Building Energy Ratings in Co. Carlow
17,731 certificates · median 187 kWh/m²/yr · rank 28 of 52 counties on the share rated B3 or better
Half of the dwellings rated in Co. Carlow use more than 187 kWh/m²/yr.
The national median is 178 kWh/m²/yr. 35.5% of the certificates on the 2009 scale are B3 or better; 18.8% are E, F or G.
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Ratings
2009 scale, A1 to E2 — 15,383 certificates
| Rating | Certificates | Share |
|---|---|---|
| A1 | 152 | 1.0% |
| A2 | 1,217 | 7.9% |
| A3 | 1,162 | 7.6% |
| B1 | 619 | 4.0% |
| B2 | 794 | 5.2% |
| B3 | 1,524 | 9.9% |
| C1 | 1,950 | 12.7% |
| C2 | 2,098 | 13.6% |
| C3 | 1,781 | 11.6% |
| D1 | 1,638 | 10.6% |
| D2 | 1,252 | 8.1% |
| E1 | 616 | 4.0% |
| E2 | 580 | 3.8% |
2026 scale, A0 to E — 685 certificates
| Rating | Certificates | Share |
|---|---|---|
| A0 | 34 | 5.0% |
| A | 135 | 19.7% |
| B | 239 | 34.9% |
| C | 194 | 28.3% |
| D | 50 | 7.3% |
| E | 33 | 4.8% |
F and G — the same on both scales
| Rating | Certificates | Share of all certificates |
|---|---|---|
| F | 609 | 3.4% |
| G | 1,054 | 5.9% |
⚠️ 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 | 17,731 |
| Median energy use | 187 kWh/m²/yr |
| Median CO₂ | 40.8 kg CO₂/m²/yr |
| Median floor area | 107 m² |
| Median wall U-value | 0.40 W/m²K |
| Median roof U-value | 0.21 W/m²K |
| Median floor U-value | 0.41 W/m²K |
| Median window U-value | 2.47 W/m²K |
| Median heating system efficiency | 87% |
| Certificates with solar PV | 245 (1.4%) |
| 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 | 509 | 354 | 1.50 |
| 1900–1944 | 1,547 | 347 | 1.41 |
| 1945–1969 | 1,321 | 284 | 0.79 |
| 1970–1979 | 1,609 | 245 | 0.60 |
| 1980–1990 | 1,582 | 217 | 0.44 |
| 1991–1999 | 2,583 | 203 | 0.55 |
| 2000–2004 | 3,194 | 185 | 0.55 |
| 2005–2009 | 3,241 | 157 | 0.37 |
| 2010–2018 | 653 | 60 | 0.21 |
| 2019 or later | 1,492 | 43 | 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 | 6,817 | — | — |
| Semi-detached house | 5,628 | — | — |
| Mid-terrace house | 2,030 | — | — |
| End of terrace house | 1,320 | — | — |
| Top-floor apartment | 654 | — | — |
| Ground-floor apartment | 484 | — | — |
| House | 367 | — | — |
| Mid-floor apartment | 342 | — | — |
| Maisonette | 69 | — | — |
| Apartment | 20 | — | — |
Main space heating fuel
| Fuel | Certificates | Share | Median kWh/m²/yr |
|---|---|---|---|
| Heating Oil | 7,726 | 43.6% | — |
| Mains Gas | 5,126 | 28.9% | — |
| Electricity | 3,965 | 22.4% | — |
| Solid Multi-Fuel | 495 | 2.8% | — |
| Bulk LPG (propane or butane) | 188 | 1.1% | — |
| Manufactured Smokeless Fuel | 110 | 0.6% | — |
| House Coal | 33 | 0.2% | — |
| Wood Pellets (bulk supply for | 19 | 0.1% | — |
| Wood Logs | 14 | 0.1% | — |
| Bottled LPG | 11 | 0.1% | — |
One certificate is one assessment of one dwelling, not one dwelling: a home rated twice appears twice. How this is counted.