EPC Rating Estimator

An Energy Performance Certificate (EPC) rates a property's energy efficiency from A (most efficient) to G (least efficient). EPCs are legally required when selling, renting or building a property in England, Wales and Northern Ireland. The certificate is valid for 10 years.

EPC scores are calculated using the Standard Assessment Procedure (SAP) which considers the property's construction, heating system, insulation, ventilation, lighting and renewable energy sources. The score ranges from 1 to 100, with higher numbers being more efficient.

Since April 2020, all rental properties in England and Wales must have a minimum EPC rating of E. The government has proposed raising this to C for new tenancies from 2025 and all tenancies from 2028, though timelines may shift. Landlords who fail to comply face fines up to £5,000.

A qualified Domestic Energy Assessor typically charges between £60 and £120 for an EPC assessment. Prices vary by property size and location. The assessment takes 45 to 90 minutes and includes an inspection of the property's heating, insulation, windows and construction.

The most cost-effective improvements are typically loft insulation (can add 5-10 points), cavity wall insulation (5-10 points), upgrading the boiler to a modern condensing model (5-10 points), and installing a smart thermostat. Solar panels can add 10+ points but at higher cost.

Yes, you can sell a property with any EPC rating, but you must have a valid EPC available to prospective buyers. A low rating may reduce the property's appeal and value. Estate agents must display the EPC rating in property listings.

Yes, replacing an old boiler with a modern A-rated condensing boiler can improve your EPC score by 5 to 15 points depending on the age and efficiency of the old boiler. Adding heating controls such as a programmer, room thermostat and TRVs adds further points.

Heat pumps significantly improve EPC ratings because they are rated at 250-400% efficiency compared to 90% for gas boilers. An air source heat pump can improve your score by 10-20 points. The Boiler Upgrade Scheme offers a £7,500 grant towards installation costs.

Yes, a typical 4kW solar PV installation can improve your EPC score by 5-15 points depending on the property. The impact is greater on smaller properties. Solar panels also reduce energy bills and generate income through the Smart Export Guarantee.

This tool provides an indicative estimate based on key property characteristics. Actual EPC ratings are determined by a qualified assessor using the full SAP methodology which considers many more factors. Use this as a guide and commission a real EPC for official purposes.