Energy Performance Certificates: what your rating means and how to improve it

An EPC rates your property from A (most efficient) to G (least efficient). The rating is calculated based on the energy use per square metre of the property, the carbon dioxide emissions, and the cost of energy to heat and power the home. The average UK property sits in band D. An A-rated home costs roughly half as much to heat as a D-rated one, and around one-third of a G-rated property. EPCs also include estimated energy costs and recommendations for improvements, ranked by cost-effectiveness. The certificate must be produced by a qualified domestic energy assessor, and costs typically range from £60 to £120 depending on property size and location.

Your EPC rating has a direct and measurable impact on your household finances in several ways. First, running costs: moving from an F to a C rating could save £200 to £400 per year on energy bills. Second, mortgage availability: some lenders offer green mortgage deals with better rates for more energy-efficient homes. Third, property value: research consistently shows that higher-rated properties command a premium. Fourth, rental regulations: by 1 October 2030, privately rented homes in England and Wales must meet a standard equivalent to EPC C, so landlords should plan upgrades early.

Some improvements offer excellent value for money and can be done quickly. Loft insulation to 270mm depth is one of the most cost-effective steps, potentially adding one or two rating bands. Switching to LED bulbs throughout the property is low-cost and immediate. Adding draught proofing around doors, windows, and floorboards is inexpensive and makes a noticeable difference to comfort. Cavity wall insulation, if not already present, is heavily subsidised under the Great British Insulation Scheme. For larger improvements, consider upgrading your heating system or installing double or triple glazing. An EPC assessor will model the impact of each improvement before you spend money, helping you prioritise.