Check a property's EPC rating before arranging a viewing. Energy efficiency affects running costs, mortgage options and potential future requirements for owners and landlords.
An Energy Performance Certificate, or EPC, is an assessment of a property's energy efficiency. It is a legal requirement to have a valid EPC when selling or renting a residential property in England, Wales and Scotland. The certificate rates the property on a scale from A to G, where A is the most efficient and G is the least.
The rating is based on factors including the property's insulation, heating system, windows, hot water system and the age and construction of the building. An EPC also shows the potential rating the property could achieve if recommended improvements were made, such as installing cavity wall insulation, upgrading the heating system or fitting double glazing.
An EPC gives you a snapshot of a property's energy performance at the time of the last assessment. It helps you understand how much the property is likely to cost to heat and what improvements might increase its efficiency.
EPC certificates are valid for ten years. An older certificate may not reflect improvements made since it was lodged, or changes to the property's condition. Always check the date of the certificate when reviewing EPC information.
EPC ratings explained
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Bands A and B: Excellent
Score of 69 or above. Highly energy efficient properties with very low running costs. Typically modern new builds, recently retrofitted homes, or properties with renewable energy systems.
Very low energy bills
Often eligible for green mortgage rates
Typically well insulated throughout
May have solar panels or heat pumps
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Bands C and D: Average
Score of 39 to 68. The most common rating range for UK homes. Properties with reasonable insulation and heating. Band C has been proposed as a future minimum standard for rental properties, subject to legislation.
Reasonable energy efficiency
Moderate energy bills
Improvement potential usually exists
Band C is the rental minimum target
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Bands E, F and G: Poor
Score of 38 or below. Properties with poor insulation, older heating systems or significant heat loss. Higher running costs and may require substantial improvement work.
Higher energy bills
May not meet future rental standards
Retrofit costs can be significant
Older and traditionally built properties most common
Why check the EPC before viewing a property
EPC information is publicly available and legally required to be disclosed when a property is marketed. In practice, it is often buried in the legal pack or presented as a single letter on the listing without context. Understanding what the rating means for running costs and future improvement requirements is worth doing before you commit to a viewing.
For buyers who are sensitive to energy costs, a property with a low EPC rating represents an ongoing financial commitment in the form of higher heating bills. For buyers considering a property with a view to renting it in future, a Band F or G rating is particularly relevant given proposed — and not yet enacted — minimum energy efficiency standards for rental properties. The retrofit costs required to achieve that uplift should be factored into any investment assessment.
Knowing the EPC rating before a viewing also helps you ask the right questions. If the rating is lower than expected, you can enquire about the age of the heating system, the insulation specification, and whether any improvements are planned or have been made since the last assessment.
Current and potential EPC ratings
Every EPC includes both a current rating and a potential rating. The current rating reflects the property as assessed. The potential rating shows what could be achieved if the recommended improvements listed in the certificate were implemented.
The gap between current and potential rating varies considerably. A property currently rated E with a potential of B has significant scope for improvement and the retrofit path is likely to be achievable. A property rated E with a potential of D may have structural constraints that limit how much its efficiency can be improved.
South Facing Garden shows both the current and potential ratings in the property report so you can see not just where the property stands now but where it could reach with investment.
How energy efficiency affects running costs
The EPC rating provides a useful indication of likely energy costs, though actual bills depend on how the property is used, the occupants' habits, and energy prices at the time. The Energy Performance Certificate itself includes estimated annual energy costs to give buyers a clearer sense of the financial difference between ratings.
The difference in annual heating costs between a Band C and Band E property can amount to several hundred pounds per year at current energy prices. Over a ten or twenty year ownership period, this difference compounds significantly. For buyers comparing two otherwise similar properties, the EPC difference is a meaningful factor in the overall cost of ownership.
Example
Two similar properties, different EPC ratings. Property A is a 1990s semi-detached rated Band C (score 72). Property B is a 1930s semi-detached on the same street rated Band E (score 44). Both are listed at similar prices. Based on typical energy use figures, The difference in annual heating costs between the two properties can be significant over time, particularly with older heating systems and limited insulation, and is worth factoring into any comparison of the total cost of ownership.
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How South Facing Garden presents EPC information
When you search an address in South Facing Garden, the property report includes the current EPC rating and score, the potential rating, and the date of the last assessment. This is presented alongside the other 12 categories in the report so you can assess energy efficiency in the context of the full property picture rather than in isolation.
The EPC information in South Facing Garden is sourced from the official EPC register. South Facing Garden does not carry out EPC assessments and the information presented is not a substitute for the official certificate. For formal purposes, including conveyancing, mortgage applications and compliance with legal requirements, always rely on the official EPC certificate lodged with the government's Energy Performance Certificate register.
You can access the official register and search by address at the government's Find an Energy Certificate service. South Facing Garden makes the information available as part of early property research, helping you understand the energy position of a property before deciding whether to arrange a viewing rather than discovering it during conveyancing.
Please note: EPC information in South Facing Garden is sourced from the official EPC register and is presented as an early research tool. South Facing Garden does not replace the official EPC certificate. Always obtain and review the official certificate as part of your conveyancing process.
South Facing Garden includes the EPC rating for UK residential properties as part of every free property report. Enter any address and the report shows the current EPC rating and score alongside the potential rating if recommended improvements were made. EPC certificates are also publicly searchable via the government's Find an Energy Certificate service, which holds the official register of all lodged EPCs.
EPC ratings run from A to G. A is the most energy efficient and G is the least. In practice, most properties in England and Wales fall between bands C and E. Band A and B properties are generally very well insulated, modern or recently retrofitted homes. Band F and G properties have poor energy efficiency and are typically older properties without modern insulation or heating systems.
Generally yes. A property with a lower EPC rating tends to cost more to heat because the building loses heat more quickly through poor insulation, drafts or inefficient heating systems. The difference in running costs between a Band C and a Band E property can be significant over a year, particularly with current energy prices. This is worth factoring into your assessment of the overall cost of ownership when comparing properties.
Some lenders now offer green mortgage products with preferential rates for properties with higher EPC ratings, typically Band C or above. Proposed government legislation would also require rental properties Future minimum energy efficiency requirements for rental properties remain subject to government policy and legislation. Buyers and landlords should check the latest official guidance before making purchase decisions based on projected requirements. For residential buyers, a low EPC rating does not currently prevent you from obtaining a mortgage, but it is a factor some lenders consider in their overall risk assessment.
The EPC gives a useful indication of energy efficiency based on the features of the property assessed at the time of the survey, such as insulation, heating system, windows and hot water. It does not account for how the occupants use the property or for improvements made after the certificate was lodged. EPC certificates are valid for ten years and an older certificate may not reflect the current state of the property. Always check the date of the certificate.
No. South Facing Garden presents EPC information from the official EPC register as part of the property report, to help you understand the property's energy efficiency before arranging a viewing. The official EPC certificate, lodged with the government's Energy Performance Certificate register, is the authoritative document and is what you should rely on for formal purposes. You can access the official register at gov.uk.
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