Since October 2008, all rental properties in England and Wales have been legally required to have an Energy Performance Certificate (EPC) before being marketed.
On 1st April 2018, the Minimum Energy Efficiency Standards (MEES) came into effect. These rules state that:
The UK government continues to review EPC standards, with proposals to raise the minimum requirement for rental properties to ‘C’ by 2028. Landlords and homeowners are encouraged to plan energy efficiency improvements early to avoid compliance issues.