An Energy Performance Certificate informs a tenant about the energy performance of a property, which is a legal requirement that needs to be in place before a property is marketed. Once all refurbishments and work are done on your property after buying, then this is the logical next step.
A copy of your properties EPC must be available to prospective tenants at all times. The ratings on the certificate range from A (most energy efficient) to G (most energy inefficient). Typically, the rating is much better for newer buildings than older. Due to cost factors, a good EPC rating could make your property more attractive to prospective buyers. An EPC certificate is valid for ten years after the date of issue.