If you’re planning major home renovations, you may be wondering whether you’ll need a new Energy Performance Certificate (EPC) once the work is complete. Since EPCs are legally required when selling or renting a property, it’s important to understand how renovations affect your certificate — and whether a fresh assessment is needed.
EPC Basics: A Quick Reminder
An EPC rates your property’s energy efficiency from A (most efficient) to G (least efficient). Certificates are valid for 10 years, but if you make significant changes to the building’s fabric or heating systems, your old EPC may no longer reflect its true performance.
Renovations That Typically Require a New EPC
Not all home improvements trigger the need for a new EPC, but here are the situations where you should consider one:
1. Insulation Upgrades
Adding or improving loft, wall, or floor insulation changes how much heat your home retains.
Since insulation has a major impact on EPC scores, you’ll likely need a new certificate to reflect the improvement.
2. Heating System Replacement
Installing a new boiler, heat pump, or renewable heating system will affect efficiency.
The EPC should be updated to show the property’s new performance level.
3. Window and Door Replacements
Switching from single glazing to double or triple glazing can significantly reduce heat loss.
Updating your EPC ensures buyers or tenants see the true benefit.
4. Extensions and Conversions
Building an extension, loft conversion, or basement conversion increases floor area.
The EPC needs to cover the entire property, so a new one is essential.
5. Solar Panels or Renewable Energy Installations
Adding solar PV, solar thermal, or other renewables will positively impact your rating.
A new EPC highlights these improvements to prospective buyers and tenants.
Renovations That Don’t Usually Require a New EPC
Cosmetic upgrades such as redecorating, flooring, or kitchen/bathroom refits.
Minor repairs that don’t affect insulation, heating, or structure.
Your old EPC remains valid in these cases — but if you want to showcase energy efficiency improvements for sale or rental purposes, an updated certificate is recommended.
Why Get a New EPC After Renovations?
Reflects true performance – Buyers and tenants see accurate efficiency ratings.
Higher property value – Energy-efficient homes are more desirable.
Legal compliance – Landlords must meet the Minimum Energy Efficiency Standards (MEES).
Marketing advantage – A better EPC band can make your property stand out.
Get Fast, Reliable EPCs After Renovations
At Urgent EPC, we provide quick and affordable EPCs across London. Whether you’ve just finished an extension, upgraded your heating, or improved insulation, we’ll ensure your certificate reflects your property’s true efficiency.
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Contact Us to book your EPC today.
Final Thoughts
You don’t always need a new EPC after home renovations, but if your project has improved insulation, heating, windows, or overall floor area, a fresh certificate ensures your property’s energy efficiency is recorded accurately. This not only keeps you compliant but can also improve your property’s value and appeal.
