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CSO statistical release, , 11am

Domestic Building Energy Ratings

Quarter 1 2020

Table A: BER Ratings by Period of Construction
% of row
Period of constructionEnergy rating 

7% increase in Domestic BER audits in January-March 2020

Figure 1: BERs by Period of Construction
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There were 20,995 Building Energy Rating (BER) audits reported in quarter one 2020 compared with 19,617 in January to March 2019 (see Table 1). This is an increase of 7% and could be due to factors such as an increase in new dwellings, updating of old BER certificates, and new renovation work.

Dwellings built in 2015-2020 were considerably more energy efficient than in earlier periods with 97% given an “A” rating compared with 35% in 2010-2014 and 1% in 2005-2009 (see Table A and Figure 1).

Dublin County had the highest combined “A” and “B” rating at 30% (see Table 4). Roscommon had the lowest proportion of combined “A” and “B” rating at 8%.

Dublin 18, with an average dwelling age of 18 years, had the highest proportion of combined “A” and “B” rating at 43% (see Table 5). The average age of dwellings in Dublin 15 that have had a BER audit done was 17 years, but the combined "A" and "B" rating was much lower at 30% than in Dublin 18. The highest proportion of combined “F” and “G” rating was 26% for Dublin 7.

Mains gas was the main space heating fuel used in 51% of the dwellings completed during 2015-2020 and with a BER audit. This was a substantial increase from 2000-2004 when 41% of dwellings with a BER audit used mains gas. There were contrasting trends for heating oil and electricity with 35% of 2000-2004 built dwellings using heating oil compared with 4% for dwellings built in 2015-2020. In contrast usage of electricity increased from 19% in 2000-2004 to 44% in 2015-2020 (see Table 9).

The average floor area of all dwellings with a BER audit was 112 square metres (see Table 11). This average size varied from 157 square metres for detached houses to 57 square metres for basement dwellings.

Table 14 examines dwellings that have had more than one BER audit carried out. In their earliest assessment only 7% of dwellings received either an “A” or “B” rating compared with 21% in their most recent assessment. In contrast, 19% of dwellings were rated “F” or "G" in their first BER assessment compared with only 4% in their latest BER assessment (see Table 14 and Figure 2).