The 5 Best Double Glazing Companies in the UK

Need new windows for your home but now sure who to buy them from? We’ve got you covered. Here’s our no-nonsense review of the best double glazing companies in the UK.

Do your windows let the cold in? Are you paying way too much for your heating bills? Maybe the sound of a busy road outside your house is driving you nuts? Or are you just a bit concerned about the security of your home? Installing new double glazed windows can help keep you warm and your bills low.

There are thousands of double glazing companies in the UK that supply and install windows, which can make finding the right one for you a challenge. Who offers the best quality windows? Who can you trust to do a good job? And where will you get the best value for money?

To help you, our window experts have tracked down the best double glazing companies (for window quality, price and customer service), based on independent research from Which?, thousands of verified user reviews on Trustpilot, and our own surveys of real customers up and down the UK.

Read on for our full review of the leading double glazing installers (and how they compare to local independent traders). Or save time by completing the form at the top of this page, and get bespoke double glazing quotes for your home from the most trusted window installers near you.

In our Guide to the Best Double Glazing Companies:



Best Double Glazing Companies in the UK

The 5 best double glazing companies in the UK are: Anglian Home Improvements, Everest, Safestyle UK, Zenith Home Improvements and independent double glazing companies (which will depend on where you live).

These findings come from a comparison of the comments from the 2,239 double glazing customers surveyed by Which?, the real user ratings on Trustpilot and our own independent research into each company.

The results are in - who do you want to install your new windows? Check out the table below to see how the top companies compare:

Double Glazing Company
Best for
Rating
Anglian Home Improvements
Best Quality Windows

83%
Everest
Best Customer Satisfaction

93%
Safestyle UK
Cheapest Double Glazing

81%
Zenith Home Improvements
Best Warranty Period

76%
Independent Double Glazing Companies
Best Value for Money

86%


Our window experts compared each option based on what matters most to you: value for money, quality of windows, quality of installation, warranty period and customer service to help you find the best option for you.

Here is how the top double glazing companies scored for the most important criteria:

Double Glazing Company
Window Quality
Installation Experience
Value for Money
Customer Service
Anglian
Everest
Safestyle UK
Zenith
Independents


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1. Anglian Double Glazing

Best Quality Windows

best double glazing by anglian home improvements

  • Trustpilot rating: Great (from 9,518 user reviews)
  • Which? customer score: 63%

Anglian Windows was first started in 1966 and 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.

Double glazing offered: Anglian offers a wide range of window styles in aluminium, timber, wooden and uPVC frames, with double glazing, triple glazing and secondary glazing available.

Efficiency rating: Anglian windows come with an A to A++ efficiency rating for standard uPVC windows and at least a B rating for all others.

Why Anglian? Anglian gets top marks for for the quality of its double glazed windows and installation service.

  • "Competitively priced, delivered on time and professionally fitted. High quality product." - Mr P. Allen (verified order on Trustpilot)
  • "No issues, excellent final product. Anglian installed multiple bespoke designed windows to our old office block with excellent results." - Mr K. Waddell (verified order on Trustpilot)

Why not Anglian? 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.

  • "Great product overall but let down on tidiness." - Mr M. Jones (verified order on Trustpilot)
  • "Service so far has been slow." - Rachel Jones (verified order on Trustpilot)
  • Pros
  • Windows have an A to A++ efficiency rating
  • Choice of uPVC, wooden and aluminium window frames
  • Choice of 7 different window styles
  • Windows carry the ‘Made in Britain’ marque
  • Cons
  • More expensive than other companies
  • Some issues with customer service
  • A broken boiler means no central heating



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2. Everest Double Glazing

Best Customer Satisfaction

best double glazing by everest

  • Trustpilot rating: Great (from 5,261 user reviews)
  • Which? customer score: 57%

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 and all 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.

Double glazing offered: Everest specialises in double glazing, triple glazing and secondary glazing for most types of windows.

Energy efficiency: All Everest windows enjoy at least a B rating by the BFRC and A for uPVC windows.

Why Everest? The majority of its customers have been happy with the customer service they received.

  • "Delighted with our purchase - came up to our expectations and fitting team were excellent." - Patricia Evans (verified order on Trustpilot)
  • "Can’t fault service, from initial survey to fitting. Would definitely recommend." - Ms Bartlett (verified order on Trustpilot)

Why not Everest? Some customers have been dissatisfied with the poor quality of the company’s complaints handling.

  • "Nice windows and doors, but I’m getting annoyed with the lack of response to my complaint." - John (verified order on Trustpilot)
  • "Not as efficient as I expected." - Thomas Hinks (verified order on Trustpilot)
  • Pros
  • Above average customer feedback
  • Windows have an A+ efficiency rating
  • Choice of 5 different window styles
  • Choice of uPVC, wooden and aluminium window frames
  • Cons
  • More expensive than rivals
  • Some issues with complaints handling



3. Safestyle UK Double Glazing

Cheapest Double Glazing

best double glazing by safestyle uk

  • Trustpilot rating: Great (from 13,003 user reviews)
  • Which? customer score: 56%

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 and every one 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.

Double glazing offered: Safestyle UK offers its customers a range of popular double glazed window styles, including casement and sash windows.

Energy efficiency: All Safestyle windows are A-rated and its new Eco Diamond range of glass (recommended by the Energy Saving Trust) is available in most of its window styles.

Why Safestyle UK? Safestyle's customers like 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.

  • "Excellent service from beginning to end. The product is first class and very good value for money." - Glen Chenery (verified order on Trustpilot)
  • "Totally professional and windows that look beautiful." - Lizzy Justice (verified order on Trustpilot)

Why not Safetyle UK? Some customers have had issues with Safestyle UK's customer service.

  • "Beware of their after sales service." - James Rutherford (verified order on Trustpilot)
  • "Nice windows, shame about the customer service." - Cliff Hilton (verified order on Trustpilot)
  • Pros
  • Guarantees to charge less than other companies
  • Choice of 5 different window styles
  • Nationwide coverage across England and Wales
  • Quotes valid for 12 months
  • Cons
  • Only offers uPVC window frames
  • Some customer service complaints




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4. Zenith Double Glazing

Best Warranty Period

best double glazing by zenith

  • Trustpilot rating: Average (from 917 user reviews)

Since 1969, Zenith Home Improvements has been installing over 50,000 windows each year and it's now one of the largest double glazing companies in the UK.

While the quality of Zenith's windows is decent, some customers have raised issues with the installation process, including windows being the wrong size or shape and fitters leaving a mess.

Double glazing offered: Zenith specialises in uPVC products and manufactures its entire range of windows in this type of frame material.

Energy efficiency: For those more conscious about the environment, Zenith has introduced its EcoTherm range of A-rated energy efficient windows, made from a recycled uPVC plastic.

Why Zenith? Zenith offers good quality windows and double glazing installers who know what they are talking about.

  • "I always said I have been satisfied with the work and would recommend Zenith to anyone." - Daphne Ellis (verified order on Trustpilot)
  • "My windows with a 10 year warranty are still great after 23 years." - Jessica Thurtell (verified order on Trustpilot)

Why not Zenith? Customers have had problems with long delays waiting for installation, along with slow response times for fixing faulty or damaged windows.

  • "Product is good quality but sales team are very pushy to sell." - Mr D. Chetcuti-Ganado (verified order on Trustpilot)
  • "Quick to take order and fit but very poor after sales service. " - Maureen O'Connor (verified order on Trustpilot)
  • Pros
  • 15 years warranty with the Carefree Agreement
  • Windows made from recycled plastic
  • Choice of 5 different window styles
  • Quotes valid for 24 months
  • Cons
  • Only offers uPVC window frames
  • Some customer service complaints



Get a Double Glazing Quote for Your Home


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5. Independent Double Glazing Companies

Best Value for Money

independent double glazing companies

  • Which? rating: 86%

Will a local double glazing company be right for you? The best independents near you will depend on where you live, and the quality will vary. But Which? gave them a higher customer score than some of the best known double glazing suppliers - 86% of customers were satisfied (compared with 63% for Anglian).

Why go independent? Independent double glazing companies are known for delivering value for money and working hard to keep their customers happy. Here is a sample of customer quotes from a selection of independent suppliers around the UK:

  • "Very pleased with the result. Job was completed on time, and within the quote." - John Huxtable (verified order on Trustpilot)
  • "We are very happy with the work. They were neat, friendly, polite and efficient." - Ken Thompson (verified order on Trustpilot)

Risks of going independent: Independents tend to be rated lower than established brands for after sales support.

  • "Work completed to a high standard, but at £480 for two and a half hours work very expensive." - Brian Wilson (customer comment on TrustATrader)
  • "They take cash only, upfront and in full, no receipt or invoice issued. " - Lucy Davies (Google user review)
  • Pros
  • 15 years warranty with the Carefree Agreement
  • Windows made from recycled plastic
  • Choice of 5 different window styles
  • Quotes valid for 24 months
  • Cons
  • Only offers uPVC window frames
  • Some customer service complaints



Get a Double Glazing Quote for Your Home


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How Do You Choose the Right Double Glazing Company For You?

Getting double glazing is an investment, so you want to know the company you go for ticks the right boxes for you. To help you decide, here are the 4 key questions to ask yourself:

  1. What window style do you have in mind? - Not all double glazing companies fit all types of windows - below we'll help you check which ones do.
  2. What window frame would you like? - Do you want the look to be wooden, uPVC or aluminium? Most companies work with these common materials, but it's good to have an idea of what you want to get the most accurate quote.
  3. How energy efficient are the windows? - It's great to have a heart for the environment, but there's even more to going green than that. Energy efficient windows will help you cut your energy bills, as they keep more heat in.
  4. How long is the double glazing warranty? - All the double glazing suppliers we recommend offer good quality windows, but for peace of mind it's good to know you're protected for the long term.

1. Window Styles

Windows come in a range of different designs and opening styles to suit the facade of different homes. Casement windows are the most popular style in the UK, but bay and sash windows are also common. Read on to find out more about the most popular window styles and which double glazing companies offer them.

  • Bay: Bay windows are made up of three windows that are arranged at sharp angles to extend beyond your home’s exterior wall. The windows can project at 45 degree angles, or at 90 degree angles to form a box bay window. Bay windows allow you to enjoy an extended view of the outdoors, and can even provide an additional seating area within your room.

  • 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.


The table below shows you what window styles the best double glazing companies offer:

Double Glazing Company
Window Styles
Anglian Home Improvements
Bay, Casement, Cottage, Sash, Shaped, Tilt & Turn
Everest
Bay, Casement, Dual Turn, Sash, Tilt & Turn
Safestyle UK
Arched, Bay, Casement, Sash, Tilt & Turn
Zenith Home Improvements
Bay, Bow, Casement, Sash, Tilt & Turn



2. Window Frames

There are 3 main types of window frame material available in the UK: wooden, uPVC and aluminium. 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. 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's 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.

  • 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.

  • 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.


The table below shows you what window frames the best double glazing companies offer:

Double Glazing Company
Window Frames
Anglian Home Improvements
Aluminium, uPVC, Wooden
Everest
Aluminium, uPVC, Wooden
Safestyle UK
uPVC
Zenith Home Improvements
uPVC



3. Window Efficiency and Safety

The National Fenestration Rating Council (NFRC) will give your new windows are given an energy efficiency rating. This ranges from A++ (very efficient) to G (inefficient) using a ‘rainbow’ rating label, similar to those found on electrical appliances around your home.

Why is it important? The more efficient a window is, the better it will keep the heat in and the cold out. 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 if you're ever in doubt.

Plus, we recommend picking a double glazing installer that's on the Competent Persons Scheme, which means the people who fit your new windows can certify your double glazing complies with building regulations, as set by the Fenestration Self-Assessment Scheme and Glass and Glazing Federation.

You'll also want to ensure your new double glazed windows meet or exceed the British Security Standard. Secured by Design (SBD), an official police security initiative, endorses windows which have achieved certain standards of security, including burglary resistance. This means they’re harder to break and help protect your home from break-ins.

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

Double Glazing Company
Window Efficiency
Number of Windows Endorsed by The Energy Saving Trust
Number of Windows Endorsed by Secured by Design
Anglian Home Improvements
A to A++
14
4
Everest
A+
5
0
Safestyle UK
A
2
2
Zenith Home Improvements
A
2
0



4. Window Warranty

What does a window warranty cover? A warranty is designed to protect you from having to pay for any repairs or replacement windows should yours break or get damaged during the warranty period.

A window warranty usually won’t cover issues relating to normal wear and tear, improper handling, or modifications to the window made by anyone other than the installation company, however.

Do I need one? Providing a warranty period for your windows is not mandatory, but any reputable double glazing company should offer a generous warranty.

The table below shows you the window warranty periods of the best double glazing companies:

Double Glazing Company
Window Frames
Anglian Home Improvements
10 years
Everest
10 years
Safestyle UK
10 years
Zenith Home Improvements
15 years


The warranty period of a window is a good indication of its quality. The longer a window’s warranty period, the more faith a company has that it’s well-made and won’t break.

Always choose a double glazing company that offers a long warranty period on its windows - all the brands in this list provide generous warranties.


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Best Double Glazing Companies: The Verdict

If you’re in need of new windows for your home, then there’s plenty of good quality double glazing companies for you to choose from. The best option for you just depends on what you're looking for.

Whether you want ultra-energy efficient windows that will help reduce your heating bills, excellent customer support and warranty periods, or simply want to get great value double glazing that won’t break the bank, there’s a window company for you.

The best double glazing companies in the UK are:

  1. Anglian Home Improvements: Best quality double glazing
  2. Everest: Best customer satisfaction
  3. Safestyle UK: Cheapest double glazing
  4. Zenith Home Improvements: Best warranty period
  5. Independent Double Glazing Companies: Best value for money

To get a personalised double glazing quote, just plug some brief details this short quote-finder form with some basic information about yourself and your home.

One of our trusted partners will then get in touch with you to arrange a home visit and provide you with a free no obligation quote.


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FAQs

Should you use a local double glazing company?

Yes, many homeowners choose to use a local double glazing company. The main benefit of this is that their windows are likely to be high quality, since small firms have to rely more heavily on recommendations to attract customers. You’ll probably find that they offer a more “personal” service and competitive prices, too.

If you choose to use a local double glazing company, make sure they’re registered with FENSA. This ensures that they comply with the Government’s building regulations.

How long does double glazing last?

Double glazing typically lasts about 20 years before it needs replacing, but it can have a lifespan anywhere between 15 and 35 years depending on the quality of the windows, how well they are installed, and their location in your home.

If your windows let in drafts and cold air, have condensation between the panes of glass, or show signs of visible damage such as broken locks or handles, it’s probably time to replace them.

How does double glazing work?

Double glazed windows are made up of a frame that is fitted with two panes of glass. Between the two panes of glass is a tiny gap filled with air or a natural gas such as argon. This acts as an insulating layer, helping to keep the noise out and the heat in, while the two panes of glass make the window much more secure.

How much does double glazing cost?

The cost of double glazing is affected by the style, size and number of windows you have installed, but you should expect to pay between £400 and £600 per window. Installing new double glazing in a two-storey house will cost about £5,000 to £8,000.

How much can you save with double glazing?

Double glazing improves your property’s insulation, meaning you’ll rely less on your central heating to warm your home. As a result, you can save money on your energy bills.

It’s estimated that by switching from single glazing to double glazing with an energy efficiency of A+, you can save up to £110 per year on your energy bills.

Is double glazing worth it?

The short answer for many people will be yes. Double glazing not only improves your property’s energy efficiency (which cuts your utility bills), but it also improves your home’s security and helps to insulate against unwanted noise from outside.

New double glazing has been found to increase a property’s market value by up to 10% as well. So despite the initial costs, it’s well worth installing new double glazing for your short term comfort and longer term savings.

How did you pick the best double glazing companies?

With thousands to choose from, it was not an easy task, so we got help from the experts as well as real customers just like you.

We combined the findings from Which?'s survey of 2,239 UK homeowners about their recent experience with various double glazing companies, thousands of verified Trustpilot reviews and in-depth market research from our own window experts to bring you the ultimate list of the top double glazing companies in the UK.

We focused on what our readers tell us matter most to them when choosing a new window installer: the quality of the windows, the professionalism of the installer, value for money, customer service, the window warranty and energy efficiency, plus we've selected the best company for you whatever your preference.


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What's the easiest way of comparing double glazing quotes?

Our expert double glazed window reviews use independent research from the most trusted sources: Which? reports, real-life user reviews on Trustpilot, and our own surveys of window installers and homeowners should help you be ready to compare prices from the UK's leading double glazing providers.

Here at Eco Experts, we are helping our readers get free quotes in three easy steps:

  1. Fill in our form to tell us what you want
  2. Get matched and talk directly with the best double glazing companies near you
  3. Compare the quotes and see how much time and money you save

Just tap your location on the map below to get the ball rolling with free double glazing quotes.



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