Best Double Glazed Windows and Companies

Double glazing will lower your energy bills, make your home warmer and quieter, provide added security, and will add value to your property.

To compare prices from the best local and national installers operating in your area fill out the form at the top of this page.


In this Guide:

Which Double Glazed Windows are Best?

What is the Best Style of Double Glazing?

What is the Best Double Glazed Window Material?

Best National Double Glazing Installers

How To Find the Best Local Installers

What is the Most Energy Efficient and Safe Double Glazing?



Which Double Glazed Windows are Best?

best double glazed windows

Many homeowners install new double glazed windows in order to improve the energy efficiency of their house. 18% of heat loss comes from windows alone, and simply switching to new double glazing can save you thousands on your energy bills in the long-term.

Double glazing can also decrease the amount of noise entering your house from outside, reduce condensation build-up on the inside of your windows and improve the security of your property.

Double glazed windows are a large investment however, so it is important that you carefully research which which windows are best for you and your home. This guide helps you to make that decision by comparing:

1. Double glazed window styles

2. Double glazed window materials

3. Double glazing companies

4. Double glazed window energy efficiency and security



What is the Best Style of Double Glazing?

best double glazing window styles

There are many styles of double glazed windows to choose from. The style that is best for your home will depend on the look of your property.

If you are replacing existing windows, it is best to install new windows which are the same or a similar style to your current ones. You should also choose a style that is the same or similar to that of your neighbours in order to fit in with the local aesthetic. This is particularly important if you live in a terraced or semi-detached house.

Some common double glazing window styles include sash windows and tilt and turn windows. Casement style double glazing windows are the most popular, and are the type that will usually be quoted as standard if you do not express interest in a different style.


Casement

Casement windows are attached to their frame by one or more hinges at the side, and typically open outward using a handle. They can come in pairs or on their own within a single frame. 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 panes of glass (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.


Tilt and Turn

Tilt and turn windows open in two different ways. The ‘tilt’ functionality of the window allows the window to be tilted inwards (or outwards) at an angle to provide ventilation for the rooms in which they are fitted. The ‘turn’ functionality of the window allows the window to be swung inwards (or outwards) for a wider opening option.


Dual Turn

Dual turn windows are often made up of two separate panes of glass that can be tilted outwards to provide ventilation for the room in which they are fitted. They can also fully rotate to allow you to reach both sides of the glass from within your home.


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What is the Best Double Glazed Window Material?

best double glazing window frame materials

Once you have decided on the window style, the next step is to choose what window frame material you would like. Selecting the right material can completely transform the look of your home, so it is an important decision to make.

There are three main types of window frame material available in the UK: wooden, uPVC and aluminium. The table below compares these materials to help you to decide which type of window frame is best for your house:

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. Aluminium window frames are weather resistant, meaning they require very little maintenance work to retain a fresh look. They are also incredibly strong, enabling you to improve the security of your home.


Wooden

Wooden window frames are the most environmentally-friendly type of frame and are great if you have a listed or period property because of their traditional look.

Whilst wood is extremely strong, it can be vulnerable to changing weather conditions. This means it is susceptible to rotting, splintering and warping. Wooden window frames are therefore the most high maintenance, needing regular repair work such as sanding and re-painting. If looked after properly however, they can last a very long time.


uPVC

uPVC is the most popular type of material for double glazed window frames. The main selling point of uPVC is that it is very low maintenance, requiring only a wash every now and then to keep it looking clean and new. uPVC is also weather resistant, meaning that it does not get damaged from extreme weather such as hail or snow.

uPVC is the cheapest frame material, costing approximately three times less than wooden window frames. It comes in many colours and finishes (including a wood effect), although white is the most common option. Because of its artificial appearance however, uPVC window frames are best if you have a new-build or modern home.


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Who are the Best National Double Glazing Installers?

When installing double glazed windows, most homeowners choose to use a well-known national installer such as Safestyle or Anglian. Choosing one of these installers will allow you to feel confident that you'll receive high quality windows which will be installed by a team of skilled and experienced fitters.

The table below compares the key features of the best double glazing installers in the UK, based on our research and feedback from customers:

Brand
Build Quality
Installation Quality
Value for Money
Customer Care
Trustpilot Score
Which? Brand Score
Anglian
4/5
4/5
3/5
4/5
7.4/10*
63%*
Everest
4/5
4/5
3/5
4/5
8.2/10*
57%*
Safestyle
5/5
4/5
4/5
4/5
8.7/10*
56%*
Zenith
3/5
2/5
3/5
2/5
5.6/10*
n/a

*correct at time of writing on 27th November 2017


Anglian

Overall Rating:

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

Materials: Aluminium, Wooden, uPVC

Energy Efficiency: A+ to B

Warranty: 10 Years


Established in 1966 as Anglian Windows, the company now trades under the name Anglian Home Improvements. Anglian are a market leader in home improvements, having helped over one 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 their products are ‘Made in Britain’ from start to finish. Anglian offer a wide range of window styles in aluminium, wooden and uPVC designs.

Anglian score well for the quality of their double glazed windows and installation service. However they have received some negative comments about the price of their windows, with some customers complaining that their products are expensive compared to other window installers. Customer service and after sales support has also been an issue for some homeowners.


Everest

Overall Rating:

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

Materials: Aluminium, Wooden, uPVC

Energy Efficiency: A++ to B

Warranty: 10 Years


Everest have been supplying and installing windows since 1965. Within this time, they have fitted double glazing in over two million homes in the UK.

All of their windows are sourced and manufactured in the UK at their factories in Kent and Glamorgan. Everest windows are produced in aluminium, wood and uPVC and come in a range of different colours and finishes to suit every home. They offer some of the most popular double glazing window styles including casement and dual turn.

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


Safestyle

Overall Rating:

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

Materials: uPVC

Energy Efficiency: A

Warranty: 10 Years


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

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

Safestyle perform well for the quality of their double glazed windows and installation service, with many customers being impressed with the knowledge of their salesmen and the efficiency of their fitters. Safestyle have also been commended on the fairness of their prices - the company operates a ‘Price Promise’ agreement in which they guarantee to charge less for their products than any other competitor. Some customers have had issues with Safestyle’s customer service, however.


Zenith

Overall Rating:

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

Materials: uPVC

Energy Efficiency: A

Warranty: 10 Years


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

They are specialist in uPVC products, manufacturing their wide range of windows only in this type of plastic. For those who are more conscious about the environment, Zenith have introduced their EcoTherm range of A-rated energy efficient windows, made from a recycled uPVC material.

Whilst the quality of their windows is moderate, 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 and slow response times for fixing faulty or damaged windows.


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How do you Find the Best Local Installers?

Whilst most people choose a well-known national installer to fit their double glazed windows, some ‘shop local’ and use a smaller installer from their local neighbourhood. The advantage of this is that the quality of their installation is likely to be higher than that of national companies, since small local firms have to rely more on word of mouth to keep their business going. One unhappy customer could be harmful to business.

Another benefit of choosing a local installer is that you can more easily ask to see examples of their work in your local area before you buy. This will ensure that you are satisfied with the standard of their installation. Their prices are also likely to be lower than national double glazing companies, since they won’t have large overheads.

Bear in mind however, that because local installers are often only small companies, they might have a much more limited range of double glazed window styles and materials 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 installer.

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 will receive a high level of service from your installer.


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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 and material of your double glazed windows and have chosen which company to install them for you, you must make sure that they are both energy efficient and safe.

A high quality double glazed window can significantly reduce heat loss from your home whilst improving its security. It is therefore essential that you install top of the range double glazed windows to enjoy these benefits.

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 run their own rating system in which they endorse 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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