1. Green Buildings – Delivered!
Dr Kerry J Mashford, Chief Executive,
National Energy Foundation
GreenBuild Expo – 8th
& 9th
May 2013
Improving the use of
energy in buildings

2. “In theory, theory and practice are the same……
…..in practice, they aren’t”
Green Buildings – Delivered!

3. Building often don’t perform as expected –
design isn’t reality
Source : Bill Bordass based on data from Better Buildings Partnership

4. Where does the performance gap
come from?

5. How does the performance gap arise?

6. What causes the gaps?
• Technology Strategy Board has commissioned
over 100 study projects on:
 New-build domestic
(comprising 366 dwellings within developments totalling 3989 dwellings)
 New-build + refurbished non-domestic
– 51 studies
• Case studies – specific root causes and how to
avoid them
• Body of evidence revealing common issues

7. Outputs from Technology Strategy
Board BPE programme
Emerging themes
•Commissioning
•Sub-meters and reconciliation
•BMS
•Controls / complexity
•Lighting – too much and inability to control
•Fabric performance
•MVHR systems
Credit: Technology Strategy Board

8. Building Performance Evaluation -
measuring performance

9. Benchmark – compare using
TM46/CarbonBuzz
• The graphs represent the median CO2 emissions for design and
actual CarbonBuzz records sector-by-sector on a scale of 0-200
kgCO2/m2/yr. The figures below each column represent the
number of records per sector. The performance gap tends to be
around 150-200% where the number of records are statistically
significant, such as schools and offices.

10. Ensure your building is not only
designed green but delivered green
Save costs, energy and carbon
Improve comfort

11. www.nef.org.uk
kerry.mashford@nef.org.uk
Improving the use of energy in
buildings