Electricity was the main space heating fuel in 61% of rated buildings. Electrical heating was highest in Retail Buildings (76%) and lowest among Hotels (14%) and Nursing Homes (18%) (See Table 4).
The distribution of results among 86,435 non-domestic Building Energy Rating (BER) audits published since 2009, is 4% an A or A0 rating, 15% a B rating, 32% a C rating, 20% a D rating, 11% an E rating, and 17% an F or G rating (See Table 1).
Out of all non-domestic buildings receiving an energy rating from January 2009 to June 2026, Schools and Colleges had the highest proportion of A or A0 ratings (51%) (See Figure 1 and Table 1).
A or A0 ratings were awarded to 47% of rated non-domestic buildings built since 2025, and 44% of those built from 2020-2024 (See Figure 2 and Table 9).
On 24 May 2026, the Building Energy Rating (BER) scale was reduced from 15 categories to eight (A0, A, B, C, D, E, F, and G) for both domestic and non-domestic buildings. For this release, the now-deprecated subcategories of BER (A1, A2, A3, B1, B2, B3, C1, C2, C3, D1, D2, E1, and E2) have been assigned their parent rating (A, B, C, D, and E) and are presented together with the BERs awarded under the new system.
The A0 category is an entirely new category for buildings that are both energy-efficient and do not use fossil fuels. A0 ratings can only be awarded to buildings assessed under the new rating system.
Please see the Background Notes for more details on the changes to the rating system introduced on 24 May 2026.
BERs remain valid for 10 years from their date of issue, including those awarded under the old rating system. Expired certificates have been included in these tables to better represent the known distribution 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 8 and 9 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 | 5,807 | 3,185,495 |
| West | 10 | 16 | 69 | 3 | 2 | 8,054 | 4,660,923 |
| Mid-West | 21 | 14 | 61 | 2 | 2 | 8,266 | 5,419,632 |
| South-East | 21 | 12 | 62 | 3 | 2 | 6,866 | 4,155,726 |
| South-West | 22 | 9 | 64 | 2 | 2 | 10,814 | 6,761,376 |
| Dublin | 38 | 4 | 57 | 0 | 1 | 30,463 | 29,655,851 |
| Mid-East | 27 | 9 | 62 | 1 | 2 | 11,677 | 7,633,970 |
| Midland | 17 | 17 | 61 | 3 | 2 | 4,488 | 2,757,742 |
| Total | 26 | 10 | 61 | 2 | 2 | 86,435 | 64,230,715 |
| A/A0 | B | C | D | E | F | G | |
| Retail | 1 | 17 | 37 | 17 | 10 | 6 | 12 |
| Office | 3 | 11 | 29 | 23 | 13 | 8 | 14 |
| Restaurant/public house | 1 | 10 | 34 | 32 | 15 | 5 | 4 |
| Hotel | 5 | 30 | 38 | 17 | 5 | 2 | 2 |
| Warehouses | 2 | 16 | 32 | 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 | 15 | 25 | 21 | 12 | 8 | 10 |
| Community/day centre | 13 | 23 | 29 | 16 | 8 | 5 | 7 |
| Nursing residential homes and hostels | 17 | 41 | 26 | 11 | 2 | 1 | 1 |
| 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 |
Out of all non-domestic buildings receiving an energy rating from January 2009 to June 2026, Schools and Colleges had the highest proportion of A/A0 ratings (51%) (See Figure 1 and Table 1).
Electricity was the main space heating fuel in 61% of rated buildings. Electrical heating was highest in Retail buildings (76%) and lowest among hotels (14%) and nursing homes (18%) (See Table 4).
More than half of all non-domestic buildings with a BER had no mechanical ventilation system, with 56% of NDBERs listing Natural Ventilation as the main ventilation system (See Table 5).
The average floor area for all audited non-domestic buildings was 743 m2. The building type with the largest average floor area was Hotels (3,406 m2) while the smallest was Restaurants and Public Houses (283 m2) (See Table 6).
Primary energy usage and carbon dioxide emissions are estimates based on the provision of space heating, water heating, ventilation, lighting, and associated pumps and fans. The lowest primary energy usage per square metre by type of building was in Schools and Colleges (178 kWh/m2/year) and Offices (391 kWh/m2/year) (See Table 7).
A or A0-ratings were awarded to 47% of rated non-domestic buildings built since 2025, and 44% of those built from 2020-2024 (See Figure 2 and Table 9).
| A/A0 | B | C | D | E | F | G | |
| 1900-1977 | 0 | 7 | 29 | 26 | 15 | 9 | 14 |
| 1978-1999 | 1 | 14 | 36 | 22 | 12 | 6 | 10 |
| 2000-2004 | 0 | 19 | 42 | 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 | 36 | 19 | 10 | 4 | 2 | 8 |
| 2020-2024 | 44 | 20 | 16 | 9 | 4 | 3 | 4 |
| 2025-2029 | 47 | 21 | 16 | 7 | 4 | 2 | 3 |
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Statistician's Comment
The Central Statistics Office (CSO) has today (26 August 2026) published Non-Domestic Building Energy Ratings for Quarter 2 (Q2) 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) audits conducted in the 2009 to 2026 period was 86,435. Of these 4% were awarded an A or A0 rating, 15% a B, and 32% a C (See Table 1).
There were 1,680 BER audits conducted for non-domestic buildings constructed since the beginning of 2025, of which 47% received an A or A0 rating. By comparison, 21% of buildings built between 2015 and 2019 were rated A or A0 (See Figure 2 and Table 9).
Schools & Colleges were the most energy efficient non-domestic building type audited, with 51% receiving an A or A0 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)."