The Real Advantages of Double Glazing…

For many households, having double glazing installed is a key way of achieving cheaper energy bills. Here, the team at Swan Windows explain the advantages of double glazing, how much you could save, the different frame types that are available and what the energy ratings mean.

Why is double glazing better than single?

It keeps more warm air in, so your property is better insulated – and that means fewer draughts and cheaper heating bills. It also keeps more noise out, and boosts security: double-glazed glass is more difficult to break than single.

How much cheaper will my bills be?

The Energy Saving Trust says that replacing all the windows in a three-bedroom, semi-detached house would save £75-£100 per year with B-rated glass and £85-£110 per year with A-rated glass. As double glazing should last for at least 20 years, that’s a total saving of between £1,500 and £2,200.

What is the WER system?

The WER (Window Energy Rating) system follows a similar pattern to appliance energy labels, with windows being rated from A+ (best) to G (worst). Building regulations require all new windows to be at least C-rated. The energy saving difference between an A, B or C-rated window isn’t huge.


The brighter the light, the greater the heat loss.
This thermal image shows how much more heat is escaping from the single-glazed house (left) in comparison with the double-glazed house (right).

What types of frames are there?

  • uPVC Available in a variety of colours and finishes, including wood, but white is the most popular. It’s easy to keep clean, too, requiring little more than a wipe down with a soft cloth and a spot of washing up liquid every now and again.
  • Aluminium There have been huge advancements over recent years in design, thermal performance, security and aesthetics.
  • Timber Many people feel that wooden windows look nicer and more subtle than uPVC, particularly in traditional or period-style houses. Timber windows tend to be a more expensive option.

Are there alternatives to double glazing?

If you are unable to install double glazing (if you live in a listed building, for example), then secondary glazing is a viable alternative, and involves fitting an additional layer of glass inside your existing windows.

For more information on anything you’ve read above, click the button below to get in touch with us. Or alternatively, have a look at our Windows page.

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If you decide to go ahead and approach us for a free, no obligation quote for double or secondary glazing, rest assured we offer the following:

  • The security of being FENSA registered.
  • Our Insurance Back Guarantee.

  • Decades of experience as a local, family-run business. Check out our reviews on monitored consumer sites, such as WHICH Trusted Trader and