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Our guide highlights the top double glazing companies in the UK, offering insights into costs, benefits, and everything you need to know about installing double glazing in your home.
Looking up ‘double glazing window companies near me’ and coming up short? Unsure what to look for in a window installer, and how to weed out the good from the bad?
We’ve done the heavy lifting for you. In this guide, we’ve shortlisted the best double glazing installers in the UK, comparing their reputation, window prices, customer service and product quality to help you make the right decision for your household.
These top installers not only offer high-quality, durable window construction but also provide enhanced security features, energy efficient solutions, and competitive windows prices. They back their work with reliable warranties, ensuring long-term satisfaction.
To obtain a fast, free double glazing quote, simply provide your details below and we will connect you with reputable local installers in your area. This ensures you receive the best service and value from trusted professionals.
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To find the best window installers in the UK, we carefully evaluated dozens of providers, comparing their prices and warranties. We also assessed their selection of window materials, styles, and additional features, as well as their recent customer reviews and feedback on Trustpilot.
From our hours of research, we compiled a list of the top double glazing installers in the UK.
| Anglian | Britelite | Britannia | |
|---|---|---|---|
| Approximate price range per window | £275 – £1,000 (price match on uPVC windows) | From £550 | £300 – £750 |
| Trustpilot score | 3.9 stars | 4.5 stars | 4.3 stars |
| Areas covered | Nationwide | South East | Southern England |
| Warranties | 10-year guarantee for all parts and labour; 10-15 years for sealed glass units | 10-year transferable guarantee | 10-year transferable guarantee |
| Available materials | uPVC, aluminium, wood | uPVC, aluminium | uPVC, aluminium |
| Energy rating | A++ for uPVC; A for timber and B for aluminium | A+ for uPVC and aluminium | A++ for uPVC and aluminium |
| Secured by Design certified | Yes on some products | Yes on some products | Yes |
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Different window companies offer varying warranty terms. The provider with the shortest warranty featured in this guide is 10 years, which is roughly half the average lifespan of uPVC double glazing.
The dimensions and frame materials you choose all influence the cost of double glazing windows. On top of that, each provider prices their products differently. It’s worth noting there is help to cover the cost of windows in the shape of double glazing government grants.
As well as increasing your property’s value, double glazing can enhance the energy efficiency of your home. Replacing your windows can save you up to £235 a year on your energy bills, depending on the energy efficiency of the windows you choose.
The companies we selected install double glazed windows accredited by Secured by Design (SBD), which ensures they meet police-approved security standards.
Anglian’s energy-efficient windows come in a range of styles and materials, including wood and aluminium. The company also provides uPVC windows, which are available in several finishes. Decorative glass options and advanced safety features – such as key locking handles, multipoint locks, excluder devices and shoot bolt locks – are also available.
In the 1960s, the company was founded as Anglian Windows, and it has since become a market leader. Anglian fits more than half a million products in the UK every year, all bearing the Made in Britain trademark. Prioritising economic and environmental sustainability, the company takes part in the Recovinyl Plus PVC recycling initiative, offering you up to £1,000 off new Anglian windows and doors when you recycle your old ones.
Anglian’s fair payment options, impressive accreditations and glowing reviews earned it excellent marks for its double glazing products and services. The company provides windows in various styles, including tilt and turn windows, casement, sash, flush, bay and cottage. A range of Scandinavian-inspired styles and colours is also available, including uPVC frames with wood finishes.
Like many double glazing companies, Anglian doesn’t publish its prices as each installation is tailored to the customer. The company does offer a price-match guarantee on uPVC windows, providing a like-for-like quote is presented.
Per our research, the average cost of a 600mm x 900mm window from Anglian is as follows:
| Material | Cost |
|---|---|
| uPVC | £275 – £630 |
| Aluminium | £525 – £675 |
| Composite | £600 – £685 |
| Wood | £890 – £1,000 |
Based on Anglian’s Trustpilot reviews and its score of 3.9 out of 5 stars, the company has a mixed reputation. Many customers praise the wide range of window styles, custom designs, and reliable installation. Positive reviews also highlight its competitive pricing.
However, common complaints revolve around communication issues and after-sales support, some users expressing dissatisfaction with delayed responses or follow-ups on repairs. Despite the mixed feedback, Anglian remains a popular choice due to its strong market presence.
Anglian’s beautifully designed bespoke products are a great option for cash buyers, and there is an impressive variety of styles. However, although the company provides some financing options, some of its competitors have a more favourable annual percentage rate (APR) than Anglian’s 12.9 per cent. Also, some brands – such as Britannia – also offer interest-free credit and “buy now, pay later” plans.
Anglian’s safety features, especially its locking systems and highly coveted SBD accreditations, are ideal if you’re concerned about security. The company’s wood windows and doors also hold several accreditations and licences, including Forest Stewardship Council certifications. Anglian’s excellent reviews and ratings, versatility, pricing, payment options and solid guarantees led us to choose this installer as the overall best double glazing company.
Read our full Anglian windows review.
With over 50 years in the double glazing industry, Britelite Windows focuses on energy efficiency and security – as demonstrated by its available 10-point lock system. The company’s accreditations include the BSI Kitemark for window installation.
We included Britelite in our shortlist mainly because of its transparent price policy, which means no hidden fees, as all quotes include VAT and fitting costs. Many online reviews suggest Britelite’s prices are more affordable than those of its competitors, and customers have also reported that their installation resulted in impressive energy savings.
Britelite provided us with the average prices for a standard casement window (excluding installation and labour):
| Material | Average cost |
|---|---|
| uPVC | From £550 per window |
| Aluminium | £600 – £700 per window |
| Composite | From £1,150 per window |
Britelite receives generally positive reviews on Trustpilot, with customers commenting on its professional, polite installers, fair prices, and their overall satisfaction with the finished product. Its score of 4.5 out of 5 consists of 81 per cent awarding 4 or 5-star reviews, and 14 per cent giving 1 and 2 stars based mainly on problems with delayed installations and communication issues.
If you’re on a budget and want to avoid hidden fees, Britelite Windows is a good option. Your quote is VAT-inclusive, thanks to the company’s competitive, transparent pricing, so you won’t have to worry about additional costs when making your decision. Unlike some of its competitors, Britelite receives praise in online reviews for its straightforward sales tactics. Buyers can also enjoy cost savings through boosted energy efficiency after installation.
However, Britelite’s representative APR is 12.9 per cent, and there aren’t many payment options. The company also has less choice of materials and design features, and it only provides a standard 10-year warranty.
Read our full Britelite windows review.
Britannia Windows is a well-known family business that was founded in 1982. Serving customers in Kent, Sussex, Essex, Surrey and London, the company uses a network of installers to ensure quick delivery. Britannia Windows gets mixed reviews online, but it responds directly to negative reviews and has a solid reputation overall. If you’re generally busy during office hours, you may find the company’s extended contact centre service hours (Monday to Friday, 8.00am to 8.00pm) quite helpful.
If you prefer using credit, Britannia has multiple finance options and extremely flexible payment terms. The company also has an extensive range of window designs, styles and colours to choose from.
Pricing for Britannia windows is not available online, but we were able to identify a price range for their products using customer reviews. Britannia’s costs are similar to those of Anglian, and most reviewers rate Britannia’s prices as “fair” or “reasonable”.
| Material | Cost (excluding installation) |
|---|---|
| uPVC | £300 – £600 per window |
| Aluminium | £550 – £750 per window |
Britannia is rated 4.3 stars out of 5 on Trustpilot with 63 per cent of 5-star reviews, and 24 per cent of 1-star review. Satisfied customers mention great service, reporting that any of their issues were quickly rectified. However, some reviews highlight unfinished installations, and poor after-sales care.
Many homeowners rely on payment plans as new windows are a significant investment. Britannia Windows is a good option for such buyers, as they can take advantage of low-cost monthly financing – a “buy now, pay later” repayment scheme with 19.9 per cent APR, or a 5 or ten year repayment option with an APR of 11.9 per cent.
With showrooms in convenient locations around South East England, Britannia has a reputation for friendly service and efficient installation, making it a solid all-round option. Although it’s a smaller business than some of the others on our list, Britannia still has an impressive range of window designs and colours.
Read our full Britannia Windows review.
| Crystal | CR Smith | Everest | First Home Improvements | Safestyle | |
|---|---|---|---|---|---|
| Approximate price range per window | From £330 | £400 – £1,200 | £275 – £1,220 | £400 – £700 | £350 – £1,250 |
| Trustpilot score | 4.7 stars | 4.9 stars | 3.5 stars | 4.5 stars | 3.9 stars |
| Warranties | 10-year guarantee | 10-year guarantee | A 10- to 30-year guarantee, depending on the material | 12-year guarantee | 15-year transferable guarantee |
| Energy rating | A+ | A | From A++ to B depending on the material | A+ | A |
| Available materials | uPVC | uPVC and timber | uPVC, aluminium, wood | uPVC | uPVC |
| Secured by Design certified | Not currently accredited | Yes | Yes | Not currently accredited | Not currently accredited |
| Review | Crystal review | CR Smith review | Everest review | First Home Improvements review | Safestyle review |
Following Safestyle entering administration in October 2023 and Everest in April 2024, both companies are now part of Anglian Home Improvements. While all three brands continue to operate separately, they now share the same parent company.
There are plenty of horror stories around about ineffective fittings, noisy vents and property damage from careless installation online, so it’s important to check out the service quality of any double glazing installer.
To get a good idea of the range of prices and products you can opt for, we advise to collect quotes from both national and local window installers. As most companies supply similar products, focus on a provider’s reputation and customer service when making your decision. There are some advantages to choosing a local double glazing installer, such as a friend or relative being able to share their experience with the company. However, we wouldn’t recommend accepting advice from strangers in local social media groups.
The following factors are important to keep in mind when choosing a window installer:
Look for a well-established company that has been in business for several years – the longer, the better. This is a good indicator of expertise and reliability, which are valuable during the installation process and for ongoing support.
Read all the testimonials and customer reviews you can find, and check out third-party websites. While every installer will have some negative reviews, the company’s response to such criticism can help you gauge its level of professionalism. Good aftercare service is more likely with companies that are willing to correct any issues. Meanwhile, an argumentative response may be a warning sign.
Check if local installers have photos of their completed projects available for prospective customers to look at. Local companies may even be able to tell you which houses they’ve worked on in your neighbourhood, allowing you to see the quality of the windows and installation for yourself. Visit the company’s website and look for a gallery or portfolio page, or check their social media profile.
Ensure the company is FENSA-registered and compliant with building regulations. This will save you time and money, as the company will register your window installation on your behalf. You’ll also have peace of mind from knowing the company has undergone thorough vetting. Once the company finishes your double glazing installation, it should provide a FENSA certificate.
Ensure that your installer provides security measures, such a multipoint lock system, to protect your home, as windows can be an easy access point for burglars.
Check the guarantee. Longer guarantee periods are better, but UK glaziers must offer a minimum 10-year guarantee on their labour and materials.
Ensure the installer provides a free, no-obligation quote. While it’s common for companies to visit a home before providing a quote, they shouldn’t charge for every inspection. Transparent prices and value for money are important, so companies shouldn’t hide extra costs in the fine print.
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As you will typically only go through the process of acquiring double glazing quotes once every few decades, it’s important to get it right.
We spoke to Rebecca Orde, who is a Project Manager specialising in residential development. She frequently assists her clients by obtaining quotes for double glazing installation on their behalf.
According to Rebecca, it’s vital to get a detailed breakdown of what’s involved in a double glazing installation and any associated costs.
“You’ll find with most medium-sized double glazing companies that they have the software to provide really detailed quotes, including specifications such as U-value, size, material, the gas used between the panes and so on. It’s really helpful getting that in-depth overview as well as a price,” she says.
Rebecca recommends obtaining quotes from several FENSA- or CERTASS-approved installers.
“Obtaining 2 or 3 quotes from different installers is ideal for most customers, assuming you’re talking to companies of known quality,” she says.
“Sometimes, you might not receive a response from certain installers. In some locations, there’s a high demand for building work, making it a seller’s market.”
Further to Rebecca’s advice, we recommend seeking out both national and local double glazing installers for quotes. This will help you to compare prices, including the cost of labour. Although some national window companies may subcontract your job to a local installer, it’s still worth getting quotes from both parties.
To ensure you receive an accurate cost estimate, answer the following key questions before you begin contacting installers.
When it comes to your installation timeline, it pays to be flexible, as double glazing companies tend to be busier at certain times of the year. As you might have to wait for your installation, the earlier you book your job, the better.
When discussing a double glazing quote, ask some questions to establish the company’s reliability and expertise. For example:
Knowing how double glazing works can be helpful when you’re looking for a company to install your windows.
Popular since the 1970s, double glazed windows provide excellent insulation and stop draughts. They have 2 panes of glass separated by spacer bars filled with air or gas, allowing daylight to enter and warm your home. The heat then transforms into infrared energy that can’t escape back through the glass, similar to the greenhouse effect. This process, known as solar gain, helps reduce energy bills and lower your carbon footprint by minimising the need for extra heating.
Double glazing windows cost upwards of £520 for a single uPVC casement unit. However, the cost depends on the company you choose, the number of windows you need and the styles you prefer. As uPVC windows are made from engineered plastic, they are generally the most affordable option. The next cheapest is aluminium, and timber is typically the most expensive.
These costs can quickly add up, as the average UK property has 10 windows. Our table below provides approximate costs of different materials and sizes of casement windows. Consider that, on average, tilt and turn windows cost 25% more than casement windows, and sash windows cost 50% more.
| Casement window frame material | 600mm x 900mm | 900mm x 1,200mm | 1,200mm x 1,200mm |
|---|---|---|---|
| uPVC | £520 | £590 | £650 |
| Aluminium | £1,050 | £1,195 | £1,300 |
| Timber | £1,580 | £1,790 | £1,950 |
In this video, we explain the benefits of double glazing and the savings you can achieve. Watch for advice on what to do if you need to fix or replace your windows and how to get financial assistance to pay for installation.
In this video, we explain the benefits of double glazing and the savings you can achieve by choosing it. Watch for advice on how to get financial help to pay for an installation and what to do if you need to fix or replace your windows.
During its rating process, the British Fenestration Rating Council considers every component of double glazing, including the glass, the gas filling the spacing and the manufacturing quality of the unit.
According to the latest building regulations, all new windows should be grade C or higher.
Under the Consumer Rights Act 2015, double glazing companies must supply windows as described and of satisfactory quality, with installations carried out with reasonable care. If standards aren’t met, customers can request repairs or replacements. Reputable companies often provide warranties exceeding 10 years, but terms may vary, so always review the guarantee before proceeding.
Several top UK double glazing installers – including Safestyle (2023) and Everest (2024) – have recently entered administration, casting doubt on the aftercare for their installations. While the Anglian group has incorporated these companies, if a company has no buyer to assume its obligations, guarantees may become void. However, you might still be able to make claims through your insurer if you have an Insurance Backed Guarantee policy.
If you’re on a budget, secondary glazing is a more affordable option than double glazing, as it adds glazed units to existing windows. While it offers less insulation and security, it excels at soundproofing and can even outperform double glazing in that regard.Security
The companies we selected install double glazed windows accredited by Secured by Design (SBD), which ensures they meet police-approved security standards.
Your budget will influence whether you choose double or triple glazing, with triple glazing being around 10-20 per cent more expensive. Triple glazing’s additional pane and air-locked spaces improve energy efficiency, potentially increasing savings by up to 50 per cent, making it a tempting choice for homeowners seeking enhanced insulation.
To assess the best double glazing companies, we based our scoring system on several key factors, combining them into a total score out of 100.
These factors included:
Read more about how we review windows.
