UK EPC data on new buildings
DECC also publish EPC data on new build dwellings. Figure 1 shows that although there has been an increase in the number of EER A rated new builds, this rise has not been steady, and experienced a significant lull in 2012 and 2013.
Figure 1 Annual numbers of New build EPCS with EER ‘A’ rating in England and Wales DECC 2015 (DECC, 2015a)
A similar trend is observed when considering the % of new build properties build to an EER A rating. As shown in Figure 2 the annual percentage of homes built to achieve an A rating has not significantly breached 1% of all dwellings.
Figure 2 Annual percentage of new build EPCs with EER ‘A’ rating in England and Wales DECC 201510 (DECC, 2015a)
However if we compare the number of properties with an EIR rating of A we can see that many more projects have been built to achieve this CO2 based target (Figure 3). This is perhaps a reflection of a desire to mitigate the CO2 emissions of developments with less focus on overall energy costs and energy conservation.
Figure 3 Comparison of New build EPCs with EER and EIR ‘A’ rating in England and Wales (DECC, 2015a, DECC, 2015b)
Indeed when observing the percentage of properties built to an EER rating of A it can be seen that the market share of these properties was approaching 10% by 2013, although dropped off somewhat in 2014 (Figure 4).
Figure 4 Annual percentage of new build EPCs with EIR ‘A’ rating in England and Wales (DECC, 2015b)
Data from Voluntary standards
The Low Energy Buildings database & Superhomes
The Low Energy Buildings database (LEB) was initially set up by the AECB as a dissemination and education tool for the retrofit for the future programme. The database now also contains up to date figures on all UK Passivhaus and Enerphit projects along with the AECB Silver and Gold standards.
The AECB has developed this database as an education and dissemination tool, incorporating both the RFTF projects as well as new and refurbished domestic and non-domestic low energy buildings. TSB provided grant funding to support the development of the low energy buildings website http://www.lowenergybuildings.org.uk/.
The database indicates that there have been approximately 74 separate projects built to the Passivhaus and Enerphit standards to date, consisting of between 270-300 dwellings, of these only 8 dwellings have been built to the Enerphit standard.
The database indicates that there have been 16 AECB silver projects, with a total of 68 dwellings, with a mix of new build and residential, the database contains only one project built to AECB gold standard. As mentioned later in the series, only a small proportion of the Retrofit for the future projects, met the 80% CO2 reduction targets. 86 projects were awarded additional funding, resulting in over 100 homes being retrofitted. Figure 5 shows the range of CO2 performance improvements from the en RFTF project, along with other retrofit projects on the database.
Figure 5 Pre-development, modelled and measured CO2 emissions from the retrofit project (LEBD, 2015)
The pre-requisite for the Superhomes scheme is a 60% reduction in CO2 emissions, the Superhomes database contains over 200 properties, many of the projects exceeded this requirement; more information can be found at http://www.superhomes.org.uk.
DECC 2015a. NB1 – Number of New Dwelling Energy Performance Certificates lodged on the Register in England & Wales by Energy Efficiency Rating – in each Year/Quarter to 30/06/2015. London: Department of Energy and Climate Change.
DECC 2015b. NB2 – Number of New Dwelling Energy Performance Certificates lodged on the Register in England & Wales by Environmental Impact Rating – in each Year/Quarter to 31/03/2015. Department of Energy and Climate Chnage.
LEBD 2015. Post-development charts. Low Energy Building Database.