EPC After Home Improvements: When to Get a New EPC

Have you recently improved your property with new insulation, heating, windows or other energy-saving measures? You may be wondering whether you need an EPC after home improvements.

In many cases, home improvements do not automatically mean that you need a new Energy Performance Certificate. However, an updated EPC can be useful if you want your certificate to reflect the property’s current energy performance.

An EPC gives a property an energy efficiency rating from A to G. It also provides recommendations for potential energy improvements.

This guide explains when getting a new EPC after improving your London property may be worthwhile.

Do Home Improvements Automatically Require a New EPC?

No. Carrying out an improvement does not automatically make your existing EPC invalid.

For example, you might replace an old boiler, install insulation or upgrade your windows while your current EPC is still valid.

Your existing certificate can normally remain valid unless a newer EPC replaces it.

However, the old certificate may not show the improvements you have made since the assessment.

If you are unsure about your current certificate, you can check the official GOV.UK Energy Performance Certificate guidance.

Why Get an EPC After Home Improvements?

An updated EPC can provide a more current picture of your property’s energy performance.

There are several situations where this can be useful.

1. You Want to See the Effect of Your Improvements

A new assessment can record the property’s current energy-related features.

You may have recently installed:

Loft insulation
Wall insulation
New windows
Improved glazing
A new boiler
Heating controls
Solar panels
Energy-efficient lighting
Other energy-saving measures

These improvements may affect the information recorded during an EPC assessment.

Keep documents such as installation records, invoices and product information where possible. They may help provide useful evidence about improvements made to the property.

2. You Are Preparing to Sell

An updated EPC can be useful when preparing a property for sale.

You do not necessarily need a new EPC simply because you are selling. If your existing certificate is still valid, check it before arranging another assessment.

However, if you have made significant improvements since the previous EPC, you may want a newer certificate that reflects the property’s current features.

If you are selling a flat, you can also read our guide on EPC for Flats London: What Flat Owners Need to Know.

That guide explains EPC considerations for London apartments, including selling, renting, existing certificates and preparing for an assessment.

3. You Are Preparing a Rental Property

Landlords should check their property’s EPC before marketing it for rent.

If your property has recently been improved, an updated EPC may provide a more current record of its energy performance.

However, you should first check whether your existing certificate is still valid.

For current legal requirements and exemptions, always refer to the latest GOV.UK guidance on Energy Performance Certificates.

Which Home Improvements Can Affect an EPC?

Different improvements can affect the energy characteristics recorded for a property.

Insulation

Insulation can help reduce heat loss from a property.

If you have added loft, cavity wall or other insulation since your previous EPC, keep information about the work available.

Heating Systems

Replacing an older boiler or heating system can change the property’s energy characteristics.

Heating controls may also be relevant during an assessment.

Windows and Glazing

Replacing older windows with more efficient glazing can be another important improvement.

If you have recently replaced windows, keep the relevant installation information where possible.

Solar Panels

Solar panels and other renewable technologies can also be relevant to the property’s energy performance.

If solar panels have been installed since your previous EPC, tell the assessor about the installation.

Do You Need Proof of Your Improvements?

It is a good idea to keep records of major energy improvements.

Useful documents can include:

Boiler installation records
Window specifications
Insulation invoices
Solar panel installation documents
Product specifications
Building work records
Certificates relating to energy improvements

You may not need every document for an EPC assessment.

However, having relevant information available can make it easier to provide accurate details about the property.

What Happens During an Updated EPC Assessment?

An energy assessor collects information about the property and its energy-related features.

This can include areas such as:

Heating
Hot water
Windows
Insulation
Lighting
Construction characteristics
Renewable technologies

The assessor then uses the information collected to produce the EPC.

If you are arranging an assessment, it helps to make the relevant areas accessible.

For more preparation advice, read our guide on How to Prepare for an EPC, Photography and Floor Plan Appointment in London.

The guide covers access, heating systems, improvement information and other useful preparation steps.

Should You Get a New EPC Before Selling?

Not necessarily.

First, check whether your current EPC is still valid.

If it is valid, you may not need another assessment simply because the property is being sold.

However, an updated certificate may be worth considering if you have completed significant energy improvements since the previous assessment.

A newer EPC can give potential buyers more current information about the property’s energy performance.

What If You Have Renovated the Property?

Major renovations can make EPC considerations more complicated.

For example, you may have:

Converted a loft
Added an extension
Changed the layout
Converted part of a building
Replaced the heating system
Added insulation
Installed new windows
Added renewable technology

If your property has undergone substantial work, tell the assessor about the changes when arranging the appointment.

It is also useful to keep records of the work completed.

EPC and Property Marketing

An EPC is only one part of preparing a property for sale or rent.

You may also need professional photography and a floor plan.

Professional photography helps show the property’s condition and features.

A floor plan helps buyers and tenants understand the relationship between rooms.

If you are preparing a property for marketing, you can learn more about EPC, property photography and floor plan services.

You can also read How to Prepare for an EPC, Photography and Floor Plan Appointment in London for practical preparation advice.

What About Property Licensing?

Some landlords may need a floor plan when applying for a property licence.

The requirements can depend on the type of licence and the local authority.

Our recent guide, Floor Plan for Selective Licence in London: What to Include, explains some of the information that may need to be shown on a licensing floor plan.

This is separate from an EPC, but both documents can be part of preparing a rental property.

When Should You Consider an Updated EPC?

An updated EPC may be worth considering when:

You have made significant energy improvements.
Your current EPC is approaching expiry.
You are preparing to sell.
You are preparing to rent out the property.
You want a more current record of your property’s energy performance.
Your property has undergone major alterations.

There is no need to automatically replace an EPC every time you make a small improvement.

Start by checking your existing certificate and reviewing the changes made to the property.

EPC After Home Improvements: Simple Checklist

Before arranging an updated assessment, use this checklist.

Check Your Existing EPC

Find your current EPC.
Check the certificate date.
Check whether it is still valid.
Review the existing energy rating.
Review the recommendations.

List Your Improvements

Write down the major improvements completed since your previous assessment.

For example:

New boiler
New heating controls
Loft insulation
Wall insulation
Replacement windows
Solar panels
Energy-efficient lighting

Gather Supporting Information

Keep useful documents available.

These could include:

Invoices
Installation records
Product specifications
Certificates
Details of heating systems
Information about insulation

Prepare the Property

Make sure the assessor can access the relevant rooms and energy-related equipment.

Tell the provider about unusual layouts, extensions, conversions or access restrictions before the appointment.

Can an Updated EPC Improve Your Rating?

It is possible for a property’s rating to change after improvements, but the result depends on the property’s characteristics and the information recorded during the assessment.

An improvement does not guarantee a specific EPC rating.

The best approach is to make suitable energy improvements based on the property and then arrange an assessment when you need an updated certificate.

Final Thoughts

Getting an EPC after home improvements is not automatically required every time you upgrade your property.

Your existing EPC may remain valid. However, a new assessment can be useful when you want the certificate to reflect significant improvements made since the previous assessment.

Start by checking your existing EPC. Then consider the improvements you have completed and whether an updated certificate would be useful for your plans.

If you are preparing a London property for sale or rent, EPC Rate London can provide EPC services in London along with property photography and floor plan services.

You can also book EPC and property services if you need several services for the same property.

For current EPC rules, requirements and exemptions, always check the latest information available from GOV.UK.