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The Ultimate Guide for Windows with Double Glazing

Are you going crazy from the cacophony outside? Even though your heating costs are through the roof, is your home still freezing in the winter? Installing double-glazed windows could be the answer for you in that case!

The advantages of double-glazed windows are numerous and priceless. By improving the insulation of your home, double glazing, the correct windows can significantly improve comfort and functionality.

The ideal fit will ultimately depend on your demands, though. What are the best double-glazed windows for my home? is a question you may have, and by reading this review, you will discover all you need to know to get an answer.

Double-glazed windows are available in a variety of designs so that you may match them to your contemporary home. The frame can be made out of a variety of materials as well. Choose from windows made of wood, aluminium, or uPVC.

Our study indicates that the starting price for double-glazed windows, excluding installation fees, is around £300. Depending on the style, size, material, and colour of the frame, the real cost of the best double-glazed windows in the UK may vary significantly.

The best double-glazed windows should be found nearby, please! We help you find the most affordable double-glazed windows at GreenMatch. We accomplish this by saving you time and providing you up to 4 options from local providers that are specifically crafted to meet your needs. Then, you may compare rates in an objective manner and secure the finest offer. Simply choose your region below.

A double-glazed window: What Is It?

Double-glazed windows have two glass panes installed in frames with a 12 to 16 mm gap between them. The space between the two glass panes is maintained by a spacer bar. Regular air is typically used to fill this space, however other gases such as argon, xenon, or krypton may also be used.

Due to its capacity to trap air between glass panes and significantly reduce heat and sound transmission, this type of double glazing is also known as insulated glazing.

The glazing technique is not, however, restricted to using just two layers of glass. There are other windows on the market with triple glazing. Both double-glazed and triple-glazed windows produce excellent results, although the reduction in heat loss and noise is greater with more layers of glass in the window. In any case, if the heat is lost through a single-pane window, no matter how effective or complex your heating system is, you can’t get the most out of it.

Along with energy-saving incentives and other items on the market, double glazing is anticipated to continue growing in popularity. Double-glazed windows may enhance your home while also lowering your carbon footprint due to the large range of frame materials and glass options available. Discover more details regarding double glazing products’ costs in the UK.

How Do Windows With Two Glasses Operate?

The thickness of single-glazed windows is merely a few millimetres. They make it more difficult to maintain the ideal temperature in your home since heat can readily pass through them. Double-glazed windows, on the other hand, let in light while insulating your home.

A hotter body naturally transfers heat to a cooler one. Between the inner (hotter) and outer (cooler) panes of the window, the air between the panels serves as an insulating barrier. The heat from your house has a harder time escaping to the outside as a result.

It may be necessary to install trickle vents at the top of some double-glazed windows. These are made to let fresh air flow through a space and lessen condensation buildup between the glass panes. When utilised properly, trickle vents do not significantly enhance heat loss or reduce noise, according to our experts at GreenSavings Network.

Double-glazed window components

The glass panes, the primary seal, the secondary seal, the cavity, and the spacer bar make up the six main parts of a double-glazed window unit. Desiccant is frequently placed between the glass panes to absorb any moisture and prevent fog from collecting there. The windows can also be tinted, translucent, or coated with a reflective film. The coatings’ main function is to cut down on light entering the space or prevent the sun from heating it up.

Double-glazed window types and lifespan

Double glazing firms can provide any type of window or double-glazed door to suit your demands, depending on your individual requirements.

Your new double-glazed windows can be customised in terms of the glass type, window frame material and design, spacer bar type, and substance used to fill the space between the glass panes.

All contemporary windows have rating labels emphasising their level of energy efficiency that were produced by reliable British organisations. Although the labels list ratings from A to G, the lowest window you can install and still comply with UK building codes is one with a C rating.

Which double-glazed windows are the best? All varieties, then, provide various advantages. Please continue reading to learn more.

Many types of glass

In addition to being quite useful on their own, most glass kinds can be combined to meet certain requirements.

The best double glazing glass for various applications is as follows:

1. Low-E or energy-efficient windows

For frigid climates where a lot of energy is expended on heating a house, low-E, low-emissivity, or energy-saving glass is the ideal option. The most energy-efficient windows are likely those built of this type of glass. You can be confident that it will help you lower your heating costs.

2. Glass Acoustic

In order to reduce undesirable noise levels from the outside, acoustic glass has been developed. It is made of one or more acoustic interlayers and two or more glass sheets joined together. As the sound waves pass through the glass, these layers make them less powerful. It is regarded as the best double glazing when it comes to noise reduction.

3. Glass That Cleans Itself

uPVC window technology has advanced to the point that you can now get double-glazed windows that clean themselves. The transparent pre-coating on self-cleaning glass works to break down the grime and distribute water evenly throughout the surface.

4. Glasses, safety

Safety glass is less likely to shatter or injure someone if it does. Toughened glass and laminated glass are the most popular safety glass types for windows. The first one goes through a process to make it stronger. It breaks down into little, less harmful granular pieces when broken. Comparatively, laminated glass is made up of layers of both glass and plastic. The interlayer keeps the bits of broken glass together. Additionally, its shape provides better sound insulation than conventional glass.

5. Glass Fire

The greatest option for protection against fire or smoke is this type of glass. This glass is more impact-resistant thanks to methods for toughening, laminating, and coating, which also produce a barrier that prevents the passage of gas, flame, and smoke.

6. Glass Security

Even more defence against aggression or vandalism is provided by security glass than by safety glass for your home. These panes can withstand attacks with hammers, screwdrivers, bricks, and axes for 1-2 minutes and range in thickness from 7.9mm to 18mm.

7. Artistic Glass

Double glazing glass can be produced in a variety of ways to offer a variety of patterns, colours, textures, and opacities. The ideal material for giving your house the unique design touch you want is decorative glass. To increase functionality, it can be paired with some of the aforementioned categories.

8. Glass with solar control

The solar control glass has the unique ability to reflect and filter the sun’s rays, allowing natural light to enter the space without creating uncomfortable glares. It may be the best option for a structure with a lot of glazed surfaces.

Frame Material Types

Typically, the window frames for double-glazed windows are made of uPVC, aluminium, or wood (unplasticised polyvinyl chloride). The right structure must be chosen because it can reduce a window’s insulating capabilities by up to 30%.

1. uPVC Frames

When it comes to double-glazed windows, uPVC is the material that is most frequently employed. This is so because uPVC frames are frequently the most affordable choice. They still offer great insulation, though, and require very little upkeep. These frames also come in a wide range of hues and materials. The main drawback is that they may experience enlargement when exposed to strong sunshine.

2. Timber Frames 

The many hardwoods used to make timber frames. They are incredibly strong and give the house a traditional appearance. Instead of painting them, they are typically stained and varnished. They are more expensive than uPVC double-glazed window frames and require more upkeep, despite the fact that they are highly elegant.

3. Aluminum 

The least preferred frames are made of aluminium due of their expensive cost and poor insulating capabilities. Nevertheless, they offer a few key benefits, like being sturdy, secure, little maintenance, and anticipated to endure a very long time.

divider bars

The continuous hollow frame that divides the two glass panes in a double-glazed window is known as a spacer bar. The spacer bar, which is a crucial component of double-glazed windows, is normally constructed of aluminium or a material with low heat conductivity (warm-edge spacer).

Currently, aluminium spacer bars are the most popular due to their low cost, light weight, flexibility, and strength. However, the warm-edge spacers are more effective in providing insulation.

Along with different types of glass and materials, double glazing firms have developed a variety of forms and styles to accommodate any home and preference. The most well-liked are:

    • Replacement casement windows and casement windows
    • Sash windows with double glazing
    • swivel-and-tilt windows
    • Two-way windows
    • windows with full reversibility
    • Windows with bay and bows
    • Circular windows
    • quaint windows
    • Secondary glazing or secondary windows

How Durable Are Double-Glazed Windows?

Double-glazed windows have a lifespan of between 10 and 50 years, depending on how well they were built, fitted, and maintained. For instance, more care may be needed to maintain the best paints or varnish on wood double-glazed windows. Similar to that, after around ten years, poor quality seals may degrade and permit draughts.

The leading double glazing firms in the UK claim that, with proper maintenance, double-glazed windows should survive for at least 20 years on average. Additionally, many businesses offer lengthy guarantees of between 10 and 12 years.

This tutorial also includes advice on how to determine whether your windows need to be repaired or replaced.

How Much Do Double-Glazed Windows Cost in the UK?

Double-glazed windows come in a variety of price ranges depending on size, material, and style. Other elements, such as the number of windows, the type of glass, the colour of the frame, the floor where you want to place the window (for example, the ground level vs. the second floor), installation fees, and probable shipping expenses, may also have an impact on your final bill.

The more economical option for the frame material is uPVC. However, compared to the uPVC alternative, aluminium and hardwood frames are more expensive and less functional.

The most common window styles are casement and sash windows. In general, dual turn windows are the most expensive choice, while casement windows are the most affordable

Initial Double-Glazed Window Costs

Without installation fees, double-glazed windows start at around £300 in the UK. At GreenMatch, we calculate that the beginning price is between £500 and £600 per window, taking into account that having your windows installed by a professional may cost you an additional £200 to £250.

A double-glazed casement window would start at about £560, a sash window at £650, and a tilt-and-turn window at £760, all including installation fees. It’s also useful to know that sash windows made of uPVC are the most common in the UK.

For a price comparison of various window types and frame materials, see the tables below. Please keep in mind that these figures might not actually represent an offer. They are merely an estimate to give you a general idea of the price, installation included.

Double-Glazed Casement Windows Price
Frame material Average cost per window (100cm x 100cm)
uPVC £560
Wood £600
Aluminium £650
Cost of Double-Glazed Sash Windows
Frame material Average cost per window (100cm x 100cm)
uPVC £650
Wood £695
Aluminium £755
Cost of Double-Glazed Tilt & Turn Windows
Frame material Average cost per window (100cm x 100cm)
uPVC £760
Wood £815
Aluminium £885

You might be thinking at this stage if double-glazed windows are worthwhile. Quick response: Yes!

By upgrading to double glazing with an energy efficiency of A+, you could save up to £145 annually on your bill in addition to the many benefits they have for improving the comfort of your house. Furthermore, installing double-glazed windows can boost a home’s market value by up to 10%.

Do you want to know how much money double-glazed windows can save you? Simply click on the button below.

Repairs for double-glazed windows

Double-glazed windows shouldn’t require any maintenance or replacement for a long time. There are two warning indications, nevertheless, that suggest you might need to have your double-glazed windows repaired or replaced.

    1. If you observe a decline in your level of comfort. For instance, you will sense a draught coming through your windows if they are leaking. As a result of the quicker heat loss, energy costs will increase. Additionally, it can be a sign of leaking if there is increasing noise coming in from the outside.
    2. if you notice any physical harm to them. For instance, a damaged seal, condensation between the panes, a change in colour, or if they become more challenging to open could all indicate this.

You should get in touch with the installer or hunt for replacement windows if you’ve realised that your windows require fixing or if you’re considering buying new ones. If you need new double glazing, try GreenMatch’s estimate comparison service.

In any event, maintaining your double-glazed windows will help to increase their lifespan and keep them looking their best.

Benefits of double-glazed windows

1. Lower energy costs

Single-pane windows may let in between 50 and 70 percent less heat than double-pane windows. A double-glazed window can save your yearly energy costs by up to £145 because it is more difficult for heat to escape through one.

2. Safety at Home

Windows with double glazing are substantially more durable than those with single glazing. Even though double glazing is not impenetrable, certain glass kinds, such as safety and security glass, can make your double-glazed windows much more difficult for intruders to breach.

3. Calm House

Up to 60% of the noise from outside that enters a room can be reduced by double-glazed windows. This is crucial for people who live close to crowded urban regions.

4. Prevents Damage to Your Furniture

The heat might harm some furnishings if it receives too much sunshine. However, double-glazed windows reduce the amount of direct sunshine that enters your home, minimising the chance that your furniture, paintings, carpet, and other items may become harmed.

5. Boost Home Value

A home’s value is higher when double-glazed windows are present than when they are not. Therefore, if you decide to sell your home, installing double-glazed windows is a wise long-term investment.

6. Limit Your Carbon Footprint

Units with double glazing are more energy efficient. Additionally, they can greatly lower the amount of greenhouse gases produced by heating and cooling. As a result, you will lessen your impact on the environment.

What Drawbacks Do Double-Glazed Windows Possess?

1. Cons of Trapped Heat

While trapped heat may be an issue in the summer, double-glazed windows are particularly practical in the winter. This issue might be resolved by installing trickle vents or tinting your windows.

2. Not Repairable

Windows with double glazing cannot be repaired so easily. Condensation may develop between the glass panes if the window seal is not airtight. The windows cannot be pulled apart to correct the issue because they are already sealed. The entire unit must be fixed as a solution. Condensation can be avoided, but, for example, by installing trickle vents at the top of the windows.

3. Are Not Complementary to Older Homes

These windows might not look right if your home was constructed in an earlier architectural style. Even so, some double glazing firms create windows with double glazing just for this kind of house.

4. The Start-Up Price

They cost more than single-pane windows because they have two glass panes and, occasionally, unique parts. However, we at GreenMatch believe that it is worthwhile to spend money on double-glazed windows.

Queries Regarding Double-Glazed Windows

Which type of double glazing is the most efficient?

It depends on what you want to achieve with your double glazing. While versatile and powerful, each type of double glazing is designed to function most effectively for a specific purpose. E.g:

    • Low-E or energy efficient glass is most effective in colder regions. It is probably the most energy efficient glass of double glazing.
    • Acoustic glass is most effective for noise reduction purposes.
    • Safety glass provides the most effective protection against vandalism, theft or raiding on your home.
    • Decorative glass is best for personal home design
Which windows in the UK are the best?

The best window is the one that best suits your needs. You can choose a new double-glazed window based on the type of glass, the material and shape of the window frame, and the space filling between the panes (e.g. dry air, argon).

In this regard, double glazing companies can supply all types of windows according to your specific requirements. If you want to find out more, you can read GreenMatch’s report on the UK’s leading double glazing companies.

In terms of frame material, PVC windows are the cheapest. On the other hand, casement windows and sashes are the most popular styles. It is also good to know that uPVC sliding windows are the most common choice in the UK.

What is superior than windows with double glazing?

Triple-glazed windows are better than double-glazed windows when it comes to energy efficiency. They are the most energy-efficient glass options on the market.

These windows should make your home warmer and more soundproof than double-glazed windows. However, they are much more expensive.If you want to install these devices in your home, but the cost is prohibitive, you might consider installing triple glazing only in the coldest rooms or rooms that are most affected by outside noise.


Which windows have the highest energy efficiency?

Low-E glazing is probably the most energy efficient window.

In the UK, all modern windows carry a rating label issued by the UK governing body, highlighting their level of energy efficiency. While the label gives a rating from A (or even A++) to G, a C-rated window is the lowest rating you can install and still meet the country’s building codes.

Windows energy rating labels are issued by one of three organizations:

    • British Window Rating Council (BFRC);
    • British Standards Institution (BST);
    • and Thermal Ratings Register (TRR).
Will the government provide funding for double glazing?

The Green Homes Grant will close for new applications on March 31, 2021 at 5pm. The program had previously been extended until March 2022. However, in a new government press release, it announced that applications would close a year ago on March 31, 2021.

However, there are other alternative grants in the UK to encourage the transition to a greener lifestyle. 

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