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