The best double glazing companies in 2025

If it's time for a new set of windows for your home, we're here to answer all your questions on double glazing work and guide you through the best window installers in the UK.
When it comes to replacing or upgrading your windows with double glazing, you have a choice of local and national operators. Make sure to gather a number of quotes to get the best price.
We have assessed a number of factors in bringing you our best buy list, including price, guarantee options, national reach and security.
We have included a price per window in the table below for most of the companies. As you can see, the range is fairly wide and depends on the window size, material, location and how many you buy.
What we can tell you is that the average three-bed house should cost about £4,500 to fit with new double-glazed uPVC windows, depending on location and window sizes.
It's important to haggle, perhaps more than many with other purchases. Windows are more of a buyers' market, since unless the panes themselves are broken, it's a purchase you can put off, at least for a little while.
This gives you the upper hand and allows some time to research the best price and options.
Depending on the installer and how tricky your installation is, you may be able to shave up to half off the initial quote you are given.
This may seem unlikely, but it's true. That's because many firms rely on Britons' general discomfort over asking for discounts to make expensive initial offers. They also rely on their competitors doing the same.
Smaller outfits that feel they need to be more competitive may not be able to drop by as much – use your judgement.
As well as this guide, it is also worth getting personal recommendations. If a company has done a good job at a fair price for a friend or colleague, they will probably do the same for you.
Best window installers at a glance
Fitter
Area covered
Founded
Guarantee
Best for
Price range
Coral Windows
Yorkshire
1990
15 years uPVC windows, 10 years locks
Payment terms, but Yorkshire only
£400 to £650 for a casement window
Britelite Windows
London, South East
1970
10 years
Good reviews, long history
From £550 a window
First Home Improvements
Most of South England
2008
12 years
Good reviews
£400 to £750
Clearview Windows
The northwest of England
2008
20 years on products
Best guarantee and plenty of awards
Not disclosed
Anglian Home Improvements
England, Scotland and Wales
1966
10 years
National coverage
£600 to £1,500
Safestyle
England, Scotland and Wales
2024
10 years
National coverage
£600 to £1,500
Everest
England, Scotland and Wales
2024
10 years
National coverage
£700 to £1,800
Best overall: Coral Windows
Coral Windows was established in 1990 by managing director John Valente, and as such, it's one of the longest continually operating firms on our list.
The family-run company covers the Yorkshire region and has its own security technology called SmartFrame, which detects intrusions and sends alerts to a smartphone app as well as triggering an alarm. It also reminds you to close windows ad doors when you leave your home.
Coral is notable for not taking a deposit on work. Founder Valente says: 'Whether we do a £4k window job or £50k conservatory or extension, we do not take one penny of deposit. The customer sees the product before they part with a penny. We are family-run, and have survived several recessions and Covid.'
These payment terms, together with the firm's reputation, means it snags our top spot in spite of its relatively small coverage.
Opting for smaller companies when buying new windows can be a good option since your business is a bigger deal for them than it would be for a national operator.
It also means showrooms may be closer – Coral has sites in Leeds, Bradford, Huddersfield, Wakefield and Sheffield.
The company sponsored West Yorkshire police cars, which helped boost business in the area. Its products have also been accredited by the force.
As for products, Coral has a range of styles including casement, sash, tile and turn and bay.
One downside is that Coral only offers uPVC windows. If you want timber or aluminium, you will have to look elsewhere.
Coral offers interest-free credit on half the value of the work for two years. You just have to pay the first half when the work is done. This is one of the better offers we have seen, although you will need to spend £9,900 or more, so it works only for big homes. The offer isn't valid for conservatories, either.
If you want to borrow the full amount with Coral, you will pay 11.9 per cent APR, which is in line with other fitters and cheaper than borrowing on your credit card, but better deals are available through personal loans, and you should probably avoid rates like this if you can.
As well as conservatories, Coral offers triple glazing with A+ energy ratings. Triple glazing is a good option for those looking to invest and really slash their energy bills. For most people, insulation and cutting draughts are probably cheaper things to do first. But some homes with good insulation will benefit from triple glazing.
Pros:
Rare interest-free credit if you spend enough
No deposit
Good reviews
Long guarantee
Cons:
Yorkshire only
Best track record: Britelite Windows
Area covered: London, Kent, Sussex, Essex and Surrey
Founded: 1970
Guarantee: 10 years
Best for: Good reviews and a long history
Another long-established firm, Britelite has more than 50 years of experience fitting windows, doors and conservatories. It covers the southeast of England.
It has Which? Trusted trader status and the company says chairman Dominic Baxter regularly reads customer reviews in order to keep service levels high.
The company's long track record and decent customer reviews helped propel it to silver in our review table.
In common with the other companies on our review list, getting a price per window is difficult, but our research suggests that each unit starts at about £550.
You will, of course, pay more for aluminium frames from Britelite. The firm also offers doors and flat roofing, as well as green roofs, a relatively recent innovation. No timber frames are on offer, but styles including casement and sliding sash are.
Green roofs, as the name suggests, offer removable panels of plants which help insulate the property, slow drainage and look nice. The removable panels mean maintenance is easier.
Britelite joins most of the other companies on this list in having regular sales, where up to 30 per cent can be saved on many products. In practice, this shows how much can be cut from most estimates and still leave a profit margin the company is comfortable with, so use this information in any negotiations you have with your fitter of choice.
The company's website is unusual in having a map of customers and reviews, so you can cast an eye over the experiences of customers who may be near to you.
In common with other vendors, finance is available, but not on great terms, being 12.9 per cent APR. Better loans are available elsewhere so long as your credit is good.
Triple glazing, conservatories, cladding and roofline products are also available. Roofline is industry jargon for guttering and the boards that seal the house under the eaves.
The cladding is uPVC material that can replace wooden boarding which was a common addition to homes once but requires regular varnishing.
Britelite has showrooms in Maidstone, Kent and Wickford, Essex.
Pros:
Long track record
Keen pricing
Cons:
South East England only
First Home Improvements has some of the broadest coverage of England and roots going back to the 1970s, although the company's current iteration was founded in 2008 through a management buyout of the previous owners.
If you are after fancier windows made of wood or aluminium, you are out of luck, but if uPVC is your material of choice, and you aren't in the areas covered by Coral or Britelite, then First could be your best choice.
There's plenty of choice within the realm of uPVC, including casement, sash, tilt and turn and even Tudor windows. First also market oval, triangle, round and arched windows.
The company offers a generous 12-year guarantee and this, together with its keen pricing, puts it third in our league of window fitters.
First offers a wide range of colours and textures, so there's no need to stick with white if you want a more contemporary look.
As well as windows, the firm will fit porches, conservatories and doors, and it has a nifty online door designer tool, which is a nice touch if you can't make it to a showroom.
As well as a generous guarantee, First will stand by its quotes for two years, which could come in handy if you need some time to save up for the job.
First joins many of its competitors in the occasional 30 per cent off sale, so it is well worth getting a quote around this time.
It also offers financing, although its website is cagey about rates, suggesting they are nothing to shout about.
Instead, consider going to a lender. If you want a loan of £7,500 to £20,000, TSB offers a rate of 5.9 per cent over one to five years, Novuna Personal Finance offers 6 per cent over the same period, and M&S Bank offers 6 per cent over one to seven years.
Borrowing £10,000 over seven years at 6 per cent will cost £2,271 in interest and mean a payment of £146 a month.
Pros:
12 year-guarantee
Good reviews
Cons:
Best for a good guarantee: Clearview Windows
Area covered: The northwest of England including North Wales, West Derbyshire and South Lakes
Founded: 2008
Guarantee: 20 years on products (roofs and PVC frames doors & glass), 10 years on aluminium and building work
Best for: A good guarantee and plenty of awards
North West-focused Clearview has a generous 20-year guarantee on many of its products, although the work itself is guaranteed for the more industry-standard 10 years.
If you are in the Nort West of England, Clearview is a good choice because of this lengthy guarantee and a respectable haul of industry awards.
The firm is proud to have won the Glass & Glazing Federation Installer of the Year award for three consecutive years.
Timber frames are again missing, with the company instead focusing on more popular uPVC and aluminium models.
The company's Extreme brand of energy efficient windows, which have a A+ rating, have frequent third-off sales that are worth seeking out.
Clearview puts a focus on design, and much of its marketing effort is on conservatories, which can be designed at its showrooms or through consultations at your home.
They range from the standard white uPVC greenhouse-style designs through to more contemporary styles which look more like an extension.
However, the firm also has a good selection of windows, including casement and flush models for uPVC and slimline aluminium frames for a modern look.
Flush casement windows, as the name suggests, sit flush to their frame, rather than overlapping it like a regular uPVC model.
Showrooms can be found in Preston, Nantwich and Warrington.
As always, financing is expensive, and either paying in cash or getting a cheaper loan is probably a better financial choice. If you are ordering a conservatory, a three-month interest-free option is available, but this does not apply to windows or doors.
Clearview's products are made at a factory in Yorkshire.
Pros:
Long guarantee
Decent reviews
Cons:
Conservatory focus
North West England focused
No pricing data
Best for national coverage: Anglian Home Improvements
Area covered: England, Scotland and Wales
Founded: 1966
Guarantee: 10 years
Best for: National coverage and range of styles
The first national company on our list and the longest-running, Anglian was founded in 1966. It's changed hands several times since then and is now owned by a private equity firm, Alchemy Partners.
It is also the biggest in the country, fitting half a million windows, doors and other products a year.
The company covers all of Britain and provides blinds and conservatories ,as well as windows, doors and porches. Anglian offers to match uPVC window prices, which means it is well worth getting a number of quotes.
This shouldn't mean that you should just get them to match the lowest quote though. If you have chosen Anglian as your window fitter, then make sure to negotiate and see if any further discounts are available.
If choice, reach and longevity were the only concerns in our review, Anglian would top the list. It offers a dizzying selection of UuPVC, aluminium and timber models, with all sorts of sizes and colours.
But it has a reputation for being expensive and cost is one of our top criteria, as well as customer satisfaction.
Anglian makes its windows at its factory in Ipswich, Suffolk, and they can be made to fit your measurements.
It also offers money off if you recycle your old windows through the firm, which might make for a further attractive discount.
Like many companies that offer home improvements, you can borrow money through Anglian to help spread the cost. But the firm's offering on this front isn't very competitive with a 12.9 per cent APR.
You would be much better off spending savings, since no savings account in the UK can beat that figure. If you don't have the savings to spare, then seeking financing through a personal loan is probably a better bet, with rates closer to half what Anglian is offering being available.
A big plus for Anglian is the sheer choice, with wooden options as well as uPVC and aluminium.
The firm will also make sash windows, as well as the usual outward-opening casement style.
Modern tilt and turn windows – the ones that will hinge at the bottom to allow a small vent at the top as well as hinging on the side – and bay windows are on offer, as is secondary glazing.
Pros:
Huge choice
National coverage
Cons:
Expensive
Mixed customer reviews
Best for recycling: Safestyle
Famous in North West England for its quirky TV adverts fronted by medieval garb-clad Jeff Brown, who offered regular buy-one-get-one-free deals to customers, and later ones featuring former England goalie David Seaman, Safestyle collapsed into administration in 2023, blaming high costs and weak demand.
It was bought by rival Anglian, but the collapse left some customers with worthless guarantees.
Its similar, but more limited, offering places it just below its owner on our list.
Under its new ownership it offers very similar services to Anglian, with a 10 year guarantee and broad coverage of the UK.
There's excellent choice, but all made in uPVC. Those who want wood frames, perhaps to adhere to local planning and conservation rules, will have to look elsewhere.
But uPVC is very low-maintenance, and Safestyle offers every design variation under the sun, including sash, bay and triple-glazed.
Safetyle will remove your old windows and recycle them. It has the same quote matching as Anglian and quotes are valid for six months.
Make sure you haggle, as with any supplier on this list. Interestingly, Safetyle sales are sometimes seen at the 15 per cent mark, rather than the 30 per cent others offer. This should not dissuade you from seeking a bigger price drop, however.
As with its owner, Anglian, you can borrow money through Safestyle to help spread the cost. But the firm's offering on this front is the same at a fairly chunky 12.9 per cent APR.
You would be much better off spending savings, since no savings account in the UK can beat that figure. If you don't have the savings to spare, then seeking financing through a personal loan is probably a better bet, with rates closer to half what Safestyle is offering being available.
Other fitters on this list offer interest-free credit or other favourable payment terms.
Pros:
Recycle your old windows
Good choice, albeit only in uPVC
Cons:
uPVC only
Mixed customer reviews
Rough recent history
Best for transparent pricing: Everest
Everest is one of the more famous names on our list, thanks to a couple of TV campaigns in the 1980s and 2000s showcasing its windows at the Tan Hill Inn, the highest pub in Britain.
But the company has had a troubled recent history, going into administration in 2020 in the wake of Covid lockdowns and then again in 2024. It is now owned by Anglian.
Its financial troubles left some customers unable to cancel orders and with worthless warranties, although purchases made just before the collapse were fulfilled by its new owners.
Everest, like Anglian, offers a huge array of options, including timber and aluminium. The website is very easy to use and doors and conservatories are also available.
The company's recent troubled past and some recent unfavourable reviews put it last for us.
Unlike its stablemates Anglian and Safestyle – and indeed unlike any other firm on this list – Everest publishes a guide on how much their windows are likely to cost.
These costs inform our table further up the page. With the other firms, we have had to use customers' estimates to provide figures.
uPVC casement windows cost £700-£1,800 a window, with sash windows costing 50 per cent more, tilt and turn models 25 per cent more, bay windows 150 per cent more, aluminium frames 25 per cent more than uPVC and timber 50 per cent more than uPVC.
These prices are the firm's asking prices and should be taken as a starting point for negotiations. Aim to lop of at least a quarter and try for a half if you can, perhaps by offering to pay upfront or add more work.
Everest says its windows are now triple glazed as standard, which will make for costlier windows – add 10 to 20 per cent – albeit ones that retain the heat better.
Everest, like its sister companies Anglian and Everest, offers financing but the rate is an uncompetitive 12.9 per cent. Using savings first will be cheaper, if you have them. Failing that, there are loans from high street lenders at half that rate.
Pros:
Unusually transparent pricing
Triple glazing as standard for uPVC
Cons:

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