Post on 17-Dec-2015
SALIX HOMES RETROFIT STUDY
Alison BallTim Whitley
Study Aims
Viability of an innovative retrofit programme
Most effective low carbon technologies
Job and training opportunities
Behaviour change programme
Methodology for calculating SROI
Funding sources
Replication
Salix Homes Retrofit Study commissioned by GM Procure
Lighting
Fans + pumps
Hot water
Heating
Appliances +
cooking+
plug loads
Dwelling Emissions
Incl
ud
ed
in S
AP
Re
sults
No
t in
SA
P R
esu
lts
Methodology
• SAP calculations
– Government tool
• Results in kgCO2/m2
• Assumed Occupancy
• Doesn’t include appliances
Methodology
Properties chosen
Type of dwelling Property name Number of bedrooms Number of type in estate Decade built
Flat Sycamore court 1 873 1960
Flat Joule Close 1 50 1980
Mid Terrace Enville Road 2 28 1950
Flat Carmel Road 1 36 1970
Mid Terrace Shakespeare Road 2 120 1930
Mid Terrace National Drive 3 131 1970
End Terrace Regents square 4 10 1900
Properties chosen
Properties chosenCurrent Property Condition
0
10
20
30
40
50
60
Sycam
ore co
urt
Joule
Clos
e
Enville
Road
Carmel
Road
Shake
spea
re R
oad
National
Drive
Regent
s squ
are
Property name
Em
issi
on
rat
e (k
gC
O2/
m2y
ear)
• New boiler
• Double glazed
• Some roof insulation
• Natural Ventilation
• Leaky building
Re
sults
1 -
CO
2 r
edu
ctio
n
-15.00
-10.00
-5.00
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
% r
ed
uc
tio
n (
kg
CO
2/m
2/y
ea
r)
Houses
Flats
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
Solar Hot waterSystem
Photovoltaics Wind turbine Air to Air Heatpump
Local woodchipboiler
Communityheating (gas)
Communityheating
(biomass)
% r
ed
uc
tio
n (
kg
CO
2/m
2/y
ea
r) Houses
Flats
Re
sults
1 -
CO
2 r
edu
ctio
n
-150
-100
-50
0
50
100
150
200
250
Insulatewalls (U=0.5)
Insulatewalls (U=0.3)
Improvewindows(U=2.1)
Improvewindows(U=1.5)
Roof Uvalue
0.11w/m2k
Mech ventwith heatrecovery
(not app Q)
MVHR (appQ) (MR
XBOX 70)
Improveairtightness
(5m3/hm2@50Pa)
Improveairtightness
(3m3/hm2@50Pa)
Co
st
of
en
erg
y s
av
ed
(£
)
Houses
Flats
Re
sults
2 R
unn
ing
Cos
t Sa
vin
gs
-250
-200
-150
-100
-50
0
50
100
150
Solar Hot water System Photovoltaics Wind turbine Air to Air Heat pump Local Woodchip boiler*
Co
st
of
en
erg
y s
av
ed
(£
)
Houses
Flats
Re
sults
2 R
unn
ing
Cos
t Sa
vin
gs
0.00
5.00
10.00
15.00
20.00
25.00
Insulate walls(U=0.5)
Insulate walls(U=0.3)
Improve windows(U=2.1)
Improve windows(U=1.5)
Roof U value0.11w/m2k
MVHR app Q
£/k
g C
O2
sa
ve
d
Houses
Flats
Res
ults
3 –
Cap
ital c
ost p
er k
g C
arbo
n sa
ved
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
16.00
18.00
20.00
Solar Hot water System Photovoltaics Air to Air Heat pump Local woodchip boiler
£/k
gC
O2
Houses
FlatsR
esul
ts 3
– C
apita
l cos
t per
kg
Car
bon
save
d
0.00
20.00
40.00
60.00
80.00
100.00
120.00
Insulate walls(U=0.5)
Insulate walls(U=0.3)
Improve windows(U=2.1)
Improve windows(U=1.5)
Roof U value0.11w/m2k
MVHR app Q
£ i
nv
es
ted
pe
r £
en
erg
y s
av
ed
Houses
Flats
Res
ults
4 –
Cap
ital c
ost v
s. r
unni
ng c
ost
savi
ng
-125.00
-100.00
-75.00
-50.00
-25.00
0.00
25.00
50.00
75.00
100.00
Solar Hot water System Photovoltaics Air to Air Heat pump Local woodchip boiler
£ i
nv
es
ted
pe
r £
Ca
pit
al
Houses
Flats
Res
ults
4 –
Cap
ital c
ost v
s. r
unni
ng c
ost
savi
ng
• Flats
– Wall insulation– Roof insulation– MVHR systems
Results
• Houses
– Wall insulation– Roof insulation– Biomass – other issues– MVHR systems– NOT air source heat
pumps
Results
• Houses
• Decent homes standards typically 25% reduction
• Target 35% reduction in CO2 from Decent Homes standard
• Target £200 running cost saving
• Max 10:1 invest to save ratio
Targets
• Flats
• Decent homes standards typically 20% reduction
• Target 35% reduction in CO2 from Decent Homes standard
• Target £60 running cost saving
• Max 10:1 invest to save ratio
Targets
• GMP procure have a robust model• £1m turnover (labour) spend
delivers 2 training places• 126 trainees recruited to date• Access to real jobs in construction• Opportunity for unemployed
tenants
Job and Training Opportunities
Job and Training Opportunities
Decent Homes level
Description Job Years 6 months On site
12 months On site
2 years On site
1 Ventilation Bath and Kit Ass. electrics
29
58
29
14
2 Level 1 + Heating Doors Windows Roof Ins.
49
98
49
24
3 Level 2 + C. Wall Ins Dry Line Ins MVHR (replaces level 1 vent)
56
113
56
28
Possible jobs created
• Comprehensive approach• Tried and tested tools• Participation mechanisms• Reward and celebrate• Framework to build on
Tenant engagement and behaviour changeCurrent
• Tangible opportunity• Repeatable cycle• Awareness about benefits• Train tenants • Monitor change• Feedback findings • Key roles
Tenant engagement and behaviour changeOpportunities
• Gentoo Housing - Sunderland• Staffordshire Housing• Greenoak Housing – Surrey and
Sussex• Drum Housing - Hampshire• Places for People - Lancashire
Behaviour Change Case Studies
• Non economic impacts tool• New Economics Foundation• Wider benefit measurement - debt risk,
comfort level, health• Evaluative or forecast• Maximise capital investment benefits• SROI
– strategic planning tool – communication impact – attracting investment– evaluate social value
Social Return on Investment - SROI
• Robust methodology• Evidenced approach• Monitoring• Cross section of Salix dwellings• Representative for North West?
Replicability