The assessor will have added recommendations to the EPC report and it is up to you whether or not you wish to make these improvements yourself or leave it for the potential buyer to do once acquired. These suggestions should only be accepted as recommendations, there is no legal right in having to make these energy upgrades, it is at the seller/buyer discretion. Due to the nature of an EPC being a legal requirement, all complaints must be investigated. If errors are found and as a result a new EPC is required. It will be produced with no cost to the complaining party. If there is no satisfactory resolution, the accreditation scheme will refer it to a third party. Maximising potential for squared.energy/epc-commercial-property/ epc commercial property isn't the same as meeting client requirements and expectations.