The highest proportion of A rated energy audits was in Dublin 18, at 33% of dwellings with a Building Energy Rating (BER). This finding is based on 15,200 energy audits (See Table 5).
Dublin 18 had the lowest average dwelling age, at 15 years for buildings with a BER audit. Dublin 6 had the oldest average, at 61 years (See Table 5).
The number of domestic building energy rating audits published between April and June (Q2) 2023 was 23% more than Q2 2022 (See Table 1).
Electricity was the main space heating fuel used in 88% of the dwellings with a BER audit and where construction was completed during 2020-2023 (See Table A and Table 9).
Dwellings built in 2015-2019 and in 2020-2023 were considerably more energy efficient than those built in earlier periods with 96% and 99% respectively given an A rating (See Table 2).
At county level, Kildare (24%), Meath (22%) and Dublin County (21%) had the highest proportion of A ratings while Leitrim had the lowest at 3% (See Table 4).
| Table A: Main Space Heating Fuel by Period of Construction (2000-2023) | ||||
| % of row | number | |||
| Period of Construction | Mains Gas | Heating Oil | Electricity | BER audits |
| 2000-2004 | 40% | 36% | 19% | 184,271 |
| 2005-2009 | 44% | 32% | 19% | 170,722 |
| 2010-2014 | 46% | 32% | 19% | 12,811 |
| 2015-2019 | 46% | 5% | 49% | 54,217 |
| 2020-2023 | 12% | 0% | 88% | 52,646 |
| Mains Gas | Heating Oil | Electricity | |
| 2000-2004 | 40 | 36 | 19 |
| 2005-2009 | 44 | 32 | 19 |
| 2010-2014 | 46 | 32 | 19 |
| 2015-2019 | 46 | 5 | 49 |
| 2020-2023 | 12 | 0 | 88 |
| Earliest | Latest | |
| A | 1 | 6 |
| B1 | 1 | 4 |
| B2 | 3 | 7 |
| B3 | 6 | 14 |
| C1 | 9 | 16 |
| C2 | 11 | 14 |
| C3 | 12 | 11 |
| D1 | 13 | 9 |
| D2 | 12 | 7 |
| E1 | 8 | 4 |
| E2 | 7 | 3 |
| F | 8 | 2 |
| G | 9 | 2 |
| National Data | BER Database | |
| A | 9 | 12 |
| B1 | 2 | 2 |
| B2 | 3 | 4 |
| B3 | 7 | 8 |
| C1 | 10 | 11 |
| C2 | 11 | 12 |
| C3 | 11 | 11 |
| D1 | 11 | 11 |
| D2 | 10 | 9 |
| E1 | 6 | 5 |
| E2 | 5 | 4 |
| F | 5 | 4 |
| G | 8 | 6 |
1Dwellings with BERs have been weighted using 2016 Census of Population data to estimate a BER profile for All Dwellings at National level (see Background Notes).
| A | B | C | D | E | F-G | |
| 1700-1977 | 2 | 6 | 19 | 23 | 19 | 30 |
| 1978-1999 | 1 | 9 | 42 | 32 | 11 | 5 |
| 2000-2004 | 1 | 15 | 59 | 19 | 5 | 1 |
| 2005-2009 | 2 | 38 | 49 | 8 | 2 | 0 |
| 2010-2014 | 34 | 57 | 7 | 1 | 0 | 0 |
| 2015-2019 | 96 | 4 | 0 | 0 | 0 | 0 |
| 2020-2023 | 99 | 1 | 0 | 0 | 0 | 0 |
Statistician's Comment
The Central Statistics Office (CSO) has today (17 July 2023) released Domestic Building Energy Ratings for Q2 2023.
Commenting on the release Kevin Hunt, Statistician in the Environment and Climate Division, said: "There were 37,001 Building Energy Rating (BER) audits reported in Q2 2023 compared with 30,127 in Q2 2022. The number of BER audits completed in April 2023 was 30% higher than April 2022, while May 2023 rates were also 30% greater than May 2022. The number of BER audits increased by 11% in June 2023 compared with June 2022. In the period 2009 to June 2023, 1.34 million BER audits were undertaken (See Table 1).
Main Space Heating Fuel
Electricity was the main space heating fuel used in 88% of audited dwellings where construction was completed between 2020 and June 2023. This was a substantial increase from buildings constructed during 2015-2019 when 49% of dwellings with a BER audit used electricity. There was a contrasting trend for mains gas, with 12% of dwellings built between 2020-2023 using mains gas as their main space heating fuel compared with 46% of dwellings built between 2015-2019. Looking at heating oil as the main space heating fuel, 0% of dwellings built between 2020-2023 used heating oil compared with 5% of dwellings built between 2015-2019 (See Table 9).
Period of Construction
Dwellings built in 2020-2023 and in 2015-2019 were considerably more energy efficient than those constructed before then. A ratings were given to 99% of dwellings built between 2020-2023 and 96% of those built between 2015-2019. This compares with 34% of dwellings built between 2010-2014 which were given an A rating, and just 2% of properties constructed between 2005-2009 (See Table 2).
Local Area Analysis
Kildare (24%), Meath (22%) and Dublin County (21%) had the highest proportion of A ratings. Leitrim had the lowest proportion of A ratings at 3% (See Table 4).
Looking specifically at Dublin postal districts, Dublin 18 (33%), Dublin 13 (25%) and Dublin 15 (19%) had the highest proportion of A ratings. Dwellings in Dublin 6 (14%) and Dublin 7 (14%) had the highest proportion of G ratings. Dublin 18 had the lowest average building age at 15 years, while Dublin 6 had the oldest, at 61 years (See Table 5).
Floor Area
The average floor area of all dwellings with a BER audit was 115 square metres. This average size varied from 163 square metres for detached houses to 60 square metres for basement dwellings (See Table 12).
Multiple Audits
Some dwellings have had more than one energy audit conducted. Around 11% of such dwellings received an A or B rating in their earliest assessment, whereas 31% of them received an A or B rating in their most recent assessment. In contrast, 17% of dwellings were rated F or G in their first BER assessment compared with only 4% in their latest BER assessment (See Table 15).
Weighted Analysis
The national level data weighted using Census of Population 2016 figures shows that 5% of dwellings in Ireland would have received an F rating compared with 4% of dwellings that have had a BER assessment. Similarly, 8% of dwellings would have received a G rating compared with 6% of dwellings in the actual BER data. In contrast, 9% of dwellings would have received an A rating at the national level, whereas 12% of dwellings that have had a BER assessment were given an A rating (See Table 2 and Table 16)."