Home Blog What are so called Eco-Friendly windows and doors?

What are so called Eco-Friendly windows and doors?


Your choice of replacement windows and doors for your home or new ones for an extension can now make a real difference to both your property and the world around you.  How?  Well, according to the Energy Saving Trust, nearly a fifth of heat lost from an uninsulated home can be through the windows.  By making a significant reduction to the amount of heat lost through your windows and doors you will be reducing the amount of energy you use to keep your home warm, therefore saving you money. The technology used to design modern energy rated replacement windows and doors has tackled the key issues that have a major impact on how effective your windows and doors are at keeping your home warm. The main consideration has been to reduce the heat that can be lost through poorly insulated windows and doors.

Many homeowners will realise that there are variations in the quality of windows and doors available today, but few may realise the vast differences in how well they insulate and what a difference this can make. Each part of a window or door contributes to its overall insulation.  From the quality and design of the seals; to the thermal performance of the frames and to the type of double glazed unit used – all have their part to play. Windows and doors that have the largest expanse of glass will naturally allow more light into your home and therefore benefit from ‘solar gain’.  Heat gained in this way reduces your reliance on central heating to warm your home. By choosing the best performing windows and doors you can help to make a real difference and save money for years to come.

To help consumers recognise the best window systems, the Government introduced “Window Energy Ratings” (WER’s)  under the guise of the British Fenestration Rating Council (BFRC) to make it easier for UK homeowners to identify the most energy-efficient windows.

In the same way that fridges, freezers, washing machines and other household appliances carry the widely recognised energy efficiency labels, the windows you buy for your home will now also feature a similar labelling system. Window Energy Ratings can be applied to any window system that has been fully independently assessed.  This assessment gives each window system a rating – where ‘A’ is the most energy efficient and ‘G’ is the least.  Homeowners that want the most energy efficient windows should opt for the highest Window Energy Rating possible.

The Energy Saving Trust also recommends that home-owners look for their accreditation which is only awarded to those windows that achieve a Window Energy Rating of ‘C’ or above, the minimum legal standard that property owners and installers must now adhere to under the new Building Regulations that came into effect on 1st October 2010. All replacement windows and doors must comply with these new higher thermal efficiency standards, and be certificated as proof of compliance. FENSA will not issue a certificate to home owners who knowingly install non-compliant products to save money, nor in cases where double glazing installers fit non-energy rated products. Obviously, all new build fenestration products also have to meet the new legally required higher standards as set out in the current Building Regulations.

Concern over the environment is making homeowners far more aware than ever of the value of energy efficient windows.  Hazlemere only offer “A” rated UPVC windows and a choice of “A”, “B” or “C” rated aluminium windows. Window Energy Ratings are the clearest indication of how well a window system performs in terms of insulation.  Quite simply, the higher the rating the more energy efficient the window is. All replacement windows must now be “C”, “B” or “A” rated products or have a maximum combined U-Value of 1.6 W/m2K (the lower the U-Value the greater the thermal efficiency). Replacement doors meanwhile must now have no more than a maximum combined U-Value of 1.8 W/m2K

Hazlemere manufacture, supply and install exciting range of Energy Saving Trust and BFRC approved environmentally friendly bespoke windows that all have a Window Energy Rating of “C” or greater, as don’t manufacture, sell or install anything less.  So, whichever system you decide is right for your home you can be assured that it will offer superb thermal performance that will help you to save energy and money on your heating bills too.


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Credit is subject to status and affordability. Terms and conditions apply. Finance on windows & doors is available to a maximum loan value of £50,000 with zero deposit. Finance on conservatories is available to a maximum loan value of £30,000 with a 15% deposit. £1,000 minimum order value applies to all finance options. Authorised and regulated by the Financial Conduct Authority. Hazlemere Window Company Limited (VAT No. GB 135 5828 01) at Cressex Business Park, Wellington Road, High Wycombe, Buckinghamshire HP12 3PR (Financial Services Registered No. 796507) is a credit broker and is authorised and regulated by the Financial Conduct Authority. Credit provided by Hitachi Personal Finance, a trading style of Hitachi Capital (UK) PLC, authorised and regulated by the Financial Conduct Authority (Registered No. 704348).