Double Glazing

Hayle and the South West

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Double Glazing

  • Double glazing helps turn your home into a cosy haven. It helps prevent heat loss and stops draughts coming in, as well as reducing the amount of noise you hear from the outside, ideal for those who live in busy areas.

    Double-glazed windows are made by using two panes of glass in the same window frame. These panes have a gap between them that’s filled with a dense gas called argon. This means that when cold air hits the outside pane, very little cold is transferred to the inner windowpane. Unlike single glazed windows, you also get a lot less condensation on the inside of your frame. 

    All double-glazed windows made by us at St. Ives Windows have high energy saving ratings. However, if you’d like even better levels of energy efficiency, we can also offer you Super Energy Efficient glazing, or even triple glazing, which is made in the same way as double glazing, but with an additional pane of glass for extra insulation.

    Installing double glazing also has security benefits. It’s very difficult to break double glazing, and when we manufacture our windows, we use thermally toughened glass for doors and ground-floor windows. We also use strong hinges and locks for your peace of mind.

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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

Thinking of upgrading to double glazing or replacing old windows? Simply get in touch with St. Ives Windows. We’d be happy to arrange a no-obligation home visit, or you can visit our showroom to find out more.

Call us on: 01736 798964

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Is it worth replacing double glazing?

Double glazing tends to have a lifespan of around 20-30 years, and as your windows 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.

If your windows are less than 10 years old, and you’ve noticed they aren’t working as efficiently as you like, then you may be able to choose the more cost-effective option of getting them repaired. At St. Ives Windows, we offer a 10-year guarantee on our windows, so if they aren’t working to the highest standard, we can repair them for you.

Can double glazing reduce condensation?

If you’re fed up of finding condensation on your window panes, then you might want to opt for double glazing. Condensation is caused when warm air hits a cold windowpane, which turns the humidity in the air into water droplets. 

Double glazing slows the transfer of cold air outside from hitting the inner windowpane. It’s made up of two panes of glass, separated by a small gap filled with a dense gas called argon. This means your inner windowpane stays around the same temperature as your home, even if it’s freezing outside, meaning condensation is kept to a minimum.

What is double glazing?

Double glazing is made up of two panes of glass with a gap in the middle. These two panes are set inside the same frame, and argon gas is trapped inside. Argon gas is dense, so it acts as a kind of barrier, so when cold air hits the outer pane, the cold doesn’t transfer to the inside. The same goes for soundwaves, they are quietened before they reach your home.

Double glazing can have a big effect on the energy efficiency rating of your property, so if you invest in new windows, you can pay less for heating.

What is the best gap for double glazing?

The reason why double glazing provides insulation and dampens exterior noise is because of the gap between the two panes of glass. Inside this gap is argon, a gas that’s denser than air, slowing soundwaves and cold air from moving through to the inside. 

We’ve perfected our double-glazing manufacturing techniques over the years and found that units that are 28mm thick, with a 20mm gap, works best. This is what we offer as standard with all our windows, whether you opt for sash windows, casement windows, or any other style.

Does double glazing reduce noise?

Installing double glazing is an excellent way to reduce noise. If you have single glazing, soundwaves travel easily through the glass. However, double glazing is made up of two panes of glass, with the gap filled with argon gas, dampening the noise from outside.

The reason why double glazing is so effective is because of the gas inside the panes. Argon is denser than air, so soundwaves can’t pass through it as well. This means, when you shut your windows, exterior noise is reduced significantly. If you live near a busy road or in an area of Cornwall that gets noisy during tourist season, why not consider our Stadip Silence laminate as well? It keeps noise to an absolute minimum so your home is a calm haven.

How long will my double glazing last?

There are a number of factors that determine how long your double glazing will last. In general, you can expect your double-glazed windows to last for about 20-30 years with minimal maintenance. You should make sure you choose windows that are A-rated, to provide the best energy efficiency, and have them installed by experts such as our team at St. Ives Windows, to prevent draughts and ensure the best finish.

It’s usually easy to tell when double glazing isn’t working as well as it should. You may notice your inner windowpane feeling noticeably cold to the touch, or that excessive condensation forms inside. 

Do I need to replace my double glazing?

Double glazing will usually last 20-30 years. But as windows get older, you may find they are less efficient than when they were first installed. If they aren’t working as well as they used to, then it may be time to think about replacements.

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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 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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