Across the State, the most common main space heating fuel in dwellings with a Building Energy Rating (BER), up to Q3 2026, was heating oil (34%), followed by mains gas (33%), and electricity (26%) (See Figure 3 and Table 3).
Electricity was the most common space heating fuel for dwellings built in the periods 2015 to 2019 (47%), 2020 to 2024 (86%), and 2025 to 2029 (95%), while heating oil was most common among rated dwellings built before the year 2000 (See Figure 6 and Table 6).
By the end of Q3 2026, 28% of dwellings with a BER included either a solar energy installation, a heat pump for space heating, or both (See Figure 2 and Table 2).
Over 99% of audited dwellings built since 2020 received a rating of A or A0 (See Figure 5 and Table 5).
Over 12,000 dwellings have received the highest rating of A0 since it was introduced on 24 May 2026 (See Table 1 and Figure 1).
By county, the highest proportion of A or A0 rated dwellings were in Co. Kildare (30%), Dublin County (30%) and Co. Meath (29%) (See Figure 7 and Table 7).
By the end of Q3 2026, over 1.4 million dwellings had received at least one BER rating, with 19% rated A0 or A in the most recent audit, and 18% rated B (See Table 1 and Figure 1).
Please refer to the Background Notes for more details on the changes to the rating system introduced on 24 May 2026 or to the SEAI website.
Users can create their own cross-tabulations of these data using the open data tables EBQ02 (by NUTS3 region) and EBQ03 (by county and Dublin postal district and also including average floor area).
By the end of Q3 2026, over 1.4 million dwellings had received a BER rating. Of these 19% received an A0 or A rating, 18% a B rating and 30% a C rating. Over 12,000 dwellings received the A0 rating since it was introduced on 24 May 2026 (See Table 1 and Figure 1).
By the end of Q3 2026, 28% of dwellings with a BER listed a source of renewable energy at the time of rating, where this source was solar energy, heat pumps for space heating, or both. This was an increase compared with the total by the same quarter of 2025 (25%) and 2024 (22%) (See Figure 1 and Table 2).
Across the State, the most common main space heating fuel in rated dwellings up to Q3 2026 was heating oil (34%), followed by mains gas (33%), and electricity (26%). Mains gas had been the most common heating fuel among rated dwellings across the previous ten-year period (See Figure 3 and Table 3).
There was a regional variation to the distribution of main space heating fuels. Mains gas was the most common space heating fuel in Dublin (60% gas heated) and the Mid-East region (38% gas heated). By comparison, heating oil was most common in all other regions: Border (66% oil heated), West (60% oil heated), South-East (49% oil heated), Mid-West (48% oil heated), South-West (37% oil heated) and Midland (49% oil heated) (See Figure 4 and Table 4).
Over 99% of audited dwellings built since 2020 received a rating of A0 or A. A0 or A ratings were also received by 93% of dwellings built from 2015-2019, 40% of those built from 2010-2014 and 7% built between 2005-2009 (See Figure 5 and Table 5).
Electricity was the most common space heating fuel for dwellings built in the periods 2015 to 2019 (47%), 2020-2024 (86%), and 2025 to 2029 (95%), while heating oil was most common in dwellings built in 1999 or earlier (See Figure 6 and Table 6).
The highest proportion of A or A0 rated dwellings were in Co. Kildare (30%), Dublin County (30%) and Co. Meath (29%). The lowest proportion of A or A0 rated dwellings were in Co. Leitrim (7%) and Cork City (7%) (See Figure 7 and Table 7).
In the Dublin Postal Districts, the highest proportion of A or A0 ratings were in Dublin 18 (46%), Dublin 13 (33%) and Dublin 20 (27%) (See Figure 8 and Table 7).
The highest proportions of F or G rated dwellings were in Co. Leitrim (16%) and Co. Roscommon (16%) (See Figure 7 and Table 7).
The average floor area for all rated dwellings was 118m2. The dwelling type with the largest average floor area was detached houses (168 m2) while the smallest type was apartments (70 m2) (See Figure 9 and Table 8).
Learn about our data and confidentiality safeguards, and the steps we take to produce statistics that can be trusted by all.
Statistician's Comment
The Central Statistics Office (CSO) has today (23 October 2026) published Domestic Building Energy Ratings (BER) for Quarter 3 (Q3) 2026.
Commenting on the release, Kevin Hunt, Statistician in the Climate and Energy Division, said: “By the end of Q3 2026, more than 1.4 million dwellings had received a BER rating. Of these, 19% received an A0 or A rating, 18% a B rating and 30% a C rating. More than 12,000 dwellings received the A0 rating since it was introduced on 24 May 2026 (See Table 1, Figure 1, and the SEAI website for more information on A0 ratings).
Renewable Energy Installations
By the end of Q3 2026, 28% of dwellings with a BER included either a solar energy installation, a heat pump for space heating, or both. This was an increase compared with the total in Q3 2025 (25%) and Q3 2024 (22%) (See Figure 2 and Table 2).
Main Space Heating Fuel
Across the State, the most common main space heating fuel in rated dwellings up to Q3 2026 was heating oil (34%), followed by mains gas (33%), and electricity (26%) (See Figure 3 and Table 3).
Mains gas was the most common space heating fuel in Dublin (60% gas heated) and the Mid-East (Kildare, Louth, Meath, and Wicklow) region (38% gas heated). Heating oil was the most common space heating fuel in all other regions (See Figure 4 and Table 4):
Energy Ratings by Period of Construction
More than 99% of audited dwellings built since 2020 received a rating of A0 or A. A0 or A ratings were also received by 93% of dwellings built from 2015 to 2019, 40% of those built from 2010 to 2014 and 7% built between 2005 to 2009 (See Figure 5 and Table 5).
Local Area Analysis
The highest proportion of A0 or A rated dwellings were in Co. Kildare (30%), Dublin County (30%), and Co. Meath (29%). The lowest proportion of A0 or A rated dwellings were in Co. Leitrim (7%) and Cork City (7%) (See Figure 7 and Table 7).
In the Dublin Postal Districts, the highest proportion of A0 or A ratings were in Dublin 18 (46%), Dublin 13 (33%), and Dublin 20 (27%) (See Figure 8 and Table 7).
The highest proportions of F or G rated dwellings were in Co. Leitrim (16%) and Co. Roscommon (16%) (See Figure 7 and Table 7).
Floor Area by Dwelling Type
The average floor area for all rated dwellings was 118 m2. The dwelling type with the largest average floor area was detached houses (168 m2) while the smallest type was apartments (70 m2) (See Figure 9 and Table 8)."