Building Energy Ratings in Co. Galway
52,872 certificates · median 189 kWh/m²/yr · rank 23 of 52 counties on the share rated B3 or better
Half of the dwellings rated in Co. Galway use more than 189 kWh/m²/yr.
The national median is 178 kWh/m²/yr. 37.6% of the certificates on the 2009 scale are B3 or better; 22.3% are E, F or G.
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Ratings
2009 scale, A1 to E2 — 44,697 certificates
| Rating | Certificates | Share |
|---|---|---|
| A1 | 1,031 | 2.3% |
| A2 | 5,104 | 11.4% |
| A3 | 2,269 | 5.1% |
| B1 | 1,740 | 3.9% |
| B2 | 2,595 | 5.8% |
| B3 | 4,084 | 9.1% |
| C1 | 4,840 | 10.8% |
| C2 | 5,371 | 12.0% |
| C3 | 5,032 | 11.3% |
| D1 | 4,662 | 10.4% |
| D2 | 3,830 | 8.6% |
| E1 | 2,278 | 5.1% |
| E2 | 1,861 | 4.2% |
2026 scale, A0 to E — 2,453 certificates
| Rating | Certificates | Share |
|---|---|---|
| A0 | 297 | 12.1% |
| A | 427 | 17.4% |
| B | 885 | 36.1% |
| C | 603 | 24.6% |
| D | 140 | 5.7% |
| E | 101 | 4.1% |
F and G — the same on both scales
| Rating | Certificates | Share of all certificates |
|---|---|---|
| F | 1,962 | 3.7% |
| G | 3,760 | 7.1% |
⚠️ 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 | 52,872 |
| Median energy use | 189 kWh/m²/yr |
| Median CO₂ | 45.0 kg CO₂/m²/yr |
| Median floor area | 124 m² |
| Median wall U-value | 0.37 W/m²K |
| Median roof U-value | 0.21 W/m²K |
| Median floor U-value | 0.41 W/m²K |
| Median window U-value | 2.70 W/m²K |
| Median heating system efficiency | 86% |
| Certificates with solar PV | 977 (1.8%) |
| Median renewable energy ratio | 0.04 |
| National median energy use | 178 kWh/m²/yr |
By period of construction
| Built | Certificates | Median kWh/m²/yr | Median wall U-value |
|---|---|---|---|
| before 1900 | 991 | 392 | 1.61 |
| 1900–1944 | 4,402 | 371 | 1.45 |
| 1945–1969 | 3,780 | 319 | 0.86 |
| 1970–1979 | 4,772 | 255 | 0.58 |
| 1980–1990 | 6,022 | 226 | 0.37 |
| 1991–1999 | 6,723 | 203 | 0.37 |
| 2000–2004 | 10,264 | 182 | 0.52 |
| 2005–2009 | 8,791 | 148 | 0.37 |
| 2010–2018 | 1,769 | 57 | 0.21 |
| 2019 or later | 5,358 | 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) |
|---|---|---|---|
| Detached house | 29,800 | — | — |
| Semi-detached house | 10,104 | — | — |
| Mid-terrace house | 2,978 | — | — |
| House | 2,704 | — | — |
| Top-floor apartment | 1,972 | — | — |
| End of terrace house | 1,971 | — | — |
| Ground-floor apartment | 1,818 | — | — |
| Mid-floor apartment | 842 | — | — |
| Maisonette | 555 | — | — |
| Apartment | 118 | — | — |
Main space heating fuel
| Fuel | Certificates | Share | Median kWh/m²/yr |
|---|---|---|---|
| Heating Oil | 31,515 | 59.6% | — |
| Electricity | 14,325 | 27.1% | — |
| Mains Gas | 2,901 | 5.5% | — |
| Solid Multi-Fuel | 2,230 | 4.2% | — |
| Bulk LPG (propane or butane) | 1,020 | 1.9% | — |
| Sod Peat | 206 | 0.4% | — |
| Manufactured Smokeless Fuel | 183 | 0.3% | — |
| Wood Pellets (bulk supply for | 113 | 0.2% | — |
| Bottled LPG | 81 | 0.2% | — |
| House Coal | 79 | 0.1% | — |
One certificate is one assessment of one dwelling, not one dwelling: a home rated twice appears twice. How this is counted.