The average window area for a is m2. If you think the window area of your is more or less than this amount, please use the slider below to adjust the amount.
The Energy Savings Calculator only provides estimated potential savings resulting from the replacement of older windows with more energy efficient windows.
The following formula is used to calculate any potential cost and CO2 saving (Hover over the formula to get specific details)
The table below are the values which are used for the current heating system, including the cost of the kWh and the heating efficiency. Gas and Electricity usage figures are taken from British Gas and are accurate as of April 2024 and are based on a dual fuel customer with average consumption of 11,500 kWh for gas and 2,700 kWh for single-rate electricity - paying by Direct Debit. Oil and Coal prices are accurate as of November 2022