Double Glazing

Manufactured in our Bristol & South West family-owned factory

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Double Glazing

  • Double glazing is especially designed to put a halt to excessive heat loss, helping you save money on your household bills. It also is a great way to reduce outside noise, which is ideal if you live near a busy road or are just looking for some peace and quiet.

    Double glazing works by having two separate panes of glass in one window frame with a gap between them. We fill this gap with a gas called argon, which is denser than air – this works as an insulator, and the cold temperature of the outside window pane is not transferred to the inner pane. This also significantly reduces condensation on the inside of your windows, an issue often seen with single glazing.

    All our double glazed windows come with excellent energy saving ratings, and we also offer Super Energy Efficient glazing and triple glazing to help shrink your energy bills even further. Installing double glazing in your home is a great investment, saving you money on heating and also adding value to your home.

    Double glazing also adds an extra level of security to your home, as the thicker frames and double glass panels are harder to break. We use high security hinges and thermally toughened glass to make sure you feel safe in your home.

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    Lifetime Guarantee
    10-year manufacturer’s guarantee.

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    Tailor Made
    Classic windows tailor made to your exact specifications.

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    Secured by Design
    Covered by the Official Police Security Initiative.

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    100% Satisfaction
    Award-winning customer service and after-care support.

  • Our industry-leading A+ rated double glazing provides ultimate safety and security, reduced noise pollution and high levels of thermal efficiency – saving you money on energy bills.

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    Flexible monthly payments

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    Interest free credit

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    Buy now / pay later

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    No finance required

If you’re thinking about replacing your windows with double glazing, we’re here to help! Contact us today for a free, no obligation quote, or visit your local showroom to talk to one of our experts.

Call us on: 01275 878153

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Is it worth replacing double glazing?

Double glazing tends to have a lifespan of around 20-30 years, and as they get older they tend to become less efficient. If you’ve noticed that your windows don’t seem to be insulating your home as well as they once did, it might be worth replacing them. The gas between the two panes (at Britannia we use argon) can escape slowly over time, diminishing the windows’ sound and heat insulation properties.

By replacing your old windows with high-quality, professionally installed double glazing, then your new windows will be draught-proof and much more insulative. Our glass is always A-rated, which will help retain more heat inside your home, and save you money on your heating bill!

What is the best gap for double glazing?

Double glazing insulates against noise and heat because of the gap it has between the panes of glass. At Britannia we fill the gap with argon, a dense gas that stops cold air or noise travelling through the glass.

We’ve found that a 28mm thick unit with a 20mm gap between the two layers of glass is the best option for double glazing, and we offer this as standard. Giving you the most energy efficient option will help you save on your heating bills and help protect the environment, two things we care passionately about.

Does double glazing reduce condensation?

Yes! Condensation is caused when the warm inside air hits the cold windowpane, causing the humidity in the air to condense and form droplets on the window. Double glazing is made from two panes of glass separated by a dense gas – we use argon. This gas stops heat transfer between the two panes of glass, so while the outside window pane might be freezing, the inner one should be at the ambient temperature of your home.

In some cases you may see a build up of condensation on the outside of the glass because the cold can not transfer to the inner pane. This effect is perfectly normal and will clear once the temperature rises outside your home.

Without the heat contrast between the inside air and the cold window, you can wake up after a cold night and open your curtains to find your windows condensation-free! In some rooms you may still get a small build up of condensation but this will be due to a lack of heat in the room or poor ventilation.

Does double glazing reduce noise?

Yes! Sound travels in waves, and can move fairly easily through single glazing. However, our double glazing consists of two panes of glass separated by a gap filled with argon gas.

Argon gas is denser than normal air, and has different soundwave properties as well. This makes it harder for sound to travel through. If you live next to a busy road or you are looking for increased peace and quiet in your home, we offer laminated Stadip Silence windows, which give you excellent levels of sound insulation without the need for thick, heavy glass. Contact us today if you think this would be a good option for your home.

What is double glazing?

Double glazing is different to classic single glazing because it has two panes of glass, rather than one. These two panes of glass are set in a window frame with a gap between them, and in this gap we remove atmospheric air and add argon gas instead. Argos gas is denser than air, and so it is much harder for heat to transfer between the two panes, resulting in thermal insulation.

Double glazing can make a significant difference to the efficiency of your home, and you’ll find that you’ll have to pay less for heating over the winter with quality double glazing windows.

How long does double glazing last?

The standard lifespan of double glazing depends on many factors, but if you look after your windows properly, they literally last a lifetime. If you want to make sure your windows last as long as possible you’ll want to check that the window quality is A-rated for energy efficiency, that the installation is carried out by experts and you have a high quality window frame to reduce draughts.

You can tell if your double glazing isn’t working to its full potential if you find you have to heat your home more during the winter, or if the inner pane of your window feels significantly cold to the touch.

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Features and benefits

Guarantees you can depend on.

We have built up a great reputation over years of delivering a first class service and excellent products, all from our local, no nonsense all-about-you company.

From characteristic country cottages to contemporary town houses, we’re confident that our products will offer a style and finish to truly transform your home. Through constant innovation the quality, durability and security of our products is genuinely second to none. As a local company we are proud to offer British Standards BS7412/PAS24 for enhanced security.

We refuse to compromise on quality

Our windows are made from British Made, high quality MarinespecTM components, with up to 25 years anti corrosion. They are built specifically for the more exposed areas of corrosion, such as coastal environments to give you worry free performance beyond your guarantee.  We believe spending more on components is worth every penny, and sets us apart from our competitors.

State of the art fabrication for best quality

We have invested millions of pounds into one of the most state of the art manufacturing facilities in the UK.  This enables us to provide you with consistently high quality products at exceptionally good prices. Our loyal factory workers are well trained and take pride in their work, they really care about quality.  Our machines are maintained according to a rigorous servicing regime to keep them in top condition.

Superior energy efficiency

Our ‘A’ rated energy efficient and triple glazed windows are tested by the BFRC, which will save you money on your heating bills. By law your windows and doors have to meet strict thermal performance regulations but you can be rest assured that our products exceed current requirements.

Energy saving is incredibly important and so is keeping your fuel bills down. We are continuously looking for ways to make our homes energy efficient and one way is to choose new PVCu windows and doors. Not only will they help to keep your home warmer, they will reduce your energy loss.

Don’t just take our word for it!

Our suppliers conform to strictly controlled and independently monitored Quality Management Systems such as ISO 9001, to ensure that everything is done correctly and according to best practise.

Our windows are tested independently by British Standards for security, weather tightness and strength performance. This means that periodically, we have to send them to independent test houses, in order to be tested to destruction.

These are just some of the many standards the products in our vast range conform to. Needless to say we take the quality of our products very seriously indeed.


Made to measure

The styles available are endless and the choices to suit your home are bigger than ever before. Traditional, contemporary or modern; our versatile window and door designs will create the look you want to complement and enhance your home. If you want windows that are as individual as you, our range of coloured and woodgrain windows offer you fifteen different colours and finishes.

A local business that really cares about its customers

Our sales consultants, surveyors, admin team and installers really care about you and your home. They are highly trained, motivated and want to go the extra mile to do the best possible job. Our fitters will treat your home with care and respect and will take time to ensure that you are delighted with the end result.

With a local showroom including an extensive display and experts on hand you can see before you buy and meet the team!

An effortless purchase process

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