More than 80% of homes built since 2020 are heated using electricity.
In the same time, CSO figures show no home with a building energy rating has been constructed with an oil boiler installed, compared to more than a third 20 years ago.
The lowest proportion of A-rated homes are in Leitrim, while the highest are in the east - Kildare, County Dublin and Meath.
Just 1% of apartments nationally had the highest rating possible, while 43% were given a BER of D or less.
