Best UK Double Glazing Companies 2026

The Best Double Glazing Companies

While some companies are better than others, your choice should depend on which company offers the most value to you. It’s important to get and compare direct quotes to see what each company offers in your area for your specific home before you decide.

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Everest

TrustPilot Score	4.4/5 based on 12,840+ reviews https://uk.trustpilot.com/review/www.everest.co.uk
Foundation Year	1965
Additional Products and Services	Doors, Conservatories, Roofline, Driveways, Artificial Grass, Garage Doors
Website	https://www.everest.co.uk/

Everest is the second largest double glazing installer in the UK with over 3% of the total market share. The company is one of the only UK double glazing installers to control every step of their production process, from manufacturing to retail and installation. They are also the only company that maintains an in-house product development team, design team, installation team, and sales team rather than contracting out labour. This gives Everest much more control over the total quality of their products, enabling the company to offer a premium experience. This is typically reflected in the price, which can be significantly higher than some other brands.

Double Glazing Range – Everest maintains the largest range of double glazing windows in the UK. Their store includes a range of customisable windows, which you can choose based on individual features, for a total of over 700,000 different combinations. These include uPVC, timber, and aluminium frames in casement, sash, dual-turn, and tilt & turn styles. Their product selection includes:

• 30 opening styles
• 3 types of glazing
• 25 colour options
• 7 types of glass with multiple variations on decorative glass

Guarantee – Everest offers the most comprehensive warranty in the industry. In addition to the standard 10-year guarantee on all windows, Everest offers:

• Lifetime guarantee against uPVC discolouration
• Lifetime guarantee against fog and condensation on uPVC and aluminium windows
• 30-year rot and fungus guarantee on wood windows
• 25-year finish and profile discoloration guarantee on aluminium windows

Quality – Everest designs, manufactures, and instals all their own windows to a very high quality standard – as you might expect from one of the best double glazing brands in the UK. While more expensive than some of their competitors, Everest offers leading products in terms of security, energy efficiency, and construction.

Location: HQ in Cuffley, Hertfordshire. Manufacturing plants are located in Kent, Sittingbourne, and Treherbert, Wales.

Area: Most of Great Britain including Scotland, Wales, East Anglia, London, Midlands, North East England, North West England, South England, South West England and Yorkshire.

Everest’s latest window products:

Material	Style	Energy Rating	Warranty
UPVC window	Casement	A++ and A+ options	10 years
UPVC window	Sliding sash	A	10 years
UPVC window	Tilt and turn	A++ and A+ options	10 years
Timber window	Casement	A	10 years
Aluminium window	Casement	A and B options	10 years

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Anglian

TrustPilot Score	3.9/5 based on 31,706+ reviews https://uk.trustpilot.com/review/www.anglianhome.co.uk
Foundation Year	1966
Additional Products and Services	Doors, Porches, Garage Doors, Conservatories, Roof Trim
Website	https://www.anglianhome.co.uk/

Anglian is one of the largest window installation companies in the UK, with almost 60 years of experience and more than 31,000 reviews in Trustpilot. Anglian holds accreditations such as Made in Britain and Secured by Design, and they are active members in trade associations like FENSA and TrustMark. 

Double Glazing Range – Anglian offers casement, cottage, bay, sash, and tilt & turn windows in wood, uPVC, or aluminium. Windows typically feature an A to AAA+ energy rating with double or triple glazing available, as well as secondary glazing. Anglian also offers a wide variety of glass options, including designer collections like Laura Ashley, giving you a broad product selection to choose from.

Guarantee – Anglian offers a 10-year guarantee on all parts and labour for windows, plus a 15-year guarantee on gas sealed units.

Quality – Anglian offers very high quality doors and windows, and they manage the entire manufacturing and sales process. Their Made in Britain guarantee ensures that all products are produced ethically, ensures that jobs benefit the local economy, and ensures more quality control than international manufacturing. Anglian is the only double glazing installer in the UK to offer 14 Energy Savings Trust endorsed windows.

Location: Norwich (Head Office)

Area: Most of the United Kingdom, except for Ireland. Their service area includes Scotland, North East, North West, Yorkshire and the Humber, London, South West, South East, East, Midlands and Wales.

Anglian’s latest window products:

Material	Style	Energy Rating	Frame Warranty	Glass Warranty
uPVC	casement	A+	10 years	15 years
uPVC	sash	B	10 years	15 years
Timber	casement	A	10 years	15 years
Timber	sash	B	10 years	15 years
Aluminium	casement	B	10 years	15 years

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First Home Improvements

TrustPilot Score	4.5/5 based on 4,362+ reviews https://uk.trustpilot.com/review/firsthomeimprovements.co.uk
Foundation Year	1971
Additional Products and Services	Doors, Porches, Conservatories, Orangeries, Roofline
Website	https://www.firsthomeimprovements.co.uk/

First Home Improvements was founded as Debbage & Tubby in 1971. The company was restructured in 2008: Debbage & Tubby focused on manufacturing while First Home Improvement was created as a new business unit dedicated to sales and marketing. 

You can order windows from First Home Improvements with a £100 deposit and they offer interest-free financing options.

Double Glazing Range – First Home Improvements offers a wide selection of double-glazed window types:

• UPVC windows: casement, sash, tilt-and-turn, cottage and shaped windows
• Bow and bay windows
• Georgian bar windows
• Tudor windows

Double-glazed windows from First Home Improvements have an A+ energy efficiency rating. They are available in solid colours and with wood grain finishes.

Guarantee – First Home Improvements offer a 12-year warranty for their entire selection of windows.

Quality – UPVC windows from First Home Improvements are compliant with the BS7950 standard and tested for more than 30,000 opening cycles. They are corrosion resistant and designed to withstand harsh weather conditions. Although their warranty coverage is 12 years, these windows are designed for 42 years of use.

Location: Lenwade (Head Office)

Service Area: Their showrooms are located in Bournemouth, Braintree, Bury St Edmunds, Coventry, Diss, King’s Lynn, Leicester, Lenwade, Margate, Milton Keynes,  Newhaven, Norwich, Newbury, Portsmouth, Rayleigh, Southampton, St Neots and Surbiton.

First Home Improvement latest window products:

Material	Style	Energy Rating	Warranty
UPVC	Casement	A+	12 years
UPVC	Sash windows	A+	12 years
UPVC	Tilt and turn	A+	12 years
UPVC	Bow	A+	12 years
UPVC	Bay	A+	12 years

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CR Smith

TrustPilot Score	4.8/5 based on 3,959+ reviews https://uk.trustpilot.com/review/crsmith.co.uk
Foundation Year	1917
Additional Products and Services	Doors, Conservatories, Orangeries, Sunrooms, Open Plan Extensions, Repairs
Website	https://www.crsmith.co.uk/

CR Smith is a Scottish home improvement company with more than 100 years of experience and over 350 employees. CR Smith have their own manufacturing plant, which has been recently expanded with investments of over £3 million. They make their own UPVC window brand, called Lorimer.

CR Smith offers multiple financing options, which include 4-year loans at 0% interest rate and 3.9% APR loans with zero payments for 12 months.

Double Glazing Range – The Lorimer windows manufactured by CR Smith are available in four different types:

• Casement, side-hinge and top-hinge variations
• Sliding sash
• Tilt and turn
• Reversible

All Lorimer windows have an energy efficiency rating of A, which exceeds the requirements of Scottish building regulations. Lorimer windows are made of UPVC with timber sills, and there are multiple design options:

• Colours: american light oak, anthracite grey, white and rosewood.
• Handles: bright chrome, graphite, white, bright gold and black.
• Decorative glass finishes: stained, sandblasted, bevelled and leaded.

Guarantee – Lorimer windows are covered by a 10-year product and installation guarantee, which can be transferred to another owner in case you sell your home.

Quality – All Lorimer windows are made-to-measure, making sure they fit properly on your walls. They meet the energy efficiency requirements of Scottish building regulations.

CR Smith designed the Lorimer windows to mimic the appearance of traditional timber windows. They are made of UPVC, but their sills are made of real timber.

Location: Dunfermline (Head Office)

Service Area: Offices in Glasgow, Inverness, Aberdeen and Cowdenbeath.

CR Smith latest window products:

Material	Style	Energy Rating	Warranty
UPVC window, Timber sill	Casement	A	10 years
UPVC window, Timber sill	Sliding sash	A	10 years
UPVC window, Timber sill	Tilt and turn	A	10 years
UPVC window, Timber sill	Reversible	A	10 years

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Evander

TrustPilot Score	4.6/5 based on 3,615+ reviews https://uk.trustpilot.com/review/evander.com
Foundation Year	1973
Additional Products and Services	Doors, Conservatories, Insurance Claims, Locksmith Services, Property Management, Noise Insulation
Website	https://www.evander.com/

Evander offers a wide range of services for homeowners, commercial properties and insurance companies. They specialise in glazing and locksmith services, and they work with over 120,000 residential and commercial properties each year. Since 2016, Evander has been owned by VPS Group, a leading provider of property security services.

Double Glazing Range – Evander provides a wide range of customisable windows with UPVC, timber or aluminium frames. They offer both double and triple glazing, and their windows are approved by insurance companies. 

• Evander offers multiple colours and finishes, regardless of the frame material you choose.
• UPVC windows can be ordered with wood grain effect, to mimic the appearance of timber windows.

Evander offers windows with B-rated energy efficiency as their standard option, but you can request an upgrade to A-rated glazing.

Guarantee – Evander offers a 10-year guarantee for UPVC and aluminium windows, and a 5-year guarantee for timber windows. Evander also offers a 1-year repairs and workmanship warranty for all home improvement services.

Quality – All the windows installed by Evander are approved by the insurance industry, and they have experience working with the top 20 insurers in the UK. Evander has a dedicated manufacturing plant, and your windows can be customised to fit openings of different sizes.

Location: Norwich (Head Office)

Service Area: All locations in the United Kingdom.

Evander latest window products:

Material	Style	Energy Rating	Warranty
UPVC window	Casement	A or B	10 years
UPVC window, Aluminium frame	Casement	A or B	10 years
UPVC window, Timber frame	Casement	A or B	5 years

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Comparing the Top Double Glazing Companies

Company	Everest	Anglian	First Home Improvements	CR Smith	Evander
Guarantee	10 years	10 years	12 years	10 years	5 years timber 10 years UPVC and aluminium
TrustPilot Rating	4.4/5	3.9/5	4.5/5	4.8/5	4.6/5
Finance	9.9% APR 36-180 months	12.9% APR 36 months	Varies by lender 0% options available	3.9% APR with 2-5 year term or 0% APR with 4-year term	Not specified on website
Materials	Timber Aluminium UPVC	Timber Aluminium UPVC	UPVC	UPVC with timber sills	Timber Aluminium UPVC

Top Window Manufacturers

There are also companies that only manufacture the windows, which means you must look for your own installer. You can either buy directly or ask your installer to buy the windows from these companies and then install them. Some of these companies have a recommended installer database that you can peruse.

Double glazing company	Number of windows endorsed by The Energy Saving Trust	Number of windows endorsed by the SBD
A&B Glass	6	3
CMS Window Systems	7	15
Direct Windows Company	1	2
Duraflex	8	1
Masterframe Window	10	2
Tradesmith Ltd.	10	2

 In some cases, choosing your double glazing installer will come down to which company offers the lowest price.

Everest focuses on premium windows with higher prices. This makes them a good option if you are more concerned about quality, longevity and warranty coverage.

Anglian is characterised by their broad product selection, offering both affordable and premium window options.

Why Choose a Big Company?

While small double glazing companies can sometimes offer a better price, it’s often in your best interest to choose a larger company anyway. Why? Larger companies can afford better warranties and guarantees, and many of them are insurance backed. This means that even if your installer goes out of business, your guarantee will still be honoured.

Larger companies can also afford faster installation, offer better sales and discounts, and can install in more areas. If price is your absolute biggest priority, you should compare quotes and try to find the lowest-priced installer with a quality guarantee.

Top Window Manufacturers Only

There are also companies that only manufacture the windows. For the installation, you have to contact one yourself. You can either buy direct or ask your installer to buy the windows from these companies and then install them. Some of these companies have a recommended installer database that you can peruse.

Double glazing company	Number of windows endorsed by The Energy Saving Trust	Number of windows endorsed by the SBD
A and B Glass	6	3
CMS Window Systems	7	15
Direct Windows Company	1	2
Duraflex	8	1
Masterframe Window	10	2
Tradesmith Ltd.	10	2

In some cases, choosing your double glazing installer will come down to which company offers the lowest price. In this case, companies like Anglian and Safestyle will typically stand out. However, if you are concerned about quality, longevity, warranty, or having more options, Anglian will stand out as well.

Which Type of Window is Best For You?

When picking the best double glazed windows for your home, you have to consider four important factors.

• The style to choose
• When it comes to the style of the windows, there are four options to choose from: the Sash, Cottage, Bay, Tilt & Turn, Dual Turn, and Casement. These are the most popular styles.
• The style of your property will determine the best type of windows for your house.
• When it comes to the actual replacing of the windows, it is always best to match the new windows to the ones you are replacing. Also, be sure to check out the predominant style on your street in order to properly fit in with the aesthetic of the neighbourhood.
• The most popular of the bunch are casement style double glazing windows. The installer will usually quote this as standard is you haven’t specified any preference.

Type of Windows	Features	Cost
Sash	The word “sash” refers to a single frame for glazing Traditional “sliding sash” windows are usually made up of two sashes that slide up and down They are a typical feature of traditional English Georgian and Victorian properties Sash windows are usually handcrafted in original timber	The cheapest option for sash windows is uPVC. Timber can cost as much as 40% more for the windows alone. The age of the property and whether it is located in a conservation area are ultimately what sets the costs of replacing sash windows. Aside from the material costs, there’s also labour costs to take into consideration.
Cottage	Also known as Georgian and Tudor windows, cottage style windows are usually reserved for older homes. Modern versions of cottage windows are available in a wide variety of materials which include the ff.: aluminium, uPVC, and timber. Cottage windows feature horizontal and vertical strips. They are also low maintenance and help conserve energy.	The cheapest materials are uPVC frames but using them can reduce the value of period cottages. For those who are on a budget but wants timber, softwood is a popular option. Hardwoods are more durable. stable, and also offers a longer lifespan. However, they are also up to four times more expensive than softwood.
Bay	Bay windows are those that project out from the main walls of the house and forms a bay within the room. A hugely popular feature of Victorian homes, this type of windows can now be found on almost any type of home. Bay windows increase the flow of natural light from outside, thereby making the room appear larger. Bay windows have four types: Box, Bow, Circle Bay, and Oriel.	The number and type of windows and its properties, the configuration of the frames, the size, and the security options all determine the cost of replacing or installing new bay windows. For example, a bow window will cost more because it needs more glass and it covers more space. The roof of the bay window is another matter to consider, whether it is pitched or flat. Labour costs also need to be considered.
Tilt & Turn	Unlike most standard windows, tilt and turn windows open inwards. This makes them safer, allows more ventilation, and makes upkeep easier. Due to their security features and excellent weatherproofing, tilt and turn windows have long been the standard on the continent. You can choose between tilting the window inwards slightly or turn it fully and have it wide open. This is very easy to open and close since the window opens inwards and not outwards.	More expensive than casement windows of the same material are uPVC tilt and turn windows. This is because tilt and turn windows have a more complicated operating system and locking mechanism. When picking this style, you also have to take into consideration the labour costs.
Dual Turn	The modern alternative to casement or sash windows without compromising on the performance or appearance. Dual turn windows have the aesthetics of the iconic sash window but it also functions like the modern tilt and turn windows that provide longevity and thermal and security performance. You can easily clean these windows from inside the house because of how they are constructed – both sashes can fully rotate. This feature also means that you can use these windows as emergency exits. When considering dual turn windows, you also have to mind the materials to be used, glazing, colour, noise proofing, and also security and fittings. To enhance the design of the window, you can also add bar patterns.	Using timber would markedly increase the costs of replacing or installing dual turn windows. You can pick softwood if you are on a budget but you want timber. If, however, you have no budgetary constraints, you can opt for hardwood. Hardwood is more expensive than softwood although it is more durable and stable.
Casement	Known for their practicality, casement windows can be made to fit almost any height and width. Attached to a frame by one or more hinges, they are a highly versatile type of windows. Casement windows are available in a wide array of finishes and materials. They also offer excellent insulation and security. Since all casement windows are fully sealed, they are capable of reducing heat loss and improving the energy efficiency of any home. There are some casement windows that have leaded glass patterns, which is a great way to add character to your home.	Like all the other window styles, costs vary depending on the materials used. Plain white frames are the most affordable but also the most blase. The next tier, wood effect uPVC frames, costs around 15-20% more while aluminium frames cost 30-50% more. The most expensive, timber framed casement windows, fetch around 30-50% more than aluminium windows. This still depends on the nature of the wood.

The material to choose

The most popular material for double glazing is uPVC. Timber/wood frames are also a good option since they are the most stylish and the best looking, perfect for more traditional homes. Aluminium frames are also available, they are modern looking and can be had in multiple colours.

Material	Advantages	Disadvantages	Notes
uPVC	Low cost Low maintenance Recyclable Durable Lightweight	Frames are usually white Can get dirty quickly Not the most visually appealing Non-organic	Unless your property needs to have a specific look, uPVC is probably the best option.
Wood	Made from natural materials Natural appearance Renewable material Good insulator	More expensive High maintenance Less durable Needs frequent painting Can swell	Wood is only sensible if you need wooden frames to fit with the design of your house or if you live in a listed building.
Aluminium	Weather resistant Lightweight Durable Modern looking Have multiple colors available	More expensive Less common Risk of corrosion Insulation issues	Aluminium is not yet commonly used on residential properties. Large commercial type properties are the current main users.

The product to choose

• The security and energy efficiency of your new windows should be the main considerations.
• The British Fenestration Rating Council gives an energy efficient rating to new windows and doors. The ratings range from A+ (the most energy efficient) to G (the least efficient). When choosing windows, go for those with the highest rating. You’ll get your money’s worth on them and more in the long run.
• Another thing to consider is the security of your new windows. See to it that they meet or exceed the British Security Standard and that they are securely beaded to prevent removal of the glass from outside.

If you’re ready to install double glazing in your home, use our free tool to find and compare quotes from the top installers in your area. We’ll request quotes for you, so that you can save up to 37% and get a better idea of which companies offer the most for your money. It’s completely free and there’s no obligation.