Building Energy Ratings in Co. Dublin
116,276 certificates · median 146 kWh/m²/yr · rank 5 of 52 counties on the share rated B3 or better
Half of the dwellings rated in Co. Dublin use more than 146 kWh/m²/yr.
The national median is 178 kWh/m²/yr. 52.9% of the certificates on the 2009 scale are B3 or better; 10.1% are E, F or G.
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Ratings
2009 scale, A1 to E2 — 104,391 certificates
| Rating | Certificates | Share |
|---|---|---|
| A1 | 2,238 | 2.1% |
| A2 | 22,672 | 21.7% |
| A3 | 11,062 | 10.6% |
| B1 | 3,292 | 3.2% |
| B2 | 6,113 | 5.9% |
| B3 | 9,824 | 9.4% |
| C1 | 10,499 | 10.1% |
| C2 | 10,352 | 9.9% |
| C3 | 8,823 | 8.5% |
| D1 | 7,827 | 7.5% |
| D2 | 6,098 | 5.8% |
| E1 | 3,214 | 3.1% |
| E2 | 2,377 | 2.3% |
2026 scale, A0 to E — 7,143 certificates
| Rating | Certificates | Share |
|---|---|---|
| A0 | 2,442 | 34.2% |
| A | 1,174 | 16.4% |
| B | 1,715 | 24.0% |
| C | 1,288 | 18.0% |
| D | 323 | 4.5% |
| E | 201 | 2.8% |
F and G — the same on both scales
| Rating | Certificates | Share of all certificates |
|---|---|---|
| F | 2,393 | 2.1% |
| G | 2,349 | 2.0% |
⚠️ The two scales are shown apart on purpose: adding a « B » from the 2026 scale to « B1+B2+B3 » from the 2009 scale would produce a number that exists nowhere. F and G belong to both, so they are counted in neither distribution and shown on their own. How the two scales compare.
What the certificates measure
| Certificates | 116,276 |
| Median energy use | 146 kWh/m²/yr |
| Median CO₂ | 28.0 kg CO₂/m²/yr |
| Median floor area | 105 m² |
| Median wall U-value | 0.37 W/m²K |
| Median roof U-value | 0.19 W/m²K |
| Median floor U-value | 0.32 W/m²K |
| Median window U-value | 2.20 W/m²K |
| Median heating system efficiency | 91% |
| Certificates with solar PV | 1,535 (1.3%) |
| Median renewable energy ratio | 0.19 |
| National median energy use | 178 kWh/m²/yr |
By period of construction
| Built | Certificates | Median kWh/m²/yr | Median wall U-value |
|---|---|---|---|
| before 1900 | 1,818 | 292 | 1.64 |
| 1900–1944 | 5,298 | 267 | 1.38 |
| 1945–1969 | 10,551 | 227 | 1.33 |
| 1970–1979 | 11,324 | 219 | 1.07 |
| 1980–1990 | 9,962 | 203 | 0.60 |
| 1991–1999 | 12,541 | 189 | 0.55 |
| 2000–2004 | 14,507 | 175 | 0.55 |
| 2005–2009 | 12,479 | 147 | 0.37 |
| 2010–2018 | 10,970 | 54 | 0.18 |
| 2019 or later | 26,826 | 38 | 0.18 |
Periods with fewer than 11 certificates are not shown separately.
By dwelling type
| Type | Certificates | Median kWh/m²/yr | Median floor area (m²) |
|---|---|---|---|
| Semi-detached house | 35,642 | — | — |
| Mid-terrace house | 18,008 | — | — |
| Detached house | 17,536 | — | — |
| Mid-floor apartment | 12,531 | — | — |
| End of terrace house | 11,510 | — | — |
| Ground-floor apartment | 9,172 | — | — |
| Top-floor apartment | 7,693 | — | — |
| Maisonette | 3,282 | — | — |
| House | 679 | — | — |
| Apartment | 169 | — | — |
Main space heating fuel
| Fuel | Certificates | Share | Median kWh/m²/yr |
|---|---|---|---|
| Mains Gas | 68,477 | 58.9% | — |
| Electricity | 33,450 | 28.8% | — |
| Heating Oil | 10,263 | 8.8% | — |
| Manufactured Smokeless Fuel | 262 | 0.2% | — |
| Bulk LPG (propane or butane) | 141 | 0.1% | — |
| Solid Multi-Fuel | 94 | 0.1% | — |
| Wood Pellets (bulk supply for | 32 | 0.0% | — |
| House Coal | 27 | 0.0% | — |
| Bottled LPG | 21 | 0.0% | — |
| Wood Logs | 12 | 0.0% | — |
One certificate is one assessment of one dwelling, not one dwelling: a home rated twice appears twice. How this is counted.