Page 171 - Hong Kong Green School Guide
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Hong Kong Green Building Council
169
Appendix F
Appendix F
Indicative Cost for Green Features
Green Feature
Indicative Cost
Estimated Payback
Green Roof
$400 ~ $1000 / m
2
3 ~ 5 years (Roof on top of
air conditioned space)
Heat Shield Roof Coating $100 ~ $200 / m
2
10 ~ 15 years (Roof on top
of air conditioned space)
Pervious Paving on Grade $200 ~ $350 / m
2
Not Applicable
Double Glazing
$7,000 ~ $9,000 / m
2
3 ~ 6 years (Retrofit for air
conditional space)
Tinted Window Film $150 ~ $250 / m
2
4 ~ 6 years (Window for
air conditioned space)
Reflective Solar Film $200 ~ $300 / m
2
3 ~ 6 years (Window for
air conditional space)
Low-E Window Film $400 ~ $500 / m
2
2 ~ 6 years (Window for
air conditioned space)
Solar Tube & Heliostat
>$300,000 per unit
>20 years
Florescent Tube T8 to T5
Adapter
$80 ~ $100 / tube
1 ~ 3 years
LED Spot Light
$150 ~ $400 / fitting
2 ~ 4 years
Occupancy, Daylight
Sensor and Timer Control
$3,000 ~ $4,000 / unit
installation
3 ~ 6 years (Energy saving
from turning / dimming off
lighting)
Solar Hot Water System >$100K / installation
5 ~ 7 years
Wind Turbine
>$200K / wind turbine
>20 years
Flat-plate Photovoltaic
(PV) Panel
$6,000 ~ $7,500 / m
2
of
panel area
>20 years
Building Integrated
Photovoltaic Panel (BIPV)
>$10,000 / m
2
of panel
area
>20 years
