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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.
Are you looking for the best double glazing companies in the UK? To help you make an informed decision, we’ve shortlisted the most reliable double glazing installers by assessing their reputation, window prices, customer service and product quality.
If you’re searching online for ‘double glazing companies near me’, our experts are here to help.
Solid reputations and excellent customer service are key indicators of reliable, trustworthy double glazing installers. 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.
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Our experts conducted thorough research, evaluating and comparing the prices, energy efficiency ratings, and warranties offered by various double glazing companies. We also assessed their selection of window materials, styles, and additional features. To ensure accuracy, we reviewed the most recent customer feedback and ratings on Trustpilot. Using this comprehensive information, we have compiled a list of the top double glazing installers in the UK.
| Anglian | Britelite | Britannia | |
|---|---|---|---|
| Approximate price range per window | £250–£910 (price match on uPVC windows) | From £527 | £250–£605 |
| Trustpilot score | 3.9 stars | 4.5 stars | 3.9 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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Window companies offer varying warranty terms. The shortest warranty featured here is 10 years – roughly half the average lifespan of uPVC double glazing.
The window dimensions, frame materials and supplier all influence the cost of double glazing windows. Prices can be high, even with available double glazing government grants, so we’ve provided indicative costs for each supplier.
As well as increasing your property’s value, double glazing can enhance the energy efficiency of your home, saving you £235 a year on energy bills. To help you maximise these benefits, our experts have researched the energy-efficiency ratings of each company’s windows.
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 designed for each customer. It does offer a price match guarantee on uPVC windows, providing a like-for-like quote is presented.
We discovered that the average cost of a 600mm x 900mm window from Anglian is as follows.
| Material | Cost |
|---|---|
| uPVC | £250–£570 |
| Aluminium | £500–£605 |
| Composite | £575–£625 |
| Wood | £845–£910 |
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, with 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.
| Material | Cost |
|---|---|
| uPVC | £527 |
| Aluminium | £1,050 |
| Composite | £575–£625 |
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 80 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 is not available online, but we identified a price range by 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 |
|---|---|
| uPVC | £250–£500 |
| Aluminium | £500–£605 |
Britannia scores 3.9 stars out of 5 on Trustpilot, with 66 per cent of the reviews being positive, and 31 per cent negative. Satisfied customers mention great service, with any issues quickly rectified. However, other reviews focus on 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.
To assess the best double glazing companies, we based our scoring system on several key aspects, which we used to rate each company, giving them a total score out of 100.
These factors included:
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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.
For some expert insight, we spoke to Rebecca Orde, who is a project manager specialising in residential development. She frequently assists her busy 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:
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.
With plenty of available horror stories about ineffective fittings, noisy vents and property damage from careless installation, make sure you check out the service quality of any double glazing installer.
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. Also check for the following factors before choosing an 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.
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 £250 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 based on the prices per unit from the cheapest and most expensive windows installers. To determine whether a company suits your budget, multiply these prices by the number of windows you want to install.
| Material | Anglian | Britelite | Britannia |
|---|---|---|---|
| uPVC | £250–£570 (A++ rated) | £160–£450 (A++ rated) | £250–£500 |
| Wood | £845–£910 | Unavailable | Unavailable |
| Wood clad | £575–£625 | £475–£625 | £475–£625 |
| Aluminium | £500–£605 | £500–£605 | £500–£605 |
Our analysis compares the prices for 1 double glazed window unit of approximately 600mm x 900mm in different materials. The highest price corresponds to the highest efficiency rating the company offers.
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.
In the past 20 years, significant advances in double glazing technology have resulted in longer-lasting and higher-performing windows. Key improvements include:
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.
According to VELUX, it costs around £980 to replace a roof window, assuming a like-for-like switch. However, this price will be higher if you wish to install a larger window or add a new window to a space that doesn’t already have one. Installers’ rates will also vary depending on the labour and materials required.
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.
Your budget will influence whether you choose double or triple glazing, with triple glazing being around 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.
