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Building Energy Ratings in Waterford City
16,756 certificates · median 189 kWh/m²/yr · rank 38 of 52 counties on the share rated B3 or better
The national median is 178 kWh/m²/yr. 32.7% of the certificates on the 2009 scale are B3 or better; 16.1% are E, F or G.
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Ratings
2009 scale, A1 to E2 — 14,739 certificates
| Rating | Certificates | Share |
|---|---|---|
| A1 | 103 | 0.7% |
| A2 | 1,523 | 10.3% |
| A3 | 663 | 4.5% |
| B1 | 451 | 3.1% |
| B2 | 700 | 4.7% |
| B3 | 1,374 | 9.3% |
| C1 | 1,936 | 13.1% |
| C2 | 1,910 | 13.0% |
| C3 | 1,817 | 12.3% |
| D1 | 1,748 | 11.9% |
| D2 | 1,324 | 9.0% |
| E1 | 709 | 4.8% |
| E2 | 481 | 3.3% |
2026 scale, A0 to E — 875 certificates
| Rating | Certificates | Share |
|---|---|---|
| A0 | 137 | 15.7% |
| A | 82 | 9.4% |
| B | 267 | 30.5% |
| C | 260 | 29.7% |
| D | 82 | 9.4% |
| E | 47 | 5.4% |
F and G — the same on both scales
| Rating | Certificates | Share of all certificates |
|---|---|---|
| F | 482 | 2.9% |
| G | 660 | 3.9% |
⚠️ 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 | 16,756 |
| Median energy use | 189 kWh/m²/yr |
| Median CO₂ | 37.4 kg CO₂/m²/yr |
| Median floor area | 92 m² |
| Median wall U-value | 0.53 W/m²K |
| Median roof U-value | 0.20 W/m²K |
| Median floor U-value | 0.42 W/m²K |
| Median window U-value | 2.70 W/m²K |
| Median heating system efficiency | 90% |
| Certificates with solar PV | 179 (1.1%) |
| 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 | 553 | 325 | 1.53 |
| 1900–1944 | 2,013 | 287 | 1.31 |
| 1945–1969 | 1,396 | 243 | 0.60 |
| 1970–1979 | 1,645 | 218 | 0.60 |
| 1980–1990 | 1,960 | 202 | 0.58 |
| 1991–1999 | 2,760 | 179 | 0.53 |
| 2000–2004 | 2,548 | 186 | 0.55 |
| 2005–2009 | 1,717 | 163 | 0.37 |
| 2010–2018 | 374 | 60 | 0.21 |
| 2019 or later | 1,790 | 40 | 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 | 5,498 | — | — |
| Mid-terrace house | 3,363 | — | — |
| Detached house | 2,928 | — | — |
| End of terrace house | 1,564 | — | — |
| Mid-floor apartment | 1,168 | — | — |
| Top-floor apartment | 1,026 | — | — |
| Ground-floor apartment | 915 | — | — |
| House | 148 | — | — |
| Maisonette | 122 | — | — |
| Basement Dwelling | 19 | — | — |
Main space heating fuel
| Fuel | Certificates | Share | Median kWh/m²/yr |
|---|---|---|---|
| Mains Gas | 8,991 | 53.7% | — |
| Electricity | 4,884 | 29.1% | — |
| Heating Oil | 2,472 | 14.8% | — |
| Manufactured Smokeless Fuel | 215 | 1.3% | — |
| Solid Multi-Fuel | 89 | 0.5% | — |
| Bulk LPG (propane or butane) | 21 | 0.1% | — |
| House Coal | 20 | 0.1% | — |
One certificate is one assessment of one dwelling, not one dwelling: a home rated twice appears twice. How this is counted.