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CSO statistical release, , 11am

Domestic Building Energy Ratings

Quarter 1 2019

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

42% of Dwellings in Dublin 18 rated "A" or "B"

Figure 1: BER Ratings by Period of Construction
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Dublin 18, with an average dwelling age of 17 years, had the highest proportion of combined “A” and “B” rating at 42% (see Table 5). The average age of dwellings in Dublin 15 that have had a BER audit done was also 17 years, but the combined "A" and "B" rating was much lower at 29% than in Dublin 18. The highest proportion of combined “F” and “G” rating was 27% for Dublin 7. Roscommon had the lowest proportion of combined “A” and “B” rating at 7% (see Table 4).

Dwellings built in 2015-2019 were considerably more energy efficient than in earlier periods with 97% given an “A” rating compared with 36% in 2010-2014 and 1% in 2005-2009 (see Table A and Figure 1).

There was an increase of 10.6% in the number of dwellings receiving a BER audit in the first quarter of 2019 compared with the first quarter of 2018 (see Table 1).

Mains gas was the main space heating fuel used in 56% of the 29,967 dwellings completed during 2015-2019 and with a Building Energy Rating (BER) audit. This was a substantial increase from 2000-2004 when 40% of dwellings with a BER audit used mains gas. There were contrasting trends for heating oil and electricity with 36% of 2000-2004 built dwellings using heating oil compared with 5% for dwellings built in 2015-2019. In contrast usage of electricity increased from 19% in 2000-2004 to 38% in 2015-2019 (see Table 9).

The average floor area of all dwellings with a BER audit was 111 square metres (see Table 11). This average size varied from 156 square metres for detached houses to 58 square metres for basement dwellings.

Table 14 examines dwellings that have had more than one BER audit carried out. In their earliest assessment only 5% of dwellings received either an “A” or “B” rating compared with 19% in their most recent assessment. In contrast, 21% of dwellings were rated “F” or "G" in their first BER assessment compared with only 5% in their latest BER assessment (see Table 14 and Figure 2).