How to Improve Your EPC Rating: Practical Property Upgrades

If you want to improve an EPC rating, begin with the property you actually have rather than a generic list of upgrades. The most effective route depends on the building’s construction, existing insulation, heating system, controls and the evidence available to the assessor.

Your current Energy Performance Certificate is a useful starting point because it includes recommendations. The aim should be to understand those recommendations, prioritise sensible measures and avoid expensive work that creates new problems elsewhere in the building.

Start with the current EPC recommendations

Read the full certificate and note the recommended improvements, their indicative sequence and the potential rating shown. The recommendations are generated from the assessment, so they are more relevant than a generic internet checklist.

However, an EPC is not a detailed retrofit design. It does not replace investigation of damp, ventilation, structural condition or heritage constraints. If you are planning several interacting measures, use a whole-house approach rather than treating each recommendation in isolation.

1. Check insulation and heat loss

Reducing unnecessary heat loss can improve energy performance, but the right insulation measure depends on the building. Loft or roof insulation is often relatively straightforward where access and construction allow. Wall and floor insulation can be more complex, particularly in older buildings.

Before insulating, understand how moisture moves through the construction and how ventilation will be maintained. Adding insulation without considering condensation risk, existing damp or ventilation can lead to poor outcomes.

2. Review heating controls

Heating controls can be an important part of energy performance. The relevant solution depends on the installed system, but effective time and temperature control helps a heating system operate more appropriately.

If controls are old, incomplete or poorly located, ask a competent heating professional what is compatible with the system. Do not assume that a smart control alone will transform the EPC; it is one part of the overall assessment.

3. Consider the heating and hot-water system

The efficiency and type of fixed heating and hot-water systems can materially affect an EPC. Replacing equipment can be expensive, so decisions should be based on age, condition, compatibility with the building and long-term plans rather than the certificate score alone.

If a heating system is close to the end of its life, that may be an opportunity to compare options. For larger retrofit projects, consider the building fabric and heat demand before finalising a new system so that equipment is appropriately selected.

4. Improve glazing where appropriate

Glazing influences heat loss, comfort and draughts. Replacement may improve performance, but it is not always the first or most cost-effective measure. In conservation areas, listed buildings or properties with character windows, there may also be planning or heritage considerations.

Check the EPC to see how the current glazing is recorded. If modern windows are already installed but the certificate does not reflect them, make sure evidence is available at the next assessment if the feature cannot be verified adequately on site.

5. Use low-energy fixed lighting

Fixed low-energy lighting is one of the simpler features an EPC can record. It is unlikely to compensate for major fabric or heating weaknesses, but it can form part of the overall improvement picture.

6. Consider renewable technologies in context

Solar PV and other technologies can influence assessed performance where they are applicable and correctly recorded. They should still be considered as part of the property’s wider energy strategy rather than installed solely to chase a letter grade.

Roof condition, orientation, shading, electrical capacity, planning and expected use all matter. Get appropriate technical advice before committing to a system.

Keep evidence of completed work

This is one of the most overlooked steps. An assessor may not be able to see concealed insulation or confirm the specification of an improvement after finishes have been reinstated. Keep installation certificates, invoices, product details, building-control records and guarantees where relevant.

Good records do not automatically increase a rating, but they can allow the assessor to record genuine features accurately rather than relying on conservative default assumptions.

Should you get a new EPC after improvements?

A new EPC can be useful if you have completed meaningful upgrades and want the certificate to reflect the current property. Whether you actually need a new certificate depends on why you require it and whether a valid EPC already exists.

If the property is being sold or rented, check the current rules. If the aim is simply to see whether works changed the rating, a new assessment is the way to obtain an updated official certificate.

Improving an EPC rating for a rental property

For covered domestic private rented properties in England and Wales, the current Minimum Energy Efficiency Standard generally requires an EPC rating of E or above unless a valid exemption applies. If a rental property is F or G, read the latest government MEES guidance before deciding what work is required.

The government is considering longer-term standards, so landlords should distinguish current law from future policy proposals and consultations.

When a retrofit assessment is more useful than an EPC alone

An EPC is designed to certify energy performance. A retrofit assessment can be more appropriate when you are planning a package of improvements and need a deeper understanding of the property. It can help frame decisions around condition, occupancy, ventilation and improvement options.

For complex or older homes, that broader view can reduce the risk of solving one problem while creating another. Read more about our retrofit assessment service.

A sensible order of work

There is no universal sequence for every property, but a good approach is to diagnose first, deal with defects, understand ventilation, review fabric improvements, then consider heating and renewable technologies in the context of the reduced energy demand. The current EPC can inform that process, but it should not be the only document guiding a major project.

For personalised next steps, start by checking your current EPC. If you then need a new assessment or retrofit advice, send the property details.

Official home energy guidance

The UK government provides a home energy improvement service for properties in England and Wales, including recommendations based on property details. Use current official information and qualified advice for major decisions.