There were 5,476 non-domestic Building Energy Ratings (BERs) published in 2025, 2% fewer than in 2024 (See Figure 1, Table A and Table 1).
Retail was the most frequently reported non-domestic building type (37%) followed by Offices (25%) (See Table 3).
F or G ratings were received by 18% of rated Retail buildings and 22% of rated Office buildings. Similarly, 17% of Retail buildings were A or B rated, compared with 13% of Offices (See Table 3).
For all years 2009-2025, 4% of assessed buildings received an A rating, 15% a B rating and 32% a C rating (See Figure 2 and Table 3).
A ratings were received by 45% of assessed buildings constructed since 2020, compared with 4% of the overall rated stock (See Figure 4 and Table 13).
Electricity was the most common main space heating fuel for 61% of assessed buildings, compared with 26% using gas and 10% using heating oil (See Table 7 and Table 8).
By type of building, Retail was most likely to use electricity as the main space heating fuel (76%), followed by Offices (60%) (See Table 8).
The highest proportion of A ratings by county was in County Kildare (8%). Limerick City, Sligo, and Kilkenny had the highest proportions of G rated buildings at 16% each (See Table 5).
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.
The number of non-domestic Building Energy Rating (BER) audits reported in all quarters of 2025 was 5,476. This was 2% lower than the 5,581 audits reported in 2024 (See Table 1). In total, there were 85,131 non-domestic BER audits reported for the period 2009 to 2025 (See Table 1).
| Table A Number of Non-Domestic BER certificates | |||||||
| Number | % change | ||||||
| Period | 2021 | 2022 | 2023 | 2024 | 2025 | 2025/2024 | |
| Quarter 1 | 810 | 998 | 1,100 | 1,284 | 1,125 | -12% | |
| Quarter 2 | 848 | 1,058 | 1,191 | 1,588 | 1,405 | -12% | |
| Quarter 3 | 1,074 | 1,205 | 1,259 | 1,404 | 1,397 | -1% | |
| Quarter 4 | 1,107 | 975 | 1,210 | 1,305 | 1,549 | 19% | |
| Year | 3,839 | 4,236 | 4,760 | 5,581 | 5,476 | -2% | |
On 22 January 2026 at 1.30pm the data in Table A was updated. The percentage change for Non-Domestic BER certificates published for Q4 2025 compared with Q4 2024 was mistakenly recorded as 1.9% instead of 19%. As a result it was rounded to 2% in Table A. We apologise for any inconvenience caused.
| 2022 | 2023 | 2024 | 2025 | |
| January | 247 | 300 | 416 | 335 |
| February | 386 | 310 | 450 | 367 |
| March | 365 | 490 | 418 | 423 |
| April | 385 | 371 | 482 | 444 |
| May | 357 | 400 | 620 | 510 |
| June | 316 | 420 | 486 | 451 |
| July | 395 | 471 | 443 | 459 |
| August | 394 | 351 | 409 | 409 |
| September | 416 | 437 | 552 | 529 |
| October | 288 | 437 | 431 | 539 |
| November | 394 | 420 | 487 | 533 |
| December | 293 | 353 | 387 | 477 |
Including only the most recent audit for each building (83,380), 4% of buildings were awarded an A rating, 15% a B rating, and 32% a C rating (See Figure 2 and Table 3).
| BER Ratings | |
| A | 3.381 |
| B | 12.355 |
| C | 26.913 |
| D | 16.954 |
| E | 8.981 |
| F | 5.273 |
| G | 9.523 |
| BER Ratings | |
| A | 3.381 |
| B | 12.355 |
| C | 26.913 |
| D | 16.954 |
| E | 8.981 |
| F | 5.273 |
| G | 9.523 |
Schools & Colleges were the most energy efficient non-domestic building type audited, with 51% receiving an A rating. The second most energy efficient building type were Nursing Residential Homes & Hostels, with 17% rated A. The highest proportion of G ratings were in Workshops & Maintenance Depots (23%) (See Figure 3 and Table 3).
| 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 | 9 | 34 | 32 | 15 | 5 | 4 |
| Hotel | 5 | 29 | 38 | 18 | 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 | 17 | 8 | 5 | 7 |
| Nursing residential homes and hostels | 17 | 42 | 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 | 9 | 6 | 14 |
The highest proportion of A ratings by county was in County Kildare (8%). Limerick City, Sligo and Kilkenny had the highest proportions of G rated buildings at 16% each (See Table 4). In the Dublin postal districts, the highest proportion of A ratings was in Dublin 20 (9%), while the highest proportion of G ratings was 17% in Dublin 8 (See Table 5).
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 6). In Hotels, mains gas was the most common fuel source for space heating (46%), with heating oil the second most common (29%) (See Table 8). Mains gas (42%) and heating oil (27%) were also the most common main space heating fuel for Nursing Residential Homes and Hostels.
The average floor area for all audited non-domestic buildings was 738 m2. The building type with the largest average floor area was Hotels (3,361 m2) while the smallest was Restaurants and Public Houses (285 m2) (See Table 10).
A ratings were given to more than two-fifths of BERs for non-domestic buildings built between 2020-2025 (45%). By comparison, A ratings were 21% of BERs awarded for buildings built between 2015-2019, and 4% of the overall audited stock (See Figure 4 and Table 13).
| A | B | C | D | E | F | G | |
| 1900-1977 | 0 | 7 | 29 | 26 | 15 | 9 | 13 |
| 1978-1999 | 0 | 13 | 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 | 46 | 20 | 17 | 8 | 4 | 2 | 3 |
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Statistician's Comment
The Central Statistics Office (CSO) has today (22 January 2026) published Non-Domestic Building Energy Ratings for Quarter 4 (Q4) 2025.
Commenting on the release, Kevin Hunt, Statistician in the Climate and Energy Division, said: "The number of non-domestic Building Energy Rating (BER) audits reported in all quarters of 2025 was 5,476. This was 2% lower than the 5,581 audits reported in 2024 (See Figure 1, Table A and Table 1).
Number of Non-Domestic BER Audits
In total, there were 85,131 non-domestic BER audits reported for the period January 2009 to December 2025 (See Table 1). This figure includes multiple audits for some buildings.
Including only the most recent audit for each building, 4% of buildings were awarded an A rating, 15% a B rating, and 32% a C rating (See Figure 2 and Table 3).
Energy Efficiency by Period of Construction
A ratings were given to more than two-fifths of BERs for non-domestic buildings built between 2020-2025 (45%). By comparison, A ratings were 21% of BERs awarded for buildings built between 2015-2019, and 4% of the overall audited stock (See Figure 4 and Table 13)
Energy Efficiency by Building Type
Retail was the most frequently reported non-domestic building type (37%) followed by Offices (25%). A higher proportion of Retail buildings were A or B rated (17%) compared with Offices (13%). Similarly, 22% of Office buildings received an F or G rating, compared with 18% of Retail buildings. Across all building types, Schools & Colleges were the most energy efficient, with 67% receiving an A or B rating (See Table 3). The highest proportion of G ratings were in Workshops & Maintenance Depots (23%) (See Figure 3 and Table 3).
Main Space Heating Fuel
Electricity was the main space heating fuel for 61% of all rated buildings, compared with 26% using mains gas and 10% using heating oil (See Table 6).
By type of building, Retail was the most likely to use electricity as the main space heating fuel (76%), followed by Offices (60%), while Hotels were the least likely (13%) (See Table 8).
Local Area Analysis
The highest proportion of A ratings by county was in County Kildare (8%). Limerick City, Sligo and Kilkenny had the highest proportions of G rated buildings at 16% each (See Table 4). In the Dublin postal districts, the highest proportion of A ratings was in Dublin 20 (9%), while the highest proportion of G ratings was 17% in Dublin 8 (See Table 5).
Floor Area
By average floor area, Offices were larger than Retail buildings by more than double (817 m2 compared with 336 m2). The largest average floor area reported for Office buildings was 1,230 m2 in the Dublin postal districts (see Table 10).”