Updated EPC after improvements is advisable if you’ve made changes to your home’s energy performance. While your original certificate remains valid for 10 years, it reflects the condition of the property at the time of the assessment. Any upgrades carried out after that date — such as new insulation, a replacement boiler, or solar panels — won’t be reflected in your current rating.

This also applies if you’ve made structural changes to the property. For example, if you’ve added an extension, converted a loft or garage, or significantly altered the layout, these changes may affect how heat is retained and distributed in the home. An updated EPC will take account of the increased floor area, new heating zones, window types, and insulation levels introduced during the work.

Having an updated EPC allows you to demonstrate the full benefits of these improvements, which can positively influence your property’s marketability, compliance with future legislation, and eligibility for grants or funding schemes. For landlords, this is particularly relevant if the changes could bring the property closer to, or above, the proposed Band C rating required for new tenancies from 2025.

An updated assessment can also help highlight any remaining areas for improvement and ensure your energy rating reflects the current state of the property, rather than outdated assumptions.

If you are a landlord, or homeowner, looking for advice around improving your EPC rating have a read of our article here.