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Last updated: 13 March 2024

Best Double Glazing Companies 2024

best double glazing companies in the UK

Windows are always an essential part of any house, providing natural lighting, ventilation and insulation. Therefore, choosing the right new window in line with your personal circumstances can have a significant impact on your energy bills, comfort and overall quality of life.

In this article, we’ll go through the best double-glazing companies in 2024 since with so many options available the task of doing the research by yourself can be an overwhelming experience. Therefore, it is very important to compare companies based on the latest consumer reviews, special deals or financial assistance. Doing so will help you find the best double-glazing companies in the UK that meet your needs and budget.

As you begin your search, you may wonder which is the biggest window company in the UK. Well, according to the most recent data, Everest is currently the largest window company in the country, with branches all across England, Scotland, and Wales. Following Everest, we can list Anglian Home Improvements and Safestyle UK. 

However, keep in mind that the biggest doesn't always mean the best. Smaller companies in your city can also offer high-quality products and services at lower prices.

To find the best local double glazing companies, start by asking for recommendations from family and friends. You can also search online for "window replacement companies near me" and check their customer reviews, pricing, and service offerings.

An easier and more reliable way would be to let us at GreenMatch help you find top local suppliers offering attractive double-glazed window prices. We will only match you with installers guaranteeing the highest quality and energy efficiency standards.

Click the button below, and we will send you up to 4 quotes from double-glazing companies in your area. Our service is 100% free, and you are not obliged to accept any quotes you receive.

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Which is the Best Double-Glazing company in the UK?

Many companies are competing to be the best double-glazing company in the UK, which is actually good news for homeowners as they have a wide range of options to choose from. However, from the biggest names to the local companies, choosing the right one can be an overwhelming task.

To help you with that, we have put together a list of the top 5 double-glazing companies in the UK. We based our selection on their Trustpilot rating, special offers, financial assistance options, available warranties or guarantees, and location.

Our list of the best double-glazing windows companies includes Safestyle UK, Everest, Anglian Home Improvements, CR Smith, and First Home Improvements. Each of these companies has a unique offering, making them stand out in the crowded marketplace.

Below you can find a table comparing some of the best double-glazing companies in the UK:

Comparison of the Best Double Glazing Companies in the UK
CompanyTrustpilot rating (January 2024)Special OffersFinance OptionsWarranty/GuaranteeLocation
Safestyle UK4.1 out of 5 (based on 48,000+ reviews)“Fit this winter and Save Up to 20%”3 options of finance available10 years on all productsAcross England and Wales
Everest4.4 out of 5 (based on 12,000+ reviews)- Triple Glazing for the Price of Double Glazing
- Multi-buy Savings
Low rate finance options available (10 and 15 years)- 10-year option
- 20-year option
- Lifetime option (for condensation and fogging)
Across England, Scotland, and Wales
Anglian Home Improvements3.9 out of 5 (based on 31,000+ reviews)- Up to £250 off upon online orders
- Up to £250 cash reward on recommendations to friends (unlimited)
Low rate finance option available (3 years) with a minimum deposit of £199- 10 years on parts and labour on all windows
- 10 to 15 years on all gas-filled sealed units
England, Scotland, and Wales 
CR Smith4.8 out of 5 (based on 3,900+ reviews)Monthly updated special offers section- “Order now, Pay in 2024” option
- Improved finance rate (limited)
10 years on product and installationPrimarily in Scotland
First Home Improvements4.5 out of 5 (based on 4,300+ reviews)Up to 30% off across their whole product range£100 deposit, interest-free credit options available12-year warranty across the whole range of windows Across the counties of England

Top 5 double glazing companies in the UK explained

Safestyle UK

Safestyle UK, for instance, has 20+ years of experience installing windows and doors in England and Wales. It has a Trustpilot rating of 4.1 out of 5, based on 48,000+ reviews.

The company also provides customers with finance options, with three different payment plans available. The most popular ones are the ‘24 Months Interest-Free Credit’ and the ‘Buy Now Pay in 12 Months’ plans. Furthermore, Safestyle UK offers a 10-year warranty on all its products, which assures customers of the high quality of their work.


Everest is another leading double-glazing company in the UK. It has been in business for half a century, operating across England, Scotland, and Wales. In addition to being accessible to homeowners in many locations, the company provides its customers with high-quality products and services, as shown by its Trustpilot rating of 4.3 (12,141 reviews).

Everest features an extensive range of finance alternatives, including low-rate finance options for 10 and 15 years. In addition, you can benefit from special offers such as the ‘Triple Glazing for the Price of Double Glazing’ deal or the ‘Multi-buy Savings’ option.

Everest offers 10-year and 20-year guarantee options for their products. There is also a lifetime guarantee against condensation and fogging.

Anglian Home Improvements

Alongside Everest, Anglian Home Improvements is one of the biggest double-glazing companies in the UK. It was founded in 1966 and, since then, has been offering competitive prices and deals. For instance, the company currently offers an ‘up to £250 off’ deal on online orders and ‘up to £250 cash rewards’ for recommendations to friends.

Anglian Home Improvements also offers a 10-year guarantee on parts and labour for all its windows and a 10 to 15 years guarantee on gas-filled sealed units. The company also provides a low-rate finance option for three years; however, this credit is subject to affordability, status and lending criteria with a minimum deposit of £199.

CR Smith

For homeowners in Scotland, CR Smith is an excellent choice. This Scotland-based double glazing company has a remarkable Trustpilot rating of 4.9, based on 3,257 reviews. Its website includes a monthly updated section with the company’s latest special offers.

CR Smith provides a ten-year warranty on products and installation, which gives homeowners peace of mind. You can also opt for low-interest credit, but it is subject to status and affordability.

First Home Improvements

If you live in England, First Home Improvements is another company you can consider if you are looking for new or replacement windows. It has a Trustpilot score of 4.4 and offers up to 30% off on its entire product range. First Home Improvements guarantees high-quality standards, as suggested by its 12-year warranty on all its windows.

Moreover, it offers interest-free credit options with a £100 deposit to help you finance your double-glazed windows.

What is the biggest window company in the UK?

The biggest window company in the UK is Everest, backed by an impressive track record and market dominance. One of the reasons for Everest's success is its commitment to quality, energy efficiency, and innovation.

According to Everest’s website, they cover the entirety of England, Scotland, and Wales. Besides double-glazed units, its product range also includes triple-glazing, uPVC and timber frames, and conservatories. Customers can choose from over 20 different colours for their windows, including wood grain finishes on uPVC.

As for their workforce, Everest employs over 1,000 people in various roles, from sales and installation to customer service and support. Additionally, they have won multiple awards for their products and services.

Everest awarded accreditations include:

    • Made in Britain

This accreditation shows companies' commitment to British manufacturing and design.

    • FENSA

The Fenestration Self Assessment Scheme (FENSA) is the largest and longest-established scheme for installers that are trusted by Local Authorities, industry and Government. Firms awarded with this accreditation guarantee that installations are fully compliant with Building Regulations.

    • Quiet Mark

Quiet Mark is the international approval award associated with the UK Noise Abatement Society charitable foundation. It encourages companies to prioritise noise reduction and find solutions. Everest’s double-glazed casement windows have earned this accreditation.

    • Secured by Design

Secured by Design is a UK police initiative promoting products that help reduce the risk and fear of crime. It's the only form of Police approval for products in the UK.

    • TrustMark

TrustMark is the only Government endorsed scheme for trades in and around the home. This accreditation gives customers reassurance of quality and protection from rogue traders

    • BFRC

The BFRC is the UK's national system for rating energy-efficient windows and doors. The WER (Window Energy Rating) scheme is used to measure energy efficiency levels from A++ to E. Everest’s uPVC casement windows are rated A+, while its triple glazing achieves an A++ rating.

    • BSI

The British Standards Institute (BSI) is the National Standards Body of the UK. Everest holds 8 BSI-issued Kitemark certifications for meeting exceptional quality and safety standards on different window and door models.

Which window company is the best?

Which window company is the best?

Size, number of employees, awards and accreditations notwithstanding, determining which window company is the best is not a straightforward task. Some may have a better reputation, while others may offer more affordable pricing or have a wider range of products. Ultimately, the best company for you will depend on your specific needs and budget.

For instance, as we described above, Everest may have many benefits but also drawbacks. In this case, the company's reputation usually comes alongside higher costs of its products. Thus, Everest double-glazing products are probably not the most affordable. Other companies, even small ones, may offer high-quality units at a (much) lower price.

How to Find the Best Local Double-Glazing Companies

Researching and considering all the factors that are important to you are the most important steps when searching for the best local double-glazing companies. Whatever your strategy is, you should always pay attention to companies’ customer service, product quality, pricing, warranties, and financing options.

Additionally, you can check online reviews, industry awards, and the company's overall reputation. Also, compare windows installation costs, as this is proven to be one of the best ways to save money.

At the end of the day, the right window company for you is the one that provides the best balance of quality, affordability, and customer service. Our general advice is: “don't rush it”. Take your time and compare different companies to find the one that best meets your needs.

Follow these 4 tips while choosing a double-glazing company:

choosing a double-glazing company

At GreenMatch, we can get you in touch with up to 3 top-rated suppliers in your area. We ensure that the local double glazing companies we match you with provide the highest quality and energy efficiency standards.

Which is the best double glazing in the UK?

In short, the best double-glazing you can find in the UK will depend on what you want to achieve by installing it. Is it better insulation, energy efficiency or soundproofing? There are options designed to meet almost every need.

Generally speaking, double glazing is the glazing process whereby two layers of glass are fitted so that a small gap of air remains between them. The gap is usually 12 to 16 mm wide and is filled with either normal dry air or, in some cases, argon, xenon, or krypton gas. This gap helps to improve insulation by reducing heat transfer and noise pollution from outside.

Watch how double glazing works in this 2-min video:

DOUBLE GLAZING  - What is it and how does it work? │GreenMatch

If a third layer of glass is added, then we are talking about triple glazing. The additional layer of glass provides even better insulation and noise reduction than double-glazed units.

Double and triple glazing can consist of different types of glass. You could choose, for example, toughened or laminated glass, which can provide additional security. Another option would be low-emissivity (Low-E) glass, which can help improve your home’s energy efficiency. Other glazing alternatives include annealed, acoustic, self-cleaning, solar control, fire-proof and decorative glass.

What is the most effective double glazing?

However, if energy efficiency is what concerns you the most, then the best windows double glazing or the most effective double glazing for you will necessarily include Low-E glass. Also known as energy-saving glass, this glass option is the best for cold regions where much energy is used to heat the house.

It features a special coating that helps reflect heat back into the home rather than allowing it to escape through the glass. It also reduces the amount of heat that enters the home on hot days.

Windows made out of this type of glass are probably the most energy-efficient windows. They can reduce energy loss from heat conduction by as much as 50% compared to standard glass. If you consider other factors such as energy tariffs, energy consumption, and your house size, Low-E glass can help reduce energy costs by up to 25%.

Compare the Best Double-Glazing Companies in the UK

In summary, the UK has a competitive double-glazing market with many options to choose from. According to our research, the top 5 double glazing companies in the UK —among the most popular ones— are Safestyle UK, Everest, Anglian Home Improvements, CR Smith, and First Home Improvements.

Each company has a unique offering that sets it apart from others in the marketplace. For instance, Safestyle UK, with over 20 years of experience, offers special discounts of up to 20% and provides finance options, including a 24-month interest-free credit plan. Everest, in business for half a century, features an extensive range of finance alternatives, special offers, and a lifetime guarantee against condensation and fogging.

Anglian Home Improvements, in business since 1966, offers up to £250 off deal and provides a low-rate finance option for three years. CR Smith, a Scotland-based company, has an impressive Trustpilot rating of 4.9 and provides a ten-year warranty on products and installation. Lastly, First Home Improvements offers up to 30% off on their entire product range and interest-free credit options.

Overall, each company has its unique benefits, making it challenging to select the best double-glazing company in the UK. This is considerably more difficult if you also want to consider (lesser known) double glazing companies in your area, which may offer better value for money.

At GreenMatch, we know that searching for local suppliers and installers can be a tedious, time-consuming process. This is where our service can be helpful to you. It is 100% free and you can feel confident that the installers we connect you with are qualified.

By clicking the button below, we'll connect you with up to 4 trusted window installers available in your area, whose quotes you can then objectively compare so you can feel assured that you're choosing the best deal. Click the button below to get your free, non-binding quotes now.

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