New CSO figures have been released on housing BER between 2009 and 2024.
Most homes across the midlands hold a C in their Building Energy Rating, according to the Central Statistics Office.
In Laois, 13% of homes have a rating of C2, followed by 12% in Westmeath and 11% in Offaly.
CSO figures show Laois also has the highest percentage of dwellings with an A rating, at 15%, while Offaly and Westmeath are at 12% and 10% respectively.
A home in the region has an average age of 32.6 years.
Nationally, 15% of homes achieved an A rating, with an overall average age of 34.