How to Improve Your EPC Rating in London: Practical Steps

If your London property has a low Energy Performance Certificate (EPC) rating, you may be wondering what you can do to improve it.

An EPC provides an energy efficiency rating from A to G and includes recommendations that may help improve the property’s energy performance. The most suitable improvements depend on the property, its construction and the systems already installed.

Older homes can require a different approach from newer properties. This is particularly important in London, where properties can range from Victorian and Edwardian houses to modern flats and converted buildings.

This guide explains practical ways to approach improving an EPC rating in London, what information can be useful, and what to consider before arranging another assessment.

What Does an EPC Rating Mean?

An EPC gives a property an energy efficiency rating from A to G.

A is the highest rating, while G is the lowest.

The certificate also provides information about the property’s energy performance and recommendations for potential improvements.

If you already have an EPC, start by reading the recommendations rather than immediately replacing equipment or carrying out major building work.

The recommendations can help you understand which improvements may be relevant to your property.

You can also check an existing certificate using the official GOV.UK Find an Energy Certificate service.

Can You Improve an EPC Rating?

Yes, improvements to a property’s energy efficiency can potentially affect its EPC rating.

However, there is no single upgrade that will improve every property by the same amount.

The effect can depend on factors such as:

• Property age

• Property construction

• Wall type

• Roof construction

• Existing insulation

• Windows and glazing

• Heating system

• Hot water system

• Lighting

• Renewable energy systems

• Existing energy-efficiency measures

For this reason, it is useful to review the existing EPC before deciding which improvements to make.

1. Check Your Existing EPC First

Before spending money on improvements, find your current EPC.

Check:

• The current EPC rating

• The certificate date

• The estimated energy performance

• The recommendations

• The property details

• Any information about existing insulation or heating

An EPC is generally valid for 10 years unless a newer EPC has been produced for the property.

If you are unsure what information you should keep, our guide to EPC Documents London explains the paperwork and property information that can be useful when dealing with an EPC.

Starting with the existing certificate can help you avoid making assumptions about the property’s energy performance.

2. Look at Loft and Roof Insulation

Heat can escape through the roof of a property when insulation is inadequate.

Improving loft insulation may therefore be one of the measures worth considering for a suitable property.

The appropriate insulation level depends on the building and existing construction.

Before carrying out work, check the existing condition of the roof space and consider getting suitable professional advice.

This is particularly important for older properties where the roof construction may differ from modern buildings.

If your property is an older London home, our guide to EPCs for Older Properties in London provides more information about the considerations that can apply to period and older buildings.

3. Consider Wall Insulation

Wall construction can have a significant effect on the energy performance of a property.

Some homes have cavity walls, while many older London properties have solid walls.

The appropriate improvement can therefore vary considerably.

For example, an insulation approach suitable for a modern cavity-wall property may not be appropriate for an older solid-wall building.

Before making changes, identify the construction type and consider whether the proposed work is suitable for the building.

This is especially important for period properties where changes to walls can affect moisture movement, ventilation and the appearance of the building.

4. Review Your Windows

Windows are another part of the building that can affect energy performance.

If your property has older single-glazed windows, replacing them with suitable energy-efficient glazing may be one possible improvement.

However, replacement is not automatically the right choice for every property.

Older and listed buildings can require additional consideration.

For example, replacing original windows in a period property may affect its character or require permission depending on the building and location.

If you own an older property, check the relevant requirements before carrying out major changes.

5. Review the Heating System

Heating is an important part of a property’s energy performance.

If your heating system is old or inefficient, upgrading it may be worth considering.

Possible improvements can include:

• Replacing an inefficient heating system

• Improving heating controls

• Installing suitable thermostatic controls

• Improving hot water controls

• Maintaining existing equipment

• Considering a more efficient heating system where appropriate

The right option depends on the property.

A heating upgrade should therefore be considered alongside the property’s insulation, hot water system and overall construction.

6. Improve Heating Controls

You may not always need to replace the entire heating system.

Improving controls can also help manage how and when the property is heated.

Depending on the system, this could include suitable thermostats, timers or thermostatic radiator controls.

Better control can help prevent unnecessary heating and give occupants more control over different rooms and heating periods.

However, the EPC impact will depend on the specific property and the assumptions used during the assessment.

7. Look at Hot Water Efficiency

Hot water systems can also contribute to a property’s energy use.

Check the existing hot water system and insulation.

For example, suitable insulation around hot water storage and pipes may help reduce heat loss.

If you are replacing a hot water system, consider its energy efficiency alongside the requirements of the property.

Do not assume that a particular product will automatically produce a specific EPC improvement.

8. Consider Energy-Efficient Lighting

Lighting is another area that can be reviewed.

Replacing older inefficient lighting with suitable energy-efficient alternatives may help reduce electricity consumption.

It can also be a relatively straightforward improvement compared with major building work.

When preparing for an EPC assessment, make sure the assessor can access the relevant lighting and other areas of the property.

9. Consider Renewable Energy

Some properties may benefit from renewable energy technologies such as solar photovoltaic panels.

However, suitability varies from property to property.

Before installing renewable technology, consider:

• Roof orientation

• Available roof space

• Shading

• Roof condition

• Installation costs

• Planning considerations

• Building restrictions

• Expected energy use

For listed or particularly old properties, additional restrictions may apply.

It is therefore worth checking the building’s circumstances before committing to major work.

Why Older London Properties Need Extra Care

Older London properties can have construction features that differ significantly from modern homes.

Examples include:

• Solid masonry walls

• Original timber windows

• Older roof structures

• Period features

• Older heating systems

• Limited insulation

• Extensions added at different times

• Converted spaces

These features can make energy-efficiency improvements more complicated.

An improvement that works well in a modern property may not be suitable for an older building.

Our detailed guide on EPCs for Older Properties in London explains some of the issues property owners should consider before arranging an assessment or making improvements.

Keep Evidence of Energy Improvements

If you have already made energy-efficiency improvements, keep the relevant paperwork.

Useful documents may include:

• Boiler installation records

• Heating system information

• Window installation documents

• Insulation certificates

• Solar panel information

• Product specifications

• Building work records

• Invoices

• Guarantees

• Installation certificates

• Planning or building-control documents where relevant

Keeping these documents together can make it easier to provide useful information about the property.

Our EPC Documents London guide explains what property owners should consider keeping for their EPC records.

Do EPC Improvements Guarantee a Higher Rating?

No.

An improvement does not guarantee a particular EPC rating.

The final rating depends on the assessment of the property and the information used in the calculation.

For example, installing one new feature does not necessarily mean that the property will move from one EPC band to another.

The best approach is to review the recommendations on the existing EPC and consider suitable improvements for the specific property.

Should You Improve the Property Before a New EPC?

It depends on your circumstances.

If you have already completed energy-efficiency improvements, you may want to arrange a new EPC so that the property’s current features can be assessed.

However, if the existing EPC is still valid, you do not automatically need a new certificate simply because you have made an improvement.

If you are preparing the property for sale or rent, check the current requirements and decide whether a new assessment is appropriate.

GOV.UK states that an EPC is generally valid for 10 years and can be reused during that period unless a newer EPC has been produced.

What Documents Should You Give Your Assessor?

If you have documentation relating to energy improvements, keep it available for the assessment.

This could include:

• Boiler documents

• Heating installation certificates

• Insulation records

• Window documentation

• Solar installation information

• Product specifications

• Relevant building work documents

• Previous EPCs

Not every document will necessarily be required.

However, having accurate information available can be useful when the assessor is reviewing the property.

For more information, see our EPC Documents London guide.

What If Your Property Is Exempt From an EPC?

Some properties may not require an EPC because they fall within specific exemption categories.

For example, GOV.UK currently lists certain temporary buildings, small stand-alone buildings, some industrial and agricultural buildings, certain holiday accommodation, places of worship and qualifying listed buildings among the circumstances where an EPC may not be required.

However, an exemption depends on the circumstances.

Being an older property does not automatically mean that it is exempt.

Likewise, being a listed building does not automatically mean that an EPC is unnecessary in every situation.

You can read our detailed guide on EPC Exemptions London before deciding whether your property falls within an exemption.

If there is uncertainty, check the latest government guidance and consider obtaining appropriate professional advice.

Check Your EPC Before Marketing Your Property

If you are preparing to sell or rent your London property, check the EPC early.

GOV.UK states that an EPC is generally required when selling or renting a property, subject to applicable exemptions, and that it must be ordered before the property is marketed.

A simple preparation process can be:

1. Find your existing EPC.

2. Check its date and rating.

3. Review the recommendations.

4. Check whether the property has completed energy improvements.

5. Gather supporting documents.

6. Determine whether a new assessment is required.

7. Arrange an accredited assessor if necessary.

8. Prepare your other property marketing materials.

This can help prevent the EPC from becoming a last-minute task.

Prepare Your Other Property Marketing Materials

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

You may also need:

• Professional property photography

• A clear floor plan

• An accurate property description

• Property measurements

• Property details

• Availability information

EPC Rate London also provides professional property photography and professional floor plans for property marketing.

The Book Your Services page also allows customers to enquire about combining EPC, floor plan and property photography services.

When Should You Arrange a New EPC?

Consider checking your EPC before making a booking.

You may already have a valid certificate.

If your certificate has expired or your property does not have a valid EPC when one is required, you may need a new assessment.

GOV.UK recommends using an accredited energy assessor when obtaining an EPC.

You can also read our guide on How Long Does an EPC Assessment Take in London? to understand what to expect during the assessment.

Frequently Asked Questions

How can I improve my EPC rating in London?

Start by reviewing your existing EPC recommendations. Depending on the property, improvements may involve insulation, heating, hot water, windows, lighting or renewable energy.

What is the easiest way to improve an EPC rating?

There is no single improvement that works for every property. Review the existing EPC recommendations and consider the property’s construction, heating and insulation before choosing improvements.

Can new windows improve an EPC rating?

Energy-efficient windows may contribute to improved energy performance, but the effect depends on the property and the existing windows.

Can insulation improve an EPC rating?

Suitable insulation can improve a property’s energy efficiency. The appropriate type and installation method depend on the property’s construction.

Do I need documents for an EPC assessment?

You should keep relevant documents about previous energy improvements available where possible. These can include boiler, insulation, heating, window and renewable-energy documentation.

Does an older property automatically need a special EPC?

Older properties are assessed under the applicable EPC methodology, but their construction can present different considerations. Being old does not automatically make a property exempt from EPC requirements.

Is a listed building automatically exempt from an EPC?

No. GOV.UK provides specific circumstances in which a listed building may be exempt. The exemption depends on whether meeting the relevant minimum energy performance requirements would unacceptably alter its character or appearance.

How long is an EPC valid?

An EPC is generally valid for 10 years unless a newer EPC has been produced for the property.

Can I arrange an EPC with photography and a floor plan?

Yes. EPC Rate London provides options for EPC, property photography and floor plan services. You can enquire through the Book Your Services page.

Final Thoughts

Improving your EPC rating starts with understanding the property you already have.

Check the current EPC, review its recommendations and identify any energy-efficiency improvements that may be suitable.

For older London properties, take extra care before changing walls, windows, insulation or other parts of the building. The construction and character of the property can affect which improvements are appropriate.

Keep documents for completed work and make them available when useful. These records can help you keep better property information for future assessments.

If you need a new EPC, check whether your existing certificate has expired and use an accredited assessor.

For properties being prepared for sale or rent, you can also organise the EPC alongside professional photography and a floor plan to prepare the main marketing materials together.

For the latest EPC requirements and exemptions, always check the official GOV.UK Energy Performance Certificate guidance.