The 7 Best UK Double Glazing Companies in 2023

✔ We’ve researched extensively to find the best double glazing companies for you

✔ We settled on seven of the best double glazing companies across the UK

✔ Double glazing saves you money and improves your home's efficiency

Double glazing is one the most effective ways to improve your home’s insulation. So it’s no wonder roughly 75% of UK households have it, despite the high cost of double glazing.

Want to get double glazing, but don’t know which company to go for? We’ve done the research for you by analysing nearly 600 UK double glazing companies. We looked at the top local and national providers, and picked the best ones.

Want to skip the reading and start comparing double glazing prices? We can help — fill in the form with a few details about your home, and we’ll put you in touch with our expert installers. They’ll get back to you with bespoke double glazing quotes for you to compare.

Best for customer satisfaction: Safestyle UK

Safestyle UK is one of the country’s biggest providers of double glazing, completing the largest volume of installations of any FENSA-registered (a government-authorised scheme that monitors building regulation compliance for replacement windows) company in 2022. At this scale you’d expect the quality to drop, as can sometimes be the case when companies reach a certain size.

But this isn’t the case with Safestyle UK, who’ve averaged a very impressive 4.2 out of 5 stars on Trustpilot, based off of more than 44,000 reviews.

A whopping 71% of all reviewers awarded Safestyle UK the full five stars, with the key takeaways being that the company’s fitting teams are tidy, professional, polite, and efficient at completing the job.

It’s a nationwide company too, so you’ll be able to use Safestyle UK for your double-glazing needs wherever you are.

However, a caveat is that Safestyle UK only deals with uPVC windows and doors, so you’ll be limited on your choice of material. But it does mean that if you want uPVC windows, you’ll be using a company that specialises on that material alone.

If you want to see whether you can get double glazing grants to help subsidise your costs, check out our guide.

Pros and cons

Best for finance options: Everest

Double glazing can be expensive, with the average cost of double glazing being £640 per window. That can make financing options very attractive for a lot of households, who want to benefit from double glazing — and all the energy savings — without paying the high upfront costs.

Everest offers one of the best financing options in the business, with customers able to spread costs across a hugely impressive 180 months (15 years).

It’s a good deal better than the three to five year finance options typically offered by most double glazing companies, and the fixed interest rate of 11.9% makes payments easily manageable.

This means a double glazing project that costs £5,000 would see you paying back just £51.87 a month, plus an initial £500 deposit, for a total cost of £9,336.70 after 15 years.

Find out how much double glazing might cost you with our double glazing cost calculator.

Pros and cons

Best for warranty: Clearview

Your average double glazing guarantee is around 10 years, which is a pretty generous amount of time considering the typical double glazed window lasts between 25 and 30 years.

Clearview, on the other hand, looked at that number and thought “yeah, we’ll double that.”

Its 20-year guarantee is industry leading, which is probably why Clearview won the G Award in 2022 (the annual award celebrating and rewarding excellence in the UK glass and glazing industry).

Clearview is clearly confident enough in the quality of its windows, because of all the major double glazing companies we investigated, no others offered a 20-year warranty.

There is a catch though, including the fact that, if your window breaks, you’ll still have to pay a portion of the labour costs after the first 10 years.

Pros and cons

Best for choice: Anglian Home Improvements

Anglian Home Improvements have more than 55 years in the business, and with that experience comes a lot of versatility.

It’s a company capable of delivering any type of window you’d want, whether it’s stylish sash windows for a townhouse, or classic timber frame windows for a cottage (or even a listed building).

If you need a custom shape, Anglian Home Improvements are more than capable too. Examples on its website include curved, circular, square, or triangular – but Anglian stresses that there’s no limit to what shape you can choose.

This flexibility is ideal for homeowners with properties that have unique aesthetics and want windows that really stand out.

Pros and cons

Best for security: First Home Improvements

Double glazing already adds an extra layer of security to your home — especially uPCV windows — but there’s nothing wrong with being even more secure.

First Home Improvements certainly think so, which is why it prioritises security as one of its key selling points. All windows from First Home Improvements come with locks built by Yale, though the pièce de résistance is the patented Blade Lock.

The Blade Lock is what makes windows by First Home Improvements the go-to option for homeowners particularly concerned about window safety. Its design has three times more contact between the sash and the frame of an ordinary window, making it a lot stronger than most double glazing frames.

In testing, the Blade Lock was all but impregnable by ordinary means, and independent examiners couldn’t pry the windows open even using hydraulics. Put simply, neither your opportunist robber or organised criminal is getting through your window easily.

Pros and cons

Best for previewing the finished product: CR Smith Windows

Glossy photos and the power of your imagination can only go so far — sometimes you want to actually see what your home will look like with your chosen window design. CR Smith Windows makes that possible with its innovative 3D design service.

You’ll get a 3D rendering of your home with your new windows installed, so you’ll be able to actually visualise the finished product. This is a near-foolproof way to avoid buyer’s regret, because it’s a fact of life that sometimes, once something is installed, you’re just not satisfied.

CR Smith Windows even lets you explore a fully immersive virtual reality animation of your home, so you get a real sense of how it’ll all come together. And if you’re not happy with the digital preview, a consultant will be on hand to suggest alternatives.

The only significant downsides to CR Smith Windows is that it’s a Scotland-only company, and you only have the choice of either uPVC or timber windows. This basically means choosing between both the cheapest and most expensive ends of the window spectrum.

Pros and cons

Best for affordability: Britelite

If you want quality double glazing on a budget, Britelite is your best bet. Typical prices for a uPVC casement window are substantially lower than other installers on this list — £160–£450, on average, compared to £500–£1,230 for Everest.

Britelite still guarantees A+ efficiency for its windows too, which means you’re getting almost exactly the same energy-saving benefits, just at a fraction of the cost.

The company has all the expected certifications for a high-profile double glazing company as well, so you won’t need to worry about getting a botched product because you’ve spent less. That should go some way to assuage concerns that cheaper double glazing automatically means worse double glazing.

However, you’ll be limited in your material choices, as Britelite only offers uPVC, composite, and aluminium window frames. Style choices aren’t hugely varied too, with casement, sash, and tilt & turn being the only ones available.

Pros and cons

How did we choose the best double glazing companies?

Our team of four researchers spent 28 hours investigating double glazing companies to find the top seven companies across the country.

We focused on the best companies across the UK's 124 postcode areas, looking at seven key factors.

These were the customer satisfaction, warranties, finance options, window choice, security, ability to preview finished product, and affordability.

1. Customer satisfaction

We decided to not only look at a company’s average score on Trustpilot, but to take into account the number of reviews too.

There are plenty of small, local double glazing companies that scored higher than Safestyle, for example, but its high average score from 44,000+ reviews is what secured the company’s place on this list.

2. Warranty

Double glazing is a home improvement that needs a solid warranty to protect you from the unavoidable wear and tear your windows will experience.

We worked out the average warranty offered by double glazing companies, which was 10 years, and looked at which companies offered longer warranties.

3. Finance options

Not everyone wants to pay the full upfront cost for double glazing, so we compared finance options to see which companies offered the best combination of ease of repayments, quality of the product, and finance flexibility.

4. Choice

Having lots of choice when picking double glazing is important, because it’ll be a part of your home for potentially decades. We analysed companies based on available frames, materials, and whether they offered customisable window shapes.

5. Security

Double glazing naturally adds more security, but we wanted to see what companies offered an extra layer of protection for peace of mind. We looked at additional security options including complex locking mechanisms, reinforced glass and frames, and break-in guarantees.

6. Previewing finished product

It’s important to get a clear picture of what double glazing will look like after it’s been installed, so we covered companies using technology such as virtual reality to give customers a preview.

7. Affordability

For affordability, we didn’t just look at which companies had the cheapest windows overall. We considered both cost and quality, looking at the companies offering double glazing that’s great value for money.

Next steps

The number of double glazing companies in the UK is certainly overwhelming, so hopefully we’ve helped you feel more confident in picking the right company.

If you’re still unsure, we can help you compare double glazing quotes with our easy-to-understand form. Once you’ve entered a few details about your home, we’ll connect you with our trusted installers who’ll get in touch with bespoke quotes to compare.

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