21 / 56
21
While the exact path to an extensive
upgrade of existing building stock is yet to
be determined, we can select a particular
scenario to illustrate the magnitude of the
task. The scenario requires:
• Minimal-Intervention Buildings: Retro-
commissioning 30% of existing
buildings – with the target of reducing
BSI consumption by 10%
• Full Intervention Buildings: Retro-
commission and retrofit 70% of existing
buildings – with the target of reducing
BSI consumption by 35% compared
to 2012 codes (55% enhancement
from an average commercial building
consumption in 2005)
0
50
100
150
200
250
300
350
35% Reduction
Average building in 2005
Minimal-Intervention Commercial Building
Full-Intervention Commercial Building
retrofitted to BEC 2012
Lighting system (40%)
Air-side system (30%)
Water-side system
(30%)
Chiller system (40%)
Lifts and escalators system (10%)
Other systems*
(25%)
55% Reduction
Building Services Installation EUI
[kWh/sqm]
Remark: Bracketed percentage refers to increase in efficiency to that specific system through equipment specifications and enhanced
controls/operation
*Other systems include: Centralised hot water, Pumping, Mechanical ventilation, etc.
Beyond BEC 2012