The GGF Energy Savings Calculator provides estimates for energy bill savings you may receive by installing [ Our/Our Members] energy-efficient windows. We make no express or implied warranties in connection with using the calculator tool. The savings identified are based on the information you provide, using a number of assumptions to provide you with the best estimate of potential benefits.

You must ensure information provided for estimates is correct and the Calculator assumes that you have taken all other practical measures to optimise the energy efficiency of your home, such as cavity wall and loft insulation, as well as the installation of an energy efficient heating system.

Use of the Calculator and its results is not a guarantee that you will see the exact same savings from the installation of energy-efficient windows. We shall not be liable for any errors, assumptions resulting from the estimate given which are outside our control. Please note that no allowance has been taken for the introduction of additional background ventilation which may be required to comply with the latest edition of Building Regulations Approved Document F - Ventilation (2022)