The number of non-domestic Building Energy (BER) audits reported between July and September (Q3) 2025 was 2% lower than Q3 2024 (See Figure 1 and Table 1).
Retail was the most common type of premises assessed, comprising 37% of all ratings.
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 A, Table 7, and Table 8).
By type of building, Retail was the most likely to use electricity as the main space heating fuel (76%), while Hotels were the least likely (13%) (See Table A and Table 8).
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).
More than 40% of assessed buildings constructed since 2020 were A rated, compared with 4% of the overall stock (See Figure 4 and Table 13).
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 have been excluded from this release. This exclusion also applies to new Shell and Core Buildings, which are rated and sold as bare structures before being fully fitted.
Retail was the most common type of premises assessed, comprising 37% of all ratings. Offices were the second most common, with 24% of the total (See Table A).
Electricity was the most common main space heating fuel for 61% of assessed buildings, compared with 26% using gas and 10% using heating oil by type of premises. Retail was the most likely, to use electricity as the main space heating fuel (76%), while Hotels were the least likely (13%) (See Table A and Table 8).
The tables that follow contain more detailed breakdowns on BERs by type of premises, heating fuel, and floor area.
| Table A Main Space Heating System Fuel and Total Floor Area by Type of Building (Non-Domestic) 2009-2025 | |||||||
| % of row | Number | m2 | |||||
| Type of Building | Heating System Fuel | Total BERs | Total Floor Area | ||||
| Mains Gas | Heating Oil | Electricity | LPG | Other | |||
| Retail | 18 | 5 | 76 | 1 | 1 | 30,480 | 10,177,038 |
| Office | 30 | 8 | 60 | 1 | 1 | 19,503 | 15,773,090 |
| Restaurant/public house | 28 | 23 | 42 | 4 | 3 | 7,837 | 2,231,754 |
| Hotel | 46 | 29 | 13 | 11 | 1 | 1,248 | 4,188,851 |
| Warehouses | 31 | 10 | 54 | 1 | 3 | 9,880 | 12,683,993 |
| Other | 31 | 17 | 46 | 4 | 2 | 12,919 | 14,823,294 |
| Total | 26 | 10 | 61 | 2 | 2 | 81,867 | 59,878,020 |
The number of non-domestic Building Energy Rating (BER) audits reported in July to September (Q3) 2025 was 1,381. This was 2% lower than the 1,404 audits reported in Q3 2024 (See Table 1 and Figure 1). In total, there were 83,566 non-domestic BER audits reported for the period 2009 to 2025 (See Table 1).
| 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 | 457 |
| August | 394 | 351 | 409 | 407 |
| September | 416 | 437 | 552 | 517 |
| October | 288 | 437 | 431 | |
| November | 394 | 420 | 487 | |
| December | 293 | 353 | 387 |
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).
| BER Ratings | |
| A | 3.182 |
| B | 12.049 |
| C | 26.428 |
| D | 16.736 |
| E | 8.86 |
| F | 5.199 |
| G | 9.413 |
| BER Ratings | |
| A | 3.182 |
| B | 12.049 |
| C | 26.428 |
| D | 16.736 |
| E | 8.86 |
| F | 5.199 |
| G | 9.413 |
Schools and Colleges were the most energy efficient non-domestic building type audited, with 50% receiving an A rating. The second most energy efficient building type were Nursing Residential Homes and Hostels, with 17% rated A. The highest proportion of G ratings were in Workshops and 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 | 0 | 9 | 34 | 32 | 15 | 5 | 4 |
| Hotel | 5 | 29 | 38 | 18 | 6 | 3 | 2 |
| Warehouses | 2 | 16 | 33 | 20 | 10 | 6 | 14 |
| Workshops/maintenance depot | 0 | 9 | 23 | 22 | 14 | 10 | 23 |
| Industrial process building | 3 | 31 | 27 | 16 | 11 | 4 | 9 |
| Hospitals and primary health care | 10 | 14 | 25 | 20 | 12 | 8 | 10 |
| Community/day centre | 11 | 23 | 29 | 17 | 8 | 5 | 7 |
| Nursing residential homes and hostels | 17 | 42 | 26 | 11 | 3 | 0 | 2 |
| Schools and colleges | 50 | 17 | 15 | 9 | 3 | 2 | 3 |
| Sports facilities | 3 | 30 | 29 | 17 | 8 | 6 | 8 |
| Other | 17 | 18 | 21 | 14 | 9 | 6 | 15 |
The highest proportion of A ratings by county was in County Kildare (7%). 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% each in Dublin 8 and Dublin 6W (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%), and heating oil was the second most common (29%) (See Table 8). Mains gas (41%) 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 731 m2. The building type with the largest average floor area was Hotels (3,356 m2) while the smallest was Restaurants and Public Houses (285 m2) (See Table 10).
A ratings were given to over two fifths of BERs for non-domestic buildings built between 2020-2024 (44%) and in 2025 to-date (49%). 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 | 23 | 12 | 7 | 10 |
| 2000-2004 | 0 | 18 | 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 | 49 | 22 | 15 | 7 | 3 | 2 | 3 |
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Statistician's Comment
The Central Statistics Office (CSO) has today (16 October 2025) published Non-Domestic Building Energy Ratings for Quarter 3 (Q3) 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 July to September (Q3) 2025 was 1,381. This was 2% lower than the 1,404 audits reported in Q3 2024 (See Table 1). In total, there were 83,566 non-domestic BER audits reported for the period 2009 to 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 2020-2024 (44%) and in 2025 to-date (49%). 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
Schools & Colleges were the most energy efficient non-domestic building type audited, with 50% 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).
Main Space Heating Fuel
For 61% of audited buildings the main space heating fuel was electricity, compared with 26% using mains gas and 10% using heating oil. In Hotels, mains gas was the most common fuel source for space heating (46%), and heating oil was the second most common (29%) (See Table 8).
Local Area Analysis
The highest proportion of A ratings by county was in County Kildare (7%). 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% each in Dublin 8 and Dublin 6W (See Table 5).
Floor Area
The average floor area for all audited non-domestic buildings was 731 m2. The building type with the largest average floor area was Hotels (3,356 m2) while the smallest was Restaurants & Public Houses (285 m2) (See Table 10).”