The CSO has released statistics for Building Energy Ratings across the country, with ratings low to average in Tipperary.
Premier County figures show that just 1% of the 25,693 houses assessed between 2009 and 2018 qualified for an A rating, with 1% apiece for the B1 and B2 ratings as well.
Most of the houses assessed were graded in the middle of the spectrum, with 12% achieving a C2 rating, 13% gaining a C3, while the D2 level had 12%.
The highest percentage in Tipperary lay in the D1 rank with 14%.
The average age of the houses assessed was 39 years.