The public interest registry for energy double glazing.

How much money can I save from energy efficient windows?

Energy rated windows help you save money this year, next year and every year.

The exact amount of money saved will depend on a variety of factors, such as the specification of window you choose, and the type of window being replaced.

Case studies

TV presenter James Strawbridge, eco-campaigner and spokesperson for the British Fenestration Rating Council (BFRC).

According to the Saint-Gobain Group, one of the UK's leading glazing suppliers, one can see that replacing single glazing with A-rated double glazing could save you 8,211 and 22 tonnes of CO2 in a typical detached house, or 5,855 and 16 tonnes of CO2 in a typical semi-detached house, by using the Glass and Glazing Federation's energy saving and carbon calculator.1

The study calculated gas central heating savings across a 20-year period, factoring in gas costs rising an average of 6% per year reflecting typical annual inflation.

Pilkington, another leading glazing specialist, state a typical semi-detached house could save over 10,000 over a 20 year period2 (based on 10% energy costs increase per annum).

Go to and use the GGF carbon calculator for more detailed calculations. Select glazing, frame material, house and heating type. You can calculate how much money, energy and CO2 can be saved on each installation.

According to Energy Savings Trust, an average household installing Energy Saving Recommended windows can typically cut carbon dioxide emissions by approximately three-quarters of a tonne per year. This is a significant saving, as around 23% of the heat lost from an average home occurs through the windows.

One of a number of national schemes used for rating the energy efficiency of windows, the British Fenestration Rating Council (BFRC) states that by installing energy efficient windows you can save and reduce your household bills by up to 461 per year.3

TV presenter James Strawbridge is spokesperson for the BFRC, and as an eco-campaigner asked the public to "save heat and money by opting for BFRC-rated Energy Efficient Windows."


1. Save Energy & Save Money - SGG Swisspacer
2. Stop Your Money Going Out of the Window - Pilkington energiKare
3. A Quick Guide to Energy Efficient Windows for Homeowners - BFRC

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