If you're buying, selling, or renting a property in the UK, you'll encounter the term Energy Performance Certificate (EPC). But what exactly is it, and why does it matter? Let's break it down.
What is an EPC?
An EPC assesses a property's energy efficiency, rating it from A (most efficient) to G (least efficient). It provides insights into energy usage and potential savings. Legally, an EPC is required when selling or renting out a property.
All EPCs for existing dwellings are calculated using a method called RdSAP (Reduced Data Standard Assessment Procedure), think of it as the algorithm that takes all the data regarding your property and compiles the final report. Versions of RdSAP are updated every now and then and there is an update coming this year, but more on that later!
There is a "Full SAP" EPC which is reserved for new build houses and conversions too that uses Standard Assessment Procedure (SAP).
How is an EPC Calculated?
EPCs are determined using the Reduced Data Standard Assessment Procedure (RdSAP), considering factors like insulation, heating systems, and lighting. An accredited assessor conducts a non-invasive survey to gather this information.
There are various predefined options that the surveyor can select depending on the building fabric or part that has been observed.
How Long does an EPC Last?
In England and Wales, an EPC is valid for 10 years. However, if significant energy efficiency improvements are made, updating the EPC sooner is advisable.
If you are buying a property, your mortgage provider may require the EPC to be recent even if it is still valid. There are incentives available if your certificate has a high score.
EPC Requirements for Landlords
Landlords must ensure their rental properties have a minimum EPC rating of E. From 2027, this requirement will increase to a minimum rating of C. The Minimum Energy Efficiency Standard (MEES) is what governs the rental of a unit and if your property scores below a C, it may be worth exploring your options on how to improve your energy performance certificate prior to the new rules coming into play.
EPC Checks
Before the assessor attends the property, there are a number of documents that would be required if you have certain measures installed in your house. These would aid the EPC assessment, and if your prospective tenants are energy conscious, if they see a better rating on your rented property over another, it might just sway them to yours. These include:
- information about insulation
- mechanical ventillation
- glazing certificates (FENSA)
Check out how to prepare for your energy performance certificate too!
Improving Your EPC Rating
Enhancing your property's energy efficiency can improve its EPC rating. Consider installing LED lighting, upgrading insulation, or replacing old boilers with energy-efficient models.
RdSAP 10: Major Changes Coming June 2025
What's Changing?
RdSAP 10 introduces several significant updates to improve the accuracy and usefulness of EPCs:
- Inclusion of New Technologies: Battery storage, PV diverters, and small-scale hydro systems will now be considered in assessments.
- Detailed Data Collection: Assessors will measure all windows individually, provide more roof room data, and offer expanded ventilation options.
- Improved Recommendations: Heat pumps will be recommended more often for well-insulated homes.
- Carbon Impact: New technologies will allow EPCs to more accurately reflect carbon emissions.
What This Means for Property Owners
While these updates will make EPCs more useful, assessments may take slightly longer.
Why Choose Harpr Surveyors for Your EPC Needs
At Harpr Surveyors, we understand how important it is to get EPCs right the first time. We don’t cut corners. From the moment you contact us, we take care of everything - from the initial assessment to the final lodgement.
We're here to answer any of your questions regarding your certificate, helping you understand each section, what it means and what can be done to improve the rating.
Find Your EPC
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