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What Are U Values?

When conducting research on any types of window or roofing lantern you will probably encounter the term ‘U Values’ on a regular basis.

Here at Clearview we use the term daily but we are conscious that some people may not have heard the term, or know exactly what it means. Therefore, we thought we would explain what the U Value is, and outline how it impacts on you and your home.

The U Value essentially measures the thermal efficiency of the glass. It’s definition is ‘the transfer of heat (in watts) through 1 square metre of glass divided by the difference in temperature across the structure’.

What this means when translated into real terms is the lower the U Value the more thermally efficient your window/door will be (lower = less heat escaping). The better (lower) the U Value the warmer your home will be, ultimately providing cost saving benefits on your energy bills.

It is for the above reasons alone that people are concerned with the U Value, especially when dealing with large sliding doors, bi-folding doors or roof lanterns. If your new window is small then the U Value will have minimum impact. However, our sliding and bi folding doors and roofing lanterns are generally large panes of glass which means that without the correct glazing and technical properties they could potentially be thermally inefficient.

Thankfully, home owners in the UK do not need to worry about the U Value too much, as they are closely governed by building regulations outlined in the Conservation of Fuel and Power. These regulations set a maximum U Value which can be used in a building. This includes extensions and renovations.

It is important to recognise these building regulations as there are standards that each building must adhere to. If the U Value of your doors and windows is better (lower) then this will enable you to have larger doors and windows installed, bringing you closer to your design ideals.


To find out more about U Values, or about the products and services that Clearview provides, feel free to call us on 0800 1357167. 

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