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WHOLE LIFE COSTING OF A FRENCH SINGLE FAMILY HOUSE REFURBISHMENT : THE BAT
ECO2 CASE STUDYCarolina DA ROCHA COLLI - PhD Student (3rd year)
Alain BATAILLE – PhD Associate ProfessorEmmanuel ANTCZAK – Professor
CONTEXT
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Call to Regional Projects – November 2014 « Life Cycle Assessment and New
Economical Models »
Bat eco2Environmental and Economical Strategy
through building eco-efficiency
CONTEXT
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65%
35%
French Building Stock (30 million dwellings)
Before 1975 After 1975
Average energy consumption of 300 kWhPE/m2.yr
Building Sector : 20% of GHG emission in France
Energetic transition for green development French law à Decrease in 75% GHG between 1990 and 2050.
PROJECT APPROACH
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Environmental & EconomicalIndicators
Simplified tool for decisionmaking
Case study LCA & WLC
PROJECT GOAL
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Compute economical results along life cycle
Tool economical specifications
Sensitivity analysis
Life cycle period of analysis : 50 years
THE CASE STUDY & WLC PARAMETERS
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Construction
Operation
Maintenance
End of life
ISO 15686-5
~59 m2!"#$ = &
'()
* +'1 + . '
Reference year : 2016
PROJECT WLC PARAMETERS
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Real Value or Nominal Value
Discount Rate :
Replacements Maintenances Property tax Rent
RELATIVE NET PRESENT VALUE
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Initial Investment Share
SENSITIVITY: PERIOD OF ANALYSIS
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SENSITIVITY: LOAN PERIOD & LOAN RATE
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-300%
-200%
-100%
0%
100%
200%
0 5 10 15 20 25 30 35 40 45 5020 years / 2,00 %15 years / 4,10 %20 years / 4,10 %25 years / 4,10 %20 years / 6,00 %
SENSITIVITY: OTHER RATES
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SENSITIVITY: UNPAID RATE AND VACANCY RATE
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VARIATION DUE TO +/- 0,5% ON RATESARE +/- 5% ON NET PRESENT VALUE
THERE IS A LITTLE DIFFERENCE IN PAYBACKTIME (LESS THAN 1 YR)
CONCLUSIONS
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Hotspotsü Refurbishment Investment
qStructureqFaçadeqPlasteringqExteriorqDemolition
ü Rent
ü Replacements and Property Tax
Sensitivity Results
ü Best Period of Analysis : 80 years
ü Loan discount rate decrease by 2%achieves 180% of reference NPV
üMost important NPV variation dueto rent rates
PERSPECTIVES
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First version of a simplified tool:
q LCA and WLC results crossed
q Eco-efficiency
Ready for the associated social landlordnext November
THANK YOU!
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Contacts :[email protected]
[email protected]é d’Artois - LGCgE
Pôle Béthune