Building Energy Ratings in Co. Donegal
43,582 certificates · median 199 kWh/m²/yr · rank 47 of 52 counties on the share rated B3 or better
Half of the dwellings rated in Co. Donegal use more than 199 kWh/m²/yr.
The national median is 178 kWh/m²/yr. 28.7% of the certificates on the 2009 scale are B3 or better; 24.5% are E, F or G.
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Ratings
2009 scale, A1 to E2 — 36,536 certificates
| Rating | Certificates | Share |
|---|---|---|
| A1 | 608 | 1.7% |
| A2 | 2,437 | 6.7% |
| A3 | 2,011 | 5.5% |
| B1 | 1,189 | 3.3% |
| B2 | 1,425 | 3.9% |
| B3 | 2,808 | 7.7% |
| C1 | 4,767 | 13.0% |
| C2 | 5,262 | 14.4% |
| C3 | 4,754 | 13.0% |
| D1 | 4,135 | 11.3% |
| D2 | 3,457 | 9.5% |
| E1 | 2,022 | 5.5% |
| E2 | 1,661 | 4.5% |
2026 scale, A0 to E — 1,897 certificates
| Rating | Certificates | Share |
|---|---|---|
| A0 | 220 | 11.6% |
| A | 281 | 14.8% |
| B | 518 | 27.3% |
| C | 588 | 31.0% |
| D | 184 | 9.7% |
| E | 106 | 5.6% |
F and G — the same on both scales
| Rating | Certificates | Share of all certificates |
|---|---|---|
| F | 1,897 | 4.4% |
| G | 3,252 | 7.5% |
⚠️ 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 | 43,582 |
| Median energy use | 199 kWh/m²/yr |
| Median CO₂ | 48.9 kg CO₂/m²/yr |
| Median floor area | 116 m² |
| Median wall U-value | 0.45 W/m²K |
| Median roof U-value | 0.25 W/m²K |
| Median floor U-value | 0.41 W/m²K |
| Median window U-value | 2.70 W/m²K |
| Median heating system efficiency | 85% |
| Certificates with solar PV | 635 (1.5%) |
| Median renewable energy ratio | 0.00 |
| National median energy use | 178 kWh/m²/yr |
By period of construction
| Built | Certificates | Median kWh/m²/yr | Median wall U-value |
|---|---|---|---|
| before 1900 | 1,520 | 411 | 1.64 |
| 1900–1944 | 3,260 | 402 | 1.52 |
| 1945–1969 | 2,563 | 316 | 0.78 |
| 1970–1979 | 4,192 | 274 | 0.60 |
| 1980–1990 | 4,834 | 235 | 0.49 |
| 1991–1999 | 6,230 | 209 | 0.53 |
| 2000–2004 | 8,473 | 191 | 0.55 |
| 2005–2009 | 8,488 | 166 | 0.37 |
| 2010–2018 | 1,339 | 63 | 0.21 |
| 2019 or later | 2,683 | 38 | 0.17 |
Periods with fewer than 11 certificates are not shown separately.
By dwelling type
| Type | Certificates | Median kWh/m²/yr | Median floor area (m²) |
|---|---|---|---|
| Detached house | 23,960 | — | — |
| Semi-detached house | 9,830 | — | — |
| Mid-terrace house | 2,570 | — | — |
| End of terrace house | 1,706 | — | — |
| House | 1,493 | — | — |
| Top-floor apartment | 1,359 | — | — |
| Ground-floor apartment | 1,103 | — | — |
| Mid-floor apartment | 1,038 | — | — |
| Maisonette | 463 | — | — |
| Basement Dwelling | 33 | — | — |
Main space heating fuel
| Fuel | Certificates | Share | Median kWh/m²/yr |
|---|---|---|---|
| Heating Oil | 30,570 | 70.1% | — |
| Electricity | 8,752 | 20.1% | — |
| Solid Multi-Fuel | 1,894 | 4.3% | — |
| Bulk LPG (propane or butane) | 1,384 | 3.2% | — |
| House Coal | 222 | 0.5% | — |
| Manufactured Smokeless Fuel | 164 | 0.4% | — |
| Mains Gas | 76 | 0.2% | — |
| Wood Pellets (bulk supply for | 74 | 0.2% | — |
| Bottled LPG | 63 | 0.1% | — |
| Sod Peat | 44 | 0.1% | — |
One certificate is one assessment of one dwelling, not one dwelling: a home rated twice appears twice. How this is counted.