To raise public awareness of energy use, the EU Buildings Performance Directive has been introduced. This requires all public buildings over 1000 m2 to display an energy label known as a Display Energy Certificate (DEC).
A DEC shows the energy performance of a building based on actual metered energy consumption over a period of 12 months. The Operational Rating (OR) is a numerical indicator of the annual carbon dioxide emissions from the building and a rating of 100 is the average.
This rating is shown on a scale from A to G, where A is the lowest CO2 emissions (best) and G is the highest CO2 emissions (worst). A DEC is valid for one year and is updated annually.
Ratings for UEL Buildings
| Campus | Building | 2008 | 2009 | 2010 | 2011 |
| OR | OR | OR | OR | ||
| DL | Ailsa House | 73 | 67 | 71 | 73 |
| DL | Architecture & Visual Arts | 91 | 73 | 72 | 72 |
| ST | Arthur Edwards Building | 121 | 112 | 94 | 89 |
| DL | Business School | 97 | 82 | 84 | 83 |
| ST | Centre for Clinical Education | 83 | 57 | 32 | 27 |
| DL | Clare House | 83 | 72 | 74 | 73 |
| ST | Conference & Computer Centre | n/a | n/a | 121 | 95 |
| ST | Duncan House | 195 | 187 | 180 | 180 |
| DL | East Building | 120 | 106 | 115 | 97 |
| DL | Felix House | 64 | 75 | 73 | 71 |
| DL | Jamilah House | 95 | 90 | 89 | 92 |
| ST | John Cass School of Education & Communities | n/a | n/a | 87 | 66 |
| DL | Knowledge Dock | 97 | 82 | 85 | 83 |
| DL | Kwame House | 102 | 92 | 90 | 88 |
| DL | Longbridge House | 55 | 999 | 46 | 50 |
| DL | Marley House | 55 | 999 | 47 | 51 |
| DL | North Building | 86 | 70 | 70 | 66 |
| ST | R Building | 65 | 45 | 50 | 90 |
| DL | Redbridge House | 55 | 999 | 47 | 51 |
| DL | Shepherd House | 55 | 999 | 51 | 55 |
| DL | Templars House | 55 | 999 | 51 | 55 |
| ST | University House | 110 | 83 | 74 | 68 |
| DL | West Building | 88 | 76 | 76 | 69 |
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