It tells you how energy efficient a property is and gives it a rating from A to G (an 'A' rating being very efficient).

It is created using information gathered from your existing Energy Performance Certificate (EPC) when a property has one and other survey data from the homes in your neighbourhood.

The rating is created using information gathered from your existing EPC and other survey data from homes in your neighbourhood, giving you an estimated energy efficiency rating. To get an up-to-date official EPC rating please visit the government website for England and Wales, for Scotland.

The energy costs are updated monthly based on the current price that the public are paying, the savings also reflect the difference in energy prices.

The estimated energy cost for your home shows the average household spend for heating, hot water and lighting (and does not include other devices such as laundry and cooking). It is based on assumed occupancy, fuel costs and efficiencies of the systems being used. 

The estimated carbon footprint for your home is based on assumptions of average occupancy and energy use. It takes the assumed carbon for the fuel being used in your home and multiplies it by the energy use.

To calculate the savings from the home improvements, we take the total energy savings based on the home improvement (energy cost of the original estimated efficiency rating) and minus the energy costs of the new estimated efficiency rating, once the home improvements have been made cumulatively. This equals the total energy savings. The improvements are cumulative that is, they assume the improvements have been installed in the order that they appear as the first action is the most impactful you could make.