Best Double Glazing Windows and Companies

Buying high quality double glazed windows will save you money on your energy bills, as well as making your home quieter, warmer and more secure.

There are lots of options when it comes to the style, frame and even the glass, meaning you can design bespoke double glazed windows for your home.

Most homeowners use well-known national companies to make and install their double glazed windows, but small local companies can also be a good option.



Best Double Glazing

best double glazed windows

Many homeowners install new double glazed windows to improve the energy efficiency of their property. Since 18% of a home's heat loss comes from its windows, switching to new double glazing can save you thousands on your energy bills in the long-term. There are other benefits too, including soundproofing your home and improving its security.

Double glazed windows aren't cheap, however; they'e a long-term investment, so it's important that you choose well-made windows that are the best fit for your home. After all, you don't want to spend thousands on windows to find they break after only a few years, or you go off the style and want to replace them again.


What's in This Guide to the Best Double Glazed Windows?

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Best Double Glazed Window Styles

best double glazing window styles

If you’re replacing existing windows (whether it’s single glazing or old double glazing), it’s best to install new windows which are at least a similar style to your current ones (if not the same). Your new windows will need to fit in the space left by your old ones, so it’s much easier to choose a style that won’t require any major building work needing to be done to your house! If you’re building a new home you can be more flexible in what style of window you choose, however, as you’ll be less constrained by things such as available space.

You should also consider the style of windows on other properties within your neighbourhood. If you live in a terraced house, for example, and choose to install new casement windows when all the other properties in your street have sash windows, your house may end up sticking out like a sore thumb. It's best to choose a style that blends in with the local aesthetic and in some areas, this may be a local authority requirement.

Read on to find out about the most popular styles of double glazed windows.


Casement

Casement windows are the most common style of double glazing in the UK. These windows are attached to their frame by one or more hinges at the side, and typically open outward using a handle. Casement windows are often held open in position using a metal bar with hooks, known as a casement stay.


Sash

Sash windows have one or more movable frames (or sashes) that open by sliding up and down via a sliding mechanism attached to the window frame. Sometimes sash windows open by sliding side to side, rather than up and down. These frames are popular on more traditional, period properties.


Tilt and Turn

Tilt and turn windows open in 2 different ways. The ‘tilt’ functionality of the window allows it to be tilted inwards (or outwards) at an angle to provide ventilation in a room. The ‘turn’ functionality of the window allows it to be swung inwards(or outwards) for a wider opening option, allowing more air to enter your home.


Dual Turn

Dual turn windows are often made up of 2 separate panes of glass that can be separately tilted outwards to provide ventilation for your home. These window panes can also rotate 360°to allow you to reach both sides of the glass from within your home; handy for cleaning.


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Best Double Glazed Window Frames

best double glazing window frame materials

Once you’ve decided what style of double glazed window you’d like for your home, the next step is to choose the window frame material. The frame around your windows can have a huge impact on the overall look of your home, so it’s an important decision to get right. For example, installing modern aluminium window frames on a Victorian house from the 1800s would look completely out of place, but the same frames would be suitable on a new-build home.

There are 3 main types of window frame material available in the UK: wooden, uPVC and aluminium. This table gives you a rundown of their key features:

Material
Natural Appearance
Lightweight
Low Cost
Weather Resistant
Low Maintenance
Energy Efficient
Aluminium
Wooden
uPVC


Aluminium

Aluminium is the most modern-looking type of window frame material, making it best suited to contemporary houses. It comes in the widest range of colours, allowing you to make your home truly unique. Like with uPVC, it is an extremely lightweight but durable material.

It is an expensive choice however, and provides the least insulation amount of insulation out of all the window frames (meaninf your home could feel a little chilly in the winter). Aluminium window frames are weather resistant, meaning they require very little maintenance to retain a fresh look. They are also incredibly strong, enabling you to improve your home's security.


Wooden

Wooden window frames are the most environmentally-friendly type of material, and are great for listed or period property because of their traditional look.

While wood is extremely strong, it can be vulnerable to adverse weather conditions. This means it's susceptible to rotting, splintering and warping. Wooden window frames are therefore the most high maintenance, needing regular repairs such as sanding and repainting. However, if looked after properly they can last up to 60 years, making their higher upfront cost a worthwhile investment.


uPVC

uPVC is the most popular type of material for double glazed window frames in the UK. The main selling point of uPVC is that it's very low maintenance, requiring a wipedown every now and then to keep it looking spick and span. uPVC is also weather resistant, meaning it doesn't get damaged from extreme weather like hail or snow.

uPVC is the cheapest frame material available on the market, costing around 3 times less than wooden window frames. It comes in many colours and finishes (including wood effect), although white is the most common option. Because it is a type of plastic, uPVC window frames are better suited to new-build or modern homes.


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Best Double Glazed Glass

The final decision you need to make is what type of glass you’d like for your double glazed windows. You have a number of options when it comes to glass, from clear and etched, to decorative and stained. The type of glass that’s best for your house will depend on a number of factors, including the style of your home and the location of the window. For example, if you have a traditional period house, you might want ornate etched glass windows that fit in with the overall look of your property. On the other hand, if you need a new window for your bathroom, you’ll probably want obscure glass so that your nosey neighbours can’t peak in while you’re taking a shower!

Bevelled

Bevelled glass involves creating a series of angled surface cuts into a pane of glass, to create simple patterns through to ornate designs. The bevels act as prisms when hit by sunlight, filling your home with a rainbow of colours. To really see the benefits of this type of glass, it’s best for windows that get plenty of sunshine.


Clear

Clear glass is the most common type of glass used on windows in the UK. As the name suggests, it allows you to see straight through your window without any distortions or obstructions. This type of glass maximizes the amount of light that can enter your property, so it’s a great choice if your home can feel a little dingy at times!


Etched

Using acidic or abrasive substances, artwork can be carved into your windows - including patterns, lettering and coats of arms. The etching process leaves some areas of your window clear, while other areas will be frosted, allowing for some privacy.


Leaded

Leaded glass uses thin strips of black lead to hold small pane of glass together (often clear, but sometimes stained), to make an intricate pattern or design. This type of glass is best suited to traditional, period properties.


Obscure

Obscure glass (sometimes known as frosted glass) refers to any glass that has a pattern embedded into its surface, such as leaves, lines or dimples. Obscure glass allows plenty of light through it, but its textured surface distorts the image from the outside, meaning people can’t see much through it. This makes it perfect for bathrooms, as it provides plenty of privacy.


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Best Double Glazing Companies

When you’re spending thousands on double glazed windows for your home, you’d expect them to be of a high quality and installed properly by a team of experienced fitters. This is why many homeowners use a well-known national company such as Safestyle UK or Anglian, as they know they’ll receive a high standard of service.

Based on our research and feedback from customers, the best double glazing companies in the UK are:

  • Anglian Home Improvements (Anglian)
  • Everest
  • Safestyle UK
  • Zenith

The table below compares the key features of the best double glazing national companies:

Company
Build Quality
Installation Quality
Value for Money
Customer Care
Trustpilot Score
Anglian
4/5
4/5
3/5
4/5
7.4/10*
Everest
4/5
4/5
3/5
4/5
8.1/10*
Safestyle UK
5/5
4/5
4/5
4/5
7.9/10*
Zenith
3/5
2/5
3/5
3/5
6.3/10*

*correct at time of writing on 10th August 2018


In May 2018, we carried out a survey of 361 homeowners who've used Anglian, Everest, Safestyle or Zenith to install their double glazed windows in the past 2 years. Here's what they had to say about these companies:

Company
% of Customers Who Felt Pressured to Sign a Contract
% of Customers Who Rated Their Installation as Good to Excellent
Anglian
40%
98%
Everest
45%
97%
Safestyle UK
40%
92%
Zenith
25%
95%


Anglian

Our Score:

Styles: Bay, Casement, Cottage, Sash, Shaped, Tilt and Turn

Frame Materials: Aluminium, Wooden, uPVC

Glass: Bevelled, Brilliant Cut, Clear, Decorative, Etched, Obscure, Stained

Energy Efficiency: A++ to A

Warranty: 10 Years


Established in 1966 as Anglian Windows, the company now trades under the name Anglian Home Improvements. Anglian is a market leader in home improvements, having helped over 1 million customers install double glazed windows.

All of Anglian’s double glazed windows are tailor-made to fit your home perfectly, and the company takes particular pride in the fact that its products are ‘Made in Britain’ from start to finish. Anglian offers a wide range of window styles in aluminium, wooden and uPVC frames.

Anglian scores well for the quality of its double glazed windows and installation service. However, the company has received some negative comments about its prices, with a few customers complaining about how expensive Anglian's products are compared to other window installers. Customer service and after-sales support has also been an issue for a handful of homeowners.


Everest

Our Score:

Styles: Casement, Dual Turn, Sash, Secondary, Tilt and Turn

Frame Materials: Aluminium, Wooden, uPVC

Glass: Clear, Flare, Jazz, Obscure

Energy Efficiency: A+

Warranty: 10 Years


Everest has been supplying and installing windows since 1965. Within this time, it has fitted double glazing in over 2 million homes in the UK.

All of its windows are manufactured in the UK at factories in Kent and Glamorgan. Everest's windows are produced in aluminium, wood and uPVC frames, and come in a range of different colours and finishes to suit every home. It also offers some of the most popular double glazing window styles including casement and sash.

Everest is well-known for the quality of its windows and installation, with its top-of-the-range Amdega collection of wooden double glazed windows proving a popular choice for homeowners. The majority of its customers have been happy with the customer service they received, although some have complained about the poor quality of the company’s complaints handling.


Safestyle UK

Our Score:

Styles: Arched, Bay, Casement, Sash, Tilt and Turn

Frame Materials: uPVC

Glass: Bevelled, Clear, Leaded, Obscure, Stained

Energy Efficiency: A

Warranty: 10 Years


Installing windows for over 20 years, Safestyle UK has expanded from a single store in Bradford to over 40 stores across England and Wales. It's the UK’s number one supplier and installer of uPVC products, having helped over 800,000 homeowners install new windows and doors.

Safestyle UK offers its customers a range of popular double glazed window styles, including casement and sash windows. Its new Eco Diamond range of A-rated glass is available in most of its window styles. All of Safestyle’s windows are manufactured at its specialist factory in the UK.

Safestyle UK performs well for the quality of its double glazed windows and installation service, with many customers being impressed with the knowledge of the company's salespeople and the skill of its fitters. Safestyle UK has also been commended on the fairness of their prices - the company operates a ‘Price Promise’ agreement in which it guarantees to charge less for its windows than any other competitor. Some customers have had issues with Safestyle UK's customer service, however.


Zenith

Our Score:

Styles: Bay, Bow, Casement, Sash, Tilt and Turn

Materials: uPVC

Glass: Clear, Decorative, Leaded

Energy Efficiency: A

Warranty: 10 Years


Founded in 1969, Zenith is one of the largest double glazing companies in the UK, installing over 50,000 windows each year.

The company specialises in uPVC products, manufacturing its entire range of windows in this type of frame material. For those who are more conscious about the environment, Zenith has introduced its EcoTherm range of A-rated energy efficient windows, made from a recycled uPVC plastic.

While the quality of Zenith's windows is fair, some customers have raised issues with the installation process. There have been complaints about the poor quality of fitting, with windows being the wrong size or shape and fitters leaving a mess. Customers have also had problems with long delays waiting for installation, along with slow response times for fixing faulty or damaged windows.


Local Double Glazing Companies

While some people choose a well-known national company to fit their double glazed windows, some ‘shop local’ and use local double glazing installers. The advantage of this is that the quality of your installation is likely to be good, since small local firms have to rely more on word of mouth to keep their business going. After all, just 1 unhappy customer could harm business.

Another benefit of choosing a local installer is that you can ask to view examples of their work within your local area. This can ensure that you’re satisfied with the standard of their windows and quality of their installation before you commit to buying. Local companies may also offer low prices for their windows, since they won’t have large overhead costs to cover.

Bear in mind, however, that local installers might have a much more limited range of double glazed window styles, frame materials and glass to choose from compared to national installers. Since their team is likely to be small, you might also find that the wait between purchase and installation is longer than with a nationwide company.

When looking for a local installer, make sure that you use one that is FENSA registered. FENSA is run by the Glass and Glazing Federation (GGF) to ensure that double glazing installers comply with the UK government’s building regulations. This protects you from cowboy builders and ensures you’ll receive a high level of service from your installer.

Based on a survey we ran in May 2018 of 414 UK homeowners who used local double glazing companies to install their double glazed windows in the past 2 years, 1 in 3 did so because of recommendations from friends and/or family. Here is what else the homeowners we surveyed said about local installers:

% of Customers Who Felt Pressured to Sign a Contract
% of Customers Who Rated Their Installation as Good to Excellent
16%
92%


If you want to find out more about any of these double glazing companies, visit our short guide on double glazing installers.


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What Is the Most Energy Efficient and Safe Double Glazing?

best double glazing installers

Once you’ve decided on the style, frame material, and glass of your double glazed windows, and have chosen which company to install them for you, you must make sure that they're both energy efficient and safe.

A high-quality double glazed window can significantly reduce heat loss from your home while improving its security. But to enjoy these benefits to the max, you'll want to opt for top-of-the-range double glazed windows.

New windows are given an energy efficiency rating by the National Fenestration Rating Council (NFRC). This ranges from A++ (very efficient) to G (inefficient) using a ‘rainbow’ rating label, similar to those found on electrical appliances around your home. Always try to choose windows with an energy efficiency rating of B and above, as these will save you the most on your energy bills.

The Energy Saving Trust also runs its own rating system in which it endorses windows with high energy efficiency.

You should also ensure your new double glazed windows meet or exceed the British Security Standard. Secured by Design (SBD), an official police security initiative, endorse windows which have achieved certain standards of security, including burglary resistance.

The table below shows you the number of windows endorsed by the Energy Saving Trust and the SBD initiative from the best national double glazing installers:

Double Glazing Installer
Number of Windows Endorsed by The Energy Saving Trust
Number of Windows Endorsed by SBD
Anglian
14
4
Everest
5
0
Zenith
2
2
Safestyle UK
2
0


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