Almost two thirds of Energy Performance Certificates issued in the year to September 2016 on domestic properties had the lowest ratings for efficiency and CO2 emissions, government data has revealed.

Figures from the Department for Communities and Local Government show that of 1.5million EPCs issued for domestic properties, 25% had a rating of E, F or G for energy efficiency and 40% had the same rating for C02 emissions.

Of the other ratings, 12% of domestic properties had the highest A or B rating for energy efficiency, while 63% had C or D.

Based on their CO2 emissions, 14% of domestic properties had an Environmental Impact Rating of either A or B. A further 46% were awarded a rating of either C or D.

The number of EPCs lodged on the domestic register is down 18% year-on-year.

New builds fared better. A total of 212,238 EPCs covering new domestic properties were lodged on the Domestic Register during the 12-month period, up 8% on September 2016.

Based on their fuel costs, 77% of new domestic properties were awarded an Energy Efficiency Rating of either A or B. A further 22% were awarded a rating of either C or D, while the remaining 1% were awarded a rating of E, F or G.

Based on their CO2 emissions, 83% of new domestic properties were awarded an Environmental Impact Rating of either A or B. A further 16% were awarded either C or D, while the remaining 1% were awarded a rating of E, F or G.

A total of 15.6million EPCs covering domestic properties have now been lodged between 2008 and the quarter ending September 30, 2016.