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By period of construction
The fabric of Irish housing, period by period: median energy use and median U-values.
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| Built | Certificates | Median kWh/m²/yr | Median wall U-value | B3 or better |
|---|---|---|---|---|
| before 1900 | 37,753 | 346 | 1.60 | 16.3% |
| 1900–1944 | 131,842 | 323 | 1.42 | 17.7% |
| 1945–1969 | 130,795 | 262 | 1.06 | 19.7% |
| 1970–1979 | 141,289 | 233 | 0.60 | 17.8% |
| 1980–1990 | 141,711 | 213 | 0.56 | 18.9% |
| 1991–1999 | 167,703 | 199 | 0.55 | 22.0% |
| 2000–2004 | 214,266 | 182 | 0.55 | 25.6% |
| 2005–2009 | 208,592 | 150 | 0.37 | 48.8% |
| 2010–2018 | 67,075 | 57 | 0.19 | 97.4% |
| 2019 or later | 204,621 | 40 | 0.18 | 99.9% |