0
10
20
30
40
50
Overall mediumnon-domestic
Overalldomestic
Mediumnon-domestic
electricity
Mediumnon-domestic
gas
Domesticelectricity
Domesticgas
% in
crea
se
Percentage cost increase by 2020
%
0
5
10
15
20
25
1976 onward1960-19751939-19591918-1938pre 1918
Age distribution of UK housing stock in 2006
0
50
100
150
200
250
300
Predicted heat lossMeasured heat loss
semisemidetacheddetacheddetacheddetachedend terraceend terracesemidetachedsemisemiend terraceend terraceend terracemid terracemid terracemid terrace
Hea
t los
s (W
IK)
0
50
100
150
200
250
Predicted heat lossMeasured heat loss
semi
semi
detach
ed
detach
ed
detach
ed
detach
ed
end te
rrace
end te
rrace
semi
detach
edse
mise
mi
end te
rrace
end te
rrace
end te
rrace
mid terra
ce
mid terra
ce
mid terra
ce
0
50
100
150
200
250
300
sem
ise
mi
detach
ed
detach
ed
detach
ed
detach
ed
end terra
ce
end terra
cese
mi
detach
edse
mi
sem
i
end terra
ce
end terra
ce
end terra
ce
mid te
rrace
mid te
rrace
mid te
rrace
Hea
t los
s (W
IK)
Whole house heat loss – measured versus predicted for new build UK dwellings (n=18)
0
50
100
150
200
250
semi
semi
detach
ed
detach
ed
detach
ed
detach
ed
end te
rrace
end te
rrace
semi
detach
edse
mise
mi
end te
rrace
end te
rrace
end te
rrace
mid terra
ce
mid terra
ce
mid terra
ce
Dis
crep
ancy
Mea
sure
d in
Pre
dict
ed (%
)
Discrepancy in measured versus predicted mean U-value for new UK housing (n=18)
Red
uctio
n in
hea
t los
s co
effic
ient
(W/K
)
0
30
60
90
120
150
MeasuredPredicted
Stage 2 renovationsStage 1 renovations