An Energy Performance Certificate (EPC) is an official document that measures the energy efficiency of a property. It provides a rating from A (most efficient) to G (least efficient), along with estimated energy costs and recommended improvements.
EPCs are legally required when most properties are sold or let in England, Wales and Northern Ireland. They are used by buyers, tenants, lenders and estate agents as a standard reference point when comparing homes.
What Does an EPC Show?
An EPC contains several key sections:
- The current energy efficiency rating (A–G)
- The potential rating if improvements are made
- Estimated annual energy costs
- Recommendations for improving efficiency
These ratings are calculated using a standardised methodology, meaning properties are assessed consistently across the UK.
When Is an EPC Required?
A valid EPC is required when:
- A property is marketed for sale
- A property is let to a new tenant
- A building is newly constructed
The certificate must be available at the point of marketing — not after an offer has been accepted.
How Long Does an EPC Last?
An EPC is valid for 10 years from the date it is lodged. After this period, a new assessment must be carried out before the property can be sold or re-let.
Many property owners only realise their EPC has expired when preparing to move. A detailed explanation of expiry rules can be found in our guide on when EPCs expire and when a new one is needed.
Why EPCs Matter More Today
EPCs were once seen purely as a compliance document. Today, they increasingly influence:
- Buyer comparisons between similar properties
- Tenant decision-making
- Mortgage discussions
- Long-term upgrade planning for landlords
The relationship between EPC ratings and property values is explored further in our article on how EPC ratings affect house prices, rentals and buyer demand.
What Happens During an EPC Assessment?
An EPC is carried out by a qualified Domestic Energy Assessor. The visit typically lasts between 30 and 60 minutes, during which the assessor records:
- Heating systems and controls
- Insulation levels
- Wall and roof construction
- Glazing type
- Hot water systems
A full breakdown of the assessment process is covered in our guide on what an EPC assessment includes.
Do EPC Ratings Affect Selling or Renting?
While EPC ratings do not automatically prevent a sale or tenancy, they can influence perception — particularly in competitive markets.
For example:
- In commuter-led areas such as Harrow, tenants often compare energy efficiency alongside rent.
- In regional cities like Stoke-on-Trent, similar terraced properties may be judged side by side based on EPC band.
- In areas with strong rental demand such as Preston, EPC compliance is routinely checked at re-letting stage.
- In rural markets including Hereford, older construction can influence EPC outcomes.
- In mixed housing markets such as Dundee, building age plays a key role in rating differences.
Are EPC Recommendations Mandatory?
EPC recommendations are advisory, not mandatory for sellers. However, landlords must ensure properties meet minimum energy efficiency standards before letting.
Our guide on EPC recommendations explained explores this in more detail.
Booking an EPC
If you need a new EPC for selling or letting, arranging an assessment early helps prevent delays during marketing.
EPC assessments can be booked via the online booking page.
Conclusion
An EPC is more than just a certificate — it is now a standard reference point within the UK property market. Understanding what it measures, when it is required and how it is used helps homeowners, landlords and buyers make informed decisions.
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