For all non-domestic Building Energy Ratings (BER) awarded from 2009 to the end of Q1 2026, 4% of assessed buildings received an A rating, 15% a B rating, and 32% a C rating (See Table 1).
In 61% of audited buildings the main space heating fuel was electricity, compared with 26% using mains gas and 10% using heating oil (See Table 4).
The use of heating oil as the main space heating fuel in non-domestic BER audits was most common in the Border region (23%), and lowest in the Dublin region (4%) (See Table A).
A ratings were given to almost half (47%) of BERs for non-domestic buildings built from 2025 to end of Q1 2026 (See Figure 2 and Table 10).
Schools & Colleges were the most energy efficient non-domestic building type audited, with 51% receiving an A rating. The highest proportion of G ratings were in Workshops & Maintenance Depots (23%) (See Figure 1 and Table 1).
The tables in the Non-Domestic Building Energy Ratings release for Q1 2026 have been reduced and simplified compared with previous releases for readability purposes. Any feedback from our users is welcome.
BER certificates expire after 10 years unless a new audit has been undertaken. The CSO has included these expired certificates in this release in order to have a more representative analysis of energy efficiency in the non-domestic sector. Provisional BER certificates for buildings that are incomplete or not yet constructed are not included.
In the titles of the tables that follow, the years “2009-2026” describe the period when all BER certificates were published. Tables 9 and 10 also use years to refer to the period in which rated buildings were constructed, which can affect energy efficiency.
The use of heating oil as the main space heating fuel in non-domestic BER audits was most common among the Border counties (23%), and lowest in the Dublin region (4%). Mains gas usage was highest in the Dublin region, at 38% (See Table A and Table 3 for a more detailed breakdown by county).
| Table A Main Space Heating Fuel by NUTS3 Region (Non-Domestic) 2009-2026 | |||||||
| % of row | Number | m2 | |||||
| Fuel Type | |||||||
| NUTS3 Region | Main Gas | Heating Oil | Electricity | LPG | Other | Total NDBER's | Total Floor Area |
| Border | 10 | 23 | 59 | 5 | 3 | 5,741 | 3,153,460 |
| West | 10 | 16 | 69 | 3 | 2 | 7,941 | 4,576,129 |
| Mid-West | 21 | 14 | 61 | 2 | 2 | 8,162 | 5,307,963 |
| South-East | 21 | 12 | 62 | 3 | 2 | 6,736 | 4,055,089 |
| South-West | 22 | 9 | 64 | 2 | 2 | 10,624 | 6,692,715 |
| Dublin | 38 | 4 | 57 | 0 | 1 | 29,930 | 28,823,622 |
| Mid-East | 27 | 9 | 62 | 1 | 2 | 11,425 | 7,464,940 |
| Midland | 17 | 17 | 61 | 3 | 2 | 4,387 | 2,679,037 |
| Total | 26 | 10 | 61 | 2 | 2 | 84,946 | 62,752,955 |
| A | B | C | D | E | F | G | |
| Retail | 1 | 16 | 37 | 18 | 10 | 6 | 12 |
| Office | 3 | 10 | 29 | 23 | 13 | 8 | 14 |
| Restaurant/public house | 1 | 10 | 34 | 32 | 15 | 5 | 4 |
| Hotel | 5 | 29 | 38 | 17 | 5 | 3 | 2 |
| Warehouses | 2 | 16 | 33 | 20 | 10 | 6 | 13 |
| Workshops/maintenance depot | 0 | 9 | 23 | 22 | 14 | 10 | 23 |
| Industrial process building | 3 | 30 | 27 | 16 | 11 | 4 | 9 |
| Hospitals and primary health care | 10 | 14 | 25 | 21 | 12 | 8 | 10 |
| Community/day centre | 12 | 23 | 29 | 16 | 8 | 5 | 7 |
| Nursing residential homes and hostels | 17 | 41 | 26 | 11 | 3 | 1 | 2 |
| Schools and colleges | 51 | 16 | 15 | 9 | 4 | 2 | 3 |
| Sports facilities | 3 | 30 | 29 | 17 | 8 | 6 | 8 |
| Other | 17 | 18 | 21 | 14 | 10 | 6 | 14 |
Schools & Colleges were the most energy efficient non-domestic building type audited, with 51% receiving an A rating. The highest proportion of G ratings were in Workshops & Maintenance Depots (23%) (See Figure 1 and Table 1).
For 61% of audited buildings the main space heating fuel was electricity, compared with 26% using mains gas and 10% using heating oil (See Table 4).
The highest proportion of heating oil usage was 28% in Hotels, compared with 46% of BER rated Hotels using mains gas and 14% using electricity (See Table 4).
The average floor area for all audited non-domestic buildings was 739 m2. The building type with the largest average floor area was Hotels (3,414 m2) while the smallest was Restaurants and Public Houses (284 m2) (See Table 6).
Retail buildings had an average floor area of 337 m2, less than half that of Office buildings (815 m2) (See Table 6).
The primary energy usage per square metre for Retail buildings was 858 kWh/m2/year, more than twice that of Offices (398 kWh/m2/year) (See Table 7).
A ratings were given to almost half (47%) of BERs for non-domestic buildings built since 2025. By comparison, A ratings were 21% of BERs awarded for buildings built between 2015-2019, and 4% of the overall audited stock (See Figure 2 and Table 10).
| A | B | C | D | E | F | G | |
| 1900-1977 | 0 | 7 | 29 | 26 | 15 | 9 | 13 |
| 1978-1999 | 1 | 14 | 36 | 22 | 12 | 7 | 10 |
| 2000-2004 | 0 | 19 | 43 | 19 | 8 | 4 | 7 |
| 2005-2009 | 2 | 18 | 34 | 18 | 9 | 6 | 14 |
| 2010-2014 | 6 | 22 | 28 | 19 | 10 | 5 | 10 |
| 2015-2019 | 21 | 35 | 19 | 10 | 4 | 2 | 8 |
| 2020-2024 | 44 | 20 | 16 | 9 | 4 | 3 | 4 |
| 2025-2029 | 47 | 20 | 16 | 7 | 4 | 2 | 3 |
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Statistician's Comment
The Central Statistics Office (CSO) has today (01 May 2026) published Non-Domestic Building Energy Ratings for Quarter 1 (Q1) 2026.
Commenting on the release, Kevin Hunt, Statistician in the Climate and Energy Division, said: "The number of non-domestic buildings with Building Energy Ratings (BER) reported up to the end of the first quarter of 2026 was 84,946. Of these, A ratings were awarded to 4%, B ratings to 15% and C ratings to 32% (See Table 1).
A ratings were given to almost half (47%) of BERs for non-domestic buildings built from the beginning of 2025 to the end of Q1 2026. By comparison 21% of buildings built between 2015-2019 were A rated, along with 4% of the overall audited stock (See Figure 2 and Table 10).
Schools & Colleges were the most energy efficient non-domestic building type audited, with 51% receiving an A rating. The highest proportion of G ratings were in Workshops & Maintenance Depots (23%) (See Figure 1 and Table 1).
For 61% of audited buildings the main space heating fuel was electricity, compared with 26% using mains gas and 10% using heating oil (See Table 4).
The average floor area for all audited non-domestic buildings was 739 m2. The building type with the largest average floor area was Hotels (3,414 m2) while the smallest were Restaurants and Public Houses (284 m2) (See Table 6)."