England and Wales: before 1900
marketed sale
Solid brick, as built, no insulation (assumed)
Solid, no insulation (assumed)
Low energy lighting in 25% of fixed outlets
Pitched, no insulation (assumed)
Room heaters, mains gas
Gas multipoint
mains gas (not community)
Full secondary glazing
secondary glazing
Appliance thermostats
marketed sale
Solid brick, with internal insulation
Solid, insulated
Low energy lighting in all fixed outlets
Pitched, 400+ mm loft insulation
Boiler and radiators, mains gas
From main system
mains gas (not community)
Fully double glazed
double glazing installed during or after 2002
Programmer, room thermostat and TRVs