The 7 Best UK Double Glazing Companies in 2023 Written by Tom Gill Updated on 31 May 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 efficiencyDouble 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. What type of double glazing do you need? Aluminium frame uPVC frame Wooden frame Other / not sure Get started What’s on this page? 01 The best double glazing companies 02 Our methodology 03 Next steps 04 FAQs 0 out of 0 backward forward Company Customer satisfaction Warranty Finance options Choice Security Previewing finished product Affordability Best for customer satisfaction Safestyle Best for warranty Clearview Best for finance options Everest Best for choice Anglian Home Improvements Best for security First Home Improvements Best for previewing finished product CR Smith Windows Best for affordability Britelite 4.1/5 (44,949 reviews) 4.3/5 (1,210 reviews) 4.3/5 (12,368 reviews) 3.9/5 (29,684 reviews) 4.4/5 (3,340 reviews) 4.9/5 (3,449 reviews) 4.1/5 (1,332 reviews) 10 years 20 years 10 years 10 years 10 years 10 years 10 years Buy now pay in 12 months 13.9% APR representative 120 monthly payments at 11.9% APR representative 120 or 180 months at 11.9% APR representative 36 months at 11.9% APR representative Enquire for loans 36 months at 2.9% APR representative 60 or 120 months at 11.9% APR representative uPVC uPVC and aluminium uPVC, timber, aluminium uPVC, timber, aluminium uPVC uPVC, timber, aluminium uPVC, composite, aluminium Multi-point locking system VAULTBOLT locking technology GrabLock technology Secured by Design accredited Blade Lock technology Secured by Design accredited Secured by Design accredited n/a n/a n/a n/a n/a 3D virtual reality scan of your home n/a £250–£1,050 per window £175–£680 £500–£1,230 £249–£999 £200–£750 £250–£895 £160–£450 Compare double glazing prices Get quotes The best double glazing companies at a glanceUnderstand the costs of adding double glazing to your property by comparing double glazing prices from various suppliers.1. Safestyle UK — best for customer satisfaction2. Everest — best for finance options3. Clearview — best for warranty4. Anglian Home Improvements — best for choice5. First Home Improvements — best for security6. CR Smith Windows — best for previewing the finished product7. Britelite — best for affordability Best for customer satisfaction: Safestyle UKSafestyle 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 Pros Excellent communication during the purchasing process Promises to beat competitor prices Removes old windows (95% of the windows they remove are also recycled) Cons Limited to uPVC windows Fined in 2018 for having pushy sales staff Best for finance options: EverestDouble 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 Pros Good security with GrabLock feature A+ energy efficiency Excellent finance options Cons Expensive compared to other companies Additional options can increase the cost quickly What type of double glazing do you need? Aluminium frame uPVC frame Wooden frame Other / not sure Get started Best for warranty: ClearviewYour 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 Pros Longest warranty period on the market Award-winning windows Lots of styles to choose from Cons Only available in Cheshire and Lancashire Best for choice: Anglian Home ImprovementsAnglian 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 Pros Huge variety of materials and styles Nationwide installer Widely accredited by FENSA, the Glass and Glazing Federation, and TrustMark Cons Some reviews mention poor communication Best for security: First Home ImprovementsDouble 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 Pros The strongest window locks on the market 12-year window and lock guarantee Cons Limited to Midlands, East Anglia, and southern England Not accredited by Secured by Design Best for previewing the finished product: CR Smith WindowsGlossy 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 Pros 3D previews of your home 98% satisfaction rate on Which? Security guarantee — any window frame broken by intruder will be replaced for free Cons Only available in Scotland Limited material choice Best for affordability: BriteliteIf 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 Pros Affordable windows Transferrable guarantees Backed by industry-recognised organisations Cons Limited material choice Only a few styles available 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 satisfactionWe 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. WarrantyDouble 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 optionsNot 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. ChoiceHaving 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. SecurityDouble 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 productIt’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. AffordabilityFor 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 stepsThe 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. FAQs Who are the best window makers in the UK? Best for customer satisfaction — Safestyle UKBest for warranty — ClearviewBest for finance options — EverestBest for choice — Anglian Home ImprovementsBest for security — First Home ImprovementsBest for knowing what the finished product will look like — CR Smith WindowsBest for affordability — Britelite What is the best material for double glazing? The best material for double glazing depends on what's most important to you. If you want a long-lasting, high-security window frame, go for uPVC because its durability is unparalleled. If you want a traditional frame that suits the aesthetics of older properties, opt for timber, which can look truly spectacular. For affordability and excellent insulation, aluminium frames are a great choice and they can last up to 30 years. When should I replace double glazing? The typical lifespan for double glazing is 15–20 years, so when your windows reach this age, it's a good idea to think about replacing them. Of course, not all double glazing is like this and you'll find some installers list a lifespan of up to 30 years.You can still keep an eye out for the tell-tale signs that your double glazing needs replacing, which include:Noticeable draughts around your windowsVisible chips or cracks along the window or frameCondensation forming between the window panesWater leaking in from the outsideDifficult opening and closing your windows How do I find the best double glazing company? When searching for a double glazing company, keep an eye out for important accreditations. These include FENSA, a government-authorised scheme that monitors building regulation compliance for replacement windows, and whether the company is a member of the Glass and Glazing Federation.TrustMark Registered Business is another one to take note of, as this means the double glazing company has been thoroughly vetted to meet high standards (excellent customer service, technical competence, and trading practices). Written by: Tom Gill Writer Tom joined The Eco Experts over a year ago and has since covered the carbon footprint of the Roman Empire, profiled the world’s largest solar farms, and investigated what a 100% renewable UK would look like. Tom has a particular interest in the global energy market and how it works, including the ongoing semiconductor shortage, the future of hydrogen, and Cornwall's growing lithium industry.