Energy Cost Estimator
Estimate your annual energy costs based on EPC rating and property size. See how upgrading your EPC rating could reduce your bills.
Understanding EPC ratings and energy costs
An Energy Performance Certificate (EPC) rates a property's energy efficiency from A (most efficient) to G (least efficient). The rating directly affects your energy bills — a well-insulated property with modern heating (rated A or B) can cost less than half the energy bills of a poorly insulated one (rated E, F, or G).
Since April 2020, rented properties in England and Wales must have a minimum EPC rating of E. Properties rated F or G cannot legally be rented out without a valid exemption. The government has proposed raising this minimum to C for new tenancies from 2025, though implementation has been delayed.
The most cost-effective improvements are typically loft insulation, cavity wall insulation, and upgrading to a more efficient boiler. These can move a property from D to C or even B, saving hundreds of pounds per year.
Frequently asked questions
- How are energy costs estimated?
- Estimates are based on Ofgem typical domestic consumption values for 2025, adjusted by EPC rating. Better-rated properties use less energy. Costs are further adjusted by number of bedrooms, as larger properties use more energy for heating and lighting.
- What does each EPC rating mean in practice?
- A-rated homes are highly insulated with renewable energy features — typically £700/year or less. D is the UK average at around £1,500/year. F and G properties can cost £2,600–£3,200/year and are often draughty older homes with inefficient heating systems.
- How much can I save by improving my EPC rating?
- Moving from E to C could save around £800/year for a 3-bed home. The most cost-effective upgrades are insulation (loft and cavity wall), draught-proofing, and upgrading heating controls. Heat pumps and solar panels offer the biggest improvements but at a higher upfront cost.
- Is an EPC required when buying or renting?
- Yes. Sellers must provide an EPC before marketing a property. Landlords must have a valid EPC (minimum rating E) to let a property. An EPC is valid for 10 years. The certificate includes a list of recommended improvements and their estimated impact.
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