Understanding EPC Ratings A to G

What the letter represents

For a domestic EPC, the energy-efficiency rating is calculated using the building and its services under standard assumptions. It is related to modelled energy costs rather than being a direct reading of the owner's meter. Homes with different occupants can therefore be compared on a more consistent basis.

A band covers a range of scores. Two D-rated homes are not necessarily identical, and a small calculated change may cross a band boundary for one home but not another. Avoid judging an improvement solely by whether it changes the letter.

Current versus potential performance

The current rating describes the assessed property. The potential rating illustrates the result of an improvement scenario. It does not certify that the recommended measures have already been installed, or guarantee that every measure is suitable without further investigation.

Read the recommendations in their stated order and context. Their calculated effect can be cumulative. Do not add separate savings together or assume the final potential score will follow from installing only the first item.

Energy costs and actual bills

The certificate's cost information is based on the model and its assumptions. Your bills depend on tariffs, weather, how much space you heat and how the building is used. A household that is out all day may have different consumption from one using the same home continuously.

Use the EPC to understand the building and compare possible improvements. For a personal budget, also consider actual meter information, tariffs and occupancy rather than treating the certificate as a bill forecast.

Reading the feature descriptions

Review the recorded walls, roof, windows, heating and other features. If you have evidence of an improvement that seems absent, raise the specific point with the assessor. Some elements are difficult to inspect, so acceptable evidence can be important.

An EPC is not a condition survey. A feature's energy description does not establish whether it is structurally sound, properly maintained or free from damp. Investigate those issues through the appropriate professional inspection.

Ratings and letting requirements

A low rating does not mean every property is subject to the same legal restriction. The minimum letting standard depends on the building and tenancy being within scope, and valid exemptions can apply. For covered rentals the current guidance uses E as the minimum.

Read minimum EPC ratings for renting for the distinction between present duties and announced reforms. The potential rating cannot be used as though it were the current rating for compliance.

Domestic and commercial certificates

Non-domestic EPCs use a different assessment approach and a headline measure based on modelled carbon emissions. Do not compare a shop's numerical result directly with a house's score as if they were the same calculation.

For mixed-use premises, establish the relevant units and certificates. Our residential and commercial comparison explains why a single street address may involve more than one assessment scope.

Frequently asked questions

Is A always achievable for an existing home?

Do not assume so. Construction, constraints, suitable measures and the assessment method all matter. A practical plan should be based on the actual building.

Is a C rating a guarantee of low bills?

No. It is a modelled rating, not a guarantee of a household's spending.

Should I choose improvements from the certificate alone?

Use it as a starting point and investigate suitability, condition and permissions. Read our improvement guide before commissioning substantial work.

Can I get an EPC in Solihull?

Visit EPC services in Solihull or request an assessment quote with your property details.