Do I need a new Commercial EPC if I make improvements?

No — a Commercial Energy Performance Certificate (EPC) doesn’t expire early just because you’ve improved your building. Once issued, it stays valid for ten years from the date it was lodged on the national EPC register. Even if you upgrade your heating, lighting or insulation, the existing certificate remains legally valid until it reaches that expiry date.

That said, you might want to renew early if the improvements are likely to boost your rating. A higher EPC score can make the property more attractive to buyers or tenants and may help with compliance under the Minimum Energy Efficiency Standards (MEES). It’s also a good way to show that the building’s performance has genuinely improved since the last assessment.

In short, there’s no rule that forces you to update an EPC after making changes, it’s entirely your choice. But if your goal is to present the most accurate, up-to-date picture of your building’s efficiency, commissioning a new Commercial EPC is often worth it.