Double Glazing

Devon, Exeter and the surrounding areas

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Double Glazing

  • Double glazing contains the technology to stop excessive heat loss in its tracks so you won’t waste money on your energy bills. It is also an effective option for blocking out more noise from the outside. Get a quieter, warmer project with our state of the art double glazing options.

    Two separate panes in a single window frame make up the double glazing structure. Between the two panes is a gap which we fill with insulating argon gas, which blocks the cold air of the outside from transferring to the inner pane. In addition to the insulation, double glazing lessens condensation from forming on the interior windows which is a regular issue with single glazing. 

    Our double glazed windows are classified excellent in energy-saving ratings, and we offer Super Energy Efficient glazing for those who are extra energy-conscious. Additionally, we offer triple glazing to customers who want to see big reductions in their energy bills. The investment in double glazing installation will effectively change your every day, by giving you a warmer project with increased value and less hefty heating bills.

    With an extra pane involved, double glazing brings with it added security for your project. The frames we use are thicker too, so are difficult to break. Our windows are fitted with high-security hinges and thermally toughened glass so you and your family feel safe in your project.

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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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    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 double glazing is something that appeals to you and you would like to replace your windows with it, we are here for you. Contact us today and receive a free, no-obligation quote. You are also welcome to visit us in person at our Exeter showroom where an expert will talk you through your options.

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Is it worth replacing double glazing?

Giving you a very reasonable lifespan of 20-30 years, double glazing will decrease in efficiency as the years pass. If you feel yours aren’t performing their insulative purpose, it may be time for you to replace them. Gas inserted between the two window panes does slowly release over time, causing the sound reduction and heat insulation to dissolve.

Expect significant improvements in blocking draughts and providing insulation when your old windows are replaced with our high-quality double glazing. Assuring you A-rated glass and professional installation, you will find keeping your project warm requires less heating.

Does double glazing reduce condensation?

Yes, our double glazing includes argon gas in between the two glass panes to prevent heat transfer between the inside and outside. Condensation occurs when your project’s warm moist air hits a cold windowpane and forms droplets. The gas makes sure the inside pane remains warm so you will see less condensation.

Condensation may, from time to time, appear on the outside of the glass as the cold air could not pass through to the inner pane. This is a natural, normal occurrence and will disappear as the day warms up.

Gone are the mornings you open your curtains to find your window covered in wet droplets. Double glazing will give you that clear view no matter the temperature contrast. Some rooms which have lower heat or poor ventilation may bring small amounts of condensation but the windows are not the problem here.

What is double glazing?

Traditionally, windows were single glazed meaning that there was only one window pane. In double glazing, the windowpane is doubled to two within one frame. A gap between the two glass panes contains argon gas rather than atmospheric air, as argon is denser than air and thus makes it very hard for heat to transfer between the two panes. 

Double glazing is ideal for the energy efficiency of your project, leading you to cheaper heating bills in the colder months.

What is the best gap for double glazing?

We choose argon as our gas filler at Britannia, as its density stops cold air and noise from transferring very well. The gap is the reason noise and air struggle to get through.

From our extensive experience of manufacturing double-glazed windows, we have found a 28mm thick unit with a 20mm gap is the best setup. This is our standard, ensuring all our customers will get the most energy-efficient windows possible. Not only will your heating bills decrease, but you will also be doing your bit to protect the precious environment around us.

Does double glazing reduce noise?

As we know, sound travels in waves making it easy to move around. Single glazing lets in sound effortlessly, but double glazing does not. This is because double glazing contains two glass panes and a substantial argon-filled gap between.

Argon gas has a density which sound finds a lot harder to move through in comparison to the air we breathe. For projects which are situated next to busy roads or customers who appreciate peace, Britannia can offer you laminated Stadip Silence windows. These windows give especially excellent sound insulation without having to install thick glass into your project. Contact us today if you would like to discuss any of these options for your project.

How long does double glazing last?

Lifespans of our double glazing are heavily dependent on how they are treated and maintained. In situations where they receive top-quality care, they can last a lifetime. However, to ensure your windows are long-lasting, you should check the window quality for A-rated energy efficiency. Also, make sure the installation is done professionally and that the window frame is of high quality to prevent draughts. 

If you find yourself constantly having to turn up the heating in the winter, this is a telltale sign your double glazing isn’t performing. Another sign is if you touch the inner window pane and it feels very cold.

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 project. 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 projects energy efficient and one way is to choose new PVCu windows and doors. Not only will they help to keep your project 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 project 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 project. 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 project. They are highly trained, motivated and want to go the extra mile to do the best possible job. Our fitters will treat your project 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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