Double Glazed Windows

Double Glazed Windows

If you’re just looking for a costing, then head over to our online estimate tool to get a price. If you’re looking for more information about double glazing then read on! This article aims to provide general information about the double glazing windows that we can produce, supply and install for you.

Our Window Range

Double Glazed Sash Windows

Sash windows are the traditional style of window that you see in historic cities like London. There are two ‘sashes’ that move up and down, which are counter-balanced by lead weights. These are available in a huge range of styles and if your style isn’t part of our range, we can always speak with our factory and see if they’ll be able to manufacture a bespoke product for you.

We understand that many customers will have their hearts set on a particular product for their home, or are subject to council regulations that require specific replacements. That’s why we also offer our bespoke service, and can provide technical drawings on request should you require them.

Double Glazed Casement Windows

Casement windows are essentially any window that operates on hinges. These windows have been around even longer than Sash Windows, and can come in huge variety of styles and can also be manufactured on a bespoke basis. Casement windows form a perfect seal around the window aperture, so they’re definitely a window for those people who are practically minded and want to reduce their energy bills rather than focusing on aesthetics.

Price of Double Glazed Windows

The price of your new double-glazed windows depends greatly on the size and style of the window in question. If you’re looking for a complex style and a larger window, then it’s likely to be more expensive. In general, though, a new sash window should cost between £1.2k at the low end of the spectrum and £1.7k at the higher end for a sash window, and between £900 at the low end and £1.5k at the higher end for a casement window.

There are various ways that you can save money when buying new windows:

  • Casement windows cost less than sash windows, so you’d be able to save by getting your whole house fitted with casements.
  • Sash windows are cheaper if they’re on springs, so if your heart is set on sash windows then we could supply them all with springs and you’ll be able to save money that way.
  • Different glass types will raise the cost, i.e if you need extra security glass, acoustic glass or satin glass.
  • UPVC windows are the cheapest of all, but have innate drawbacks in that they don’t look very good in your home and they don’t last for too long. UPVC products are also very difficult to dispose of and harmful to the environment during manufacture, so save the planet and consider a timber alternative! Although UPVC is definitely on the low end of the price range, the long terms benefits on low end products are questionable.
  • Double-glazed windows are not necessarily any cheaper than single glazing, since they’re far more commonly requested and manufactured.
  • You can save money by asking for softwood products. Hardwood doesn’t necessarily last longer than softwood but has a higher price tag (softwood is on the low end of the price range, roughly 30% cheaper than hardwood on average).
  • If we can save the box frames and just change the sliding sashes themselves, that could save you around 20%. These depends on the condition of your boxes, as it can occasionally cost more to attempt to save an extremely broken box frame.
  • If you want us to save the old ironmongery and use that instead of supply new ironmongery.

Window Style Options

Your new windows are all produced as bespoke products, so there’s a great deal of variation in what we can manufacture. We would love to help you get the style of double glazed window that you love, so if you do have a very specific requirement, just let us know and we’ll be able to provide you some technical drawings to ensure that you’re happy with the double glazing window we’re making for you. Going forwards after the purchase, we can supply 10 year guarantees for all our new windows. This will save you having to look at repairs or new products for another 10 year period.

Sash Windows

We understand that many people have different sash windows in their home and this causes a huge variety of demand in style. Many people are attached to the traditional style of their home and when changing their windows or doors they generally want to save their home’s old-school look rather than go modern. We can help you to be confident that we understand your design by supplying technical documents if required. These products all come under our 10 year guarantee.

Casement Windows

As with sash windows, there’s a huge variety in demand for different types of these windows. As the most energy efficient windows, casement windows are a very popular choice in many different areas, so we get asked to replicate a particular style very often. If there’s any further information we can supply then please drop us a line and let us know so we can help out. As with sash windows, these products all come under our 10 year guarantee.

Timber Vs UPVC Windows

Plastic or UPVC windows are extremely bad for the environment and should be avoided wherever possible. They release harmful chemicals into the atmosphere during manufacture and are very difficult to get rid of, with many UPVC windows that were manufactured in the 80’s still filling landfills across the country to this day. Big, thick, bulky UPVC window can be very difficult to dispose of when compared with timber. Save the planet and the environment, and consider purchasing a timber product should you be interested in windows or doors.


As with all our windows, it’s important that you carry out proper aftercare after our installation team has left your home. If any issue arising post installation is covered under our guarantee, we’d be happy to return and help, but there are certain issues that won’t come under the guarantee. These include, but are not necessarily limited to, the following types of damage:

  • Excessive condensation in the home. Most rooms with new windows will have very low levels of condensation, but if your window is situated in the living room or bathroom then those levels of condensation are likely to be much higher. To minimise condensation, try to ensure that your clothes are dried in a dryer or airing cupboard as opposed to in front of the windows in your home. Don’t use drying racks in front of the product, as this will release large amounts of condensation into the home that can damage the timber-work over time.
  • Damage arising from improper use. We outline the proper way to operate the windows in our aftercare document. If you use the windows in an incorrect way or are negligent with them, we cannot return to help you out with a quick fix. Please ensure that you always use the windows in line with what our documentation or surveyors advise. This will save you the hassle of damaging your product and having to hire another trade (which is an additional price tag for you). Save your money, and operate the product safely and properly. If you need further guidance on this feel free to just drop us a line!


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Enjoy being warm and comfortable!

call us: 020 3302 2060 or email: [email protected]

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