 57% of fixed outlets
Pitched, 300+ mm loft insulation
Boiler and radiators, mains gas
From main system, no cylinder thermostat
mains gas (not community)
Room heaters, mains gas
Single glazed
not defined
Programmer, TRVs and bypass