The lighting was almost entirely halogen spot lamps so this assumes just 9 lumens per watt whereas T5 fluorescents have a default of 45.
If the manufacturer’s specification is available this can be improved further. Up to 80% of the energy used produces heat not light in halogen and tungsten lamps. If air-conditioning is installed the EPC rating is hit twice as the poor lighting adds to the cooling load.
The client then refurbished the building and installed heat pumps and LED lighting and the EPC rating improved to 65C which is well within the Minimum Energy Performance Standards which comes into effect for non-domestic buildings in April 2018
A firm of west end surveyors who we have worked with for many years are advising a pension fund on their property portfolio. UK Energy Surveys were commissioned to go through their portfolio of 53 properties throughout the UK so that they could trade the individual lots at any time if required. Some buildings already had EPCs and we were asked to look at the poorly rated properties to see how they could be improved to E or better.
An EPC had been carried out on this building in 2008 by another company and at the time it achieved 126 (F)
Since then some of the heating, cooling and lighting has been improved and we were able to get the rating up 45 points to 81 (D)