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Does it pay-off to build green?. Future for energy efficient residential buildings: a study of developers on the housing market in Sweden ERES 2010. KTH Architecture and Built Environment Agnieszka Zalejska - Jonsson [email protected]. Energy consumption in buildings. 185. 156. - PowerPoint PPT Presentation
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Does it pay-off to build green?
Future for energy efficient residential buildings: a study of
developers on the housing market in Sweden
ERES 2010
KTH Architecture and Built Environment
Agnieszka Zalejska- [email protected]
Energy consumption in buildings
020406080
100120140160180200
Comparison of energy consumption in buildings, Sweden south
Building's operating electricity Hot water Heating
30
40 50 5570
110
156
185
Construction of dwellings in Sweden
1958
1960
1962
1964
1966
1968
1970
1972
1974
1976
1978
1980
1982
1984
1986
1988
1990
1992
1994
1996
1998
2000
2002
2004
2006
2008
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
Number of completed dwellings in Sweden 1991-2009
One or two dwelling buildning
multi-dwellings buildings
passive house
Source: Statistics Sweden (SBC) and passivhuscentrum.se
Passive and low energy houses in Sweden
Source: passivhuscentrum.se
The study
Housing developers (clients) view on investment cost, energy efficiency, profitability and future development of green residential buildings
Survey sent in February and March 2010
Respondents
Survey distributed to: 99 persons 36 housing companies
Addressed to:Project leaders, executives, environment and development chief advisors
Responded: 34 persons (37%)
17 private 17 public
24 companies (67%)
What have we asked about?
Environmental goals
Experience in building energy efficient multi-family buildings
Cost and benefits of energy efficient measures
Future plans and view on green construction
energy demand environmental friendly material
energy source CO2 emissions other
100%
81%
53%47%
16%
Company environmental goals for residential buildings construction
Environmental goals
very good insulation and airtight building's envelope
very low energy demand
renewable energy source
minimum CO2 emission
environmental friendly material
lite or no demand for heating system
other
0% 10% 20% 30% 40% 50% 60% 70%
Importance of individual aspects of green buildings
absolutely conclusive very important but not conclusive important but not significant
Environmental goals
Total investment costTotal investment cost for green buildings in comparison with traditional residential buildings• 20% - Difference insignificant• 30% - Higher cost , less 5%• 40% - Higher cost , between 5%-10%
administration and fees
design construction material
installations labour0%
10%20%30%40%50%60%70%80%
Difference between cost types in green residential buildings in comparison to traditional residential buildings
higher cost (about 10%) no or insignificant cost difference lower cost (about 10%)
Labour
9%
42%
48%
"Risk for mistakes in construction process is higher in green build-
ings"
fully agree partly agree disagree
Labour expenses are 10% higher for green buildings
There is need for higher quality works in green buildings (75%)
Need for higher accuracy and knowledge
36%
55%
9%
"Green projects demand generally higher quality of
material and products"
fully agree partly agree disagree
• Material costs 10% more in green building construction than in traditional project
• Most expensive components: • Insulation• windows • ventilation
• Most profitable energy measures:
• good insulation• mechanical heat recovery system• air tight building
Material
Operation and Maintenance
15%
45%
24%
15%
"We estimate that green buildings require less
maitenance in the future"
fully agree partly agree disagreedon't know
Operation cost are expected to decrease at least 20%
Reaching designed energy efficiency may require certain amount of technical adjustments
Green buildings may be greater challenge for property management companies
up till 60 kWh/m2 60-50kWh/m2 50-40kWh/m2 40 kWh/m2 there is no limit0%
5%
10%
15%
20%
25%
30%
35%
Level of energy demand (exclusive domestic electricity) where energy saving measures are profitable
Energy efficiency and Profitability
Future plans
low energy house (under 70 kWh/m2)
low energy house (under 55 kWh/m2)
passive house zero energy house
plus house other0%
10%
20%
30%
40%
50%
60%
70%
Types of green building project residential developers are considering to build
Future plans• 90% respondents absolutely is going to build green in the future,
remain 10% consider green plans
• Only 10% thinks that industry is ready to deliver green buildings (with quality and accuracy that is needed)
• Almost 85% practitioners plan to build green residential buildings because it is a good business opportunity
• 60% plan to build green because it is strengthening company position
• Only 40% base plans to build green buildings on requirement from regional construction municipalities
Growth of green construction
price decrease of environmental friendly materials and products
development of construction technologies and building concepts
industrialization of construction process
standarization of construction components
0% 10% 20% 30% 40% 50% 60%
Factors potentially affecting development growth of green building construction
absolutely conclusive
very important but not con-clusive
important but not significant
not significant
1. Technology development2. Knowledge3. Scale of production
Growth of green construction
financial stimulants (eg. tax reduction or subsidiaries)
substantial increase of energy prices
strenghten constraction standards
obligatory environmental assessment & certificat
0% 10% 20% 30% 40% 50% 60%
Factors potentially affecting development growth of green building construction
absolutely conclusive
very impor-tant but not conclusive
important but not significant
not signif -icant
1. Financial incitements for practitioners 2. No need for obligatory certification
Summary
Green residential buildings more are expensive than traditional - approx. 6%
Critical components: Insulation Airtight building’s envelope Mechanical heat recovery system
Building green is a good business
What the tenants think?