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Double Glazed Windows

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Double glazing windows

Double Glazed Windows

Warmth, Security and Comfort, Guaranteed

  • Designed, manufactured & installed
  • Made-to-measure, with a range of options
  • Market-leading energy-efficiency & security
  • Built to last with long-lasting guarantees
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Double Glazed Windows From Everest

Double glazed windows are constructed from a frame and a glazed unit featuring an insulating layer of Argon gas sandwiched between two panes of glass. The primary benefit of double glazing is thermal insulation – to retain heat in a room whilst stopping cold air entering from outside to make the room more energy efficient. The deeper the unit, the more insulating the glazed unit is, Everest double glazed units have a unit depth of 28mm.


Everest double glazing is one of the highest performing glazing units on the market with industry-leading U-values making it ultra energy efficient. Choosing energy-efficient Everest windows can help lower your energy bills and reduce your carbon footprint.


We only use the best components to make superior quality windows and pay attention to all the details of our frames. Market-leading corner welds, a PCE gasket with a superior weather tight seal, an extreme multi-point locking system with powerbrace keeps for enhanced security and a trickle vent which has noticable noise reduction on previous vents.


A double glazed unit can be made with different types of glass to create windows that are specific to different needs. We offer a range of windows that includes energy efficient windows, noise reduction windows, security windows and windows with solar control glazing.


Everest double glazing is available in a wide range of options suitable for all types of houses such as modern, traditional and period properties. Choose from uPVC double glazing, wooden windows and aluminium windows. We also offer a variety of designs, including the popular casement window, Tilt and Turn, bay window and sash window.

Everest Double Glazed Window Styles

An Everest casement window

Casement Windows →

The most popular window choice. Available in uPVC, wood or aluminium, all with a range of colours and options.

Everest Tilt and Turn window

Tilt & Turn Windows →

Tilt turn windows open inwards for easy cleaning and tilt for ventilation without compromising security.

An Everest bay window

Bay Windows →

Bay windows can be crafted from uPVC, timber or aluminium double glazing to fit with the style of any property.

An Everest Sash window

Sash Windows →

The classic window for a traditional house. Available in beautifully crafted timber or low-maintenance uPVC.

Market-Leading Energy Efficiency

With the introduction of our new uPVC windows, we are offering superior energy efficiency, market-leading U-values and a drive towards sustainability that has not been widely available in the UK.


As the Future Homes Standards are introduced, the energy efficiency of a home and U-values for windows will become more important. At Everest, we believe that triple glazed windows will become a requirement in all new build houses as the standards for the fabric structure of buildings keep increasing.


Everest uPVC triple glazed windows and double glazing windows have a low U-value with triple glazing achieving a market-leading 0.80. The frame is made with recycled uPVC and most of the window can be recycled to reduce the impact on the environment.


By choosing Everest uPVC windows now, we will help you to future-proof your home with the best products for energy efficiency and the environment:

  • 0.80 U-value achieving the proposed Future Homes Standard
  • PAS 24:2022 highest security standards
  • Excellent acoustic standards with new low noise vent
  • Recycled uPVC used in frames, a more sustainable choice than virgin uPVC
  • The uPVC window can be recycled, meaning less impact on the environment

Everest Double Glazing Units

Ultimate

Low U Value

Ultimate Security

Low U Value with security

Noise Reducing

Noise Reduction

Energy Saver Plus

Energy efficiency

Energy Saver

Energy efficiency entry level

Energy Saver Security

Energy efficiency and security


Ultimate Double Glazing

Ultimate Double Glazing

The outer pane reduces solar heat gain and provides high insulation, this combined with the Low E inner pane reflects heat back into the room.


Benefits


Tick  Low U Value
Tick  Reduced solar gain
Tick  A high degree of neutrality

Download Tech Sheet

Performance

U Value (No Georgian Bars): 1.22

G Value: 0.21

Window Energy Rating: E

Glass Panes

Outer Pane: 4mm Toughened SKN176

Inner Pane: 4mm PlaniTherm One

Decorative Glazing Options

Georgian Bars: Internal or External

Obscure Glass: Not available

Leaded Glass: Not available

Ultimate Security Double Glazing

Ultimate Security Double Glazing

The outer pane reduces solar heat gain and provides high insulation, the inner panel has a security laminate for added security.


Benefits


Tick  Low U Value
Tick  Reduced solar gain
Tick  Added security laminate

Download Tech Sheet

Performance

U Value (No Georgian Bars): 1.24

G Value: 0.24

Window Energy Rating: E

Glass Panes

Outer Pane: 4mm Toughened SKN176

Inner Pane: 6.8mm Laminated

Decorative Glazing Options

Georgian Bars: Internal or External

Obscure Glass: Not available

Leaded Glass: Not available

Noise Reducing Double Glazing

Noise Reducing Double Glazing

The inner pane includes a special acoustic laminate that disrupts sound waves helping to reduce noise coming into the room. Read more about Everest noise reduction windows.


Benefits


Tick  Enhanced soundproofing
Tick  Can reduce sound up to 40 decibels
Tick  Good insulation

Download Tech Sheet

Performance

U Value (No Georgian Bars): 1.35

G Value: 0.46

Window Energy Rating: A

Glass Panes

Outer Pane: 6mm Low Iron

Inner Pane: 6.8mm Acoustic Laminated

Decorative Glazing Options

Georgian Bars: Internal or External

Obscure Glass: Optional

Leaded Glass: Optional

Energy Saver Plus Double Glazing

Energy Saver Plus Double Glazing

The outer pane increases solar heat gain while the inside pane reflects heat back into the room.


Benefits


Tick  Highly energy efficient (A+ Rated)
Tick  Neutral and clear appearance
Tick  Increased level of solar heat gain

Download Tech Sheet

Performance

U Value (No Georgian Bars): 1.32

G Value: 0.46

Window Energy Rating: A+

Glass Panes

Outer Pane: 4mm Low Iron

Inner Pane: 4mm Low E

Decorative Glazing Options

Georgian Bars: Internal or External

Obscure Glass: Optional

Leaded Glass: Optional

Energy Saver Double Glazing

Energy Saver Double Glazing

The inner pane reflects heat into the room.


Benefits


Tick  Highly energy efficient (A Rated)
Tick  Reflects heat back into the room
Tick  A good budget option

Download Tech Sheet

Performance

U Value (No Georgian Bars): 1.32

G Value: 0.45

Window Energy Rating: A

Glass Panes

Outer Pane: 4mm Clear

Inner Pane: 4mm Low E

Decorative Glazing Options

Georgian Bars: Internal only

Obscure Glass: Optional

Leaded Glass: Optional

Energy Saver Security Double Glazing

Energy Saver Security Double Glazing

The outer pane has a security laminate and the inner is Low E which reflects heat back in.


Benefits


Tick  Added security laminate
Tick  Highly energy efficient (A Rated)
Tick  Increased level of solar heat gain

Download Tech Sheet

Performance

U Value (No Georgian Bars): 1.32

G Value: 0.42

Window Energy Rating: A

Glass Panes

Outer Pane: 6.8mm Laminated

Inner Pane: 4mm Low E

Decorative Glazing Options

Georgian Bars: Internal or External

Obscure Glass: Optional

Leaded Glass: Optional

Does double glazing reduce noise?

Specialist double glazing can considerably reduce external noise and noise pollution. Noise reduction windows use acoustic glass that disrupts soundwaves and reduces the transmission of sound through the glazed unit by up to 40dB.


Everest noise reduction windows feature a double glazing unit made of a 6mm Low Iron outer pane and 6.8mm acoustic laminated inner pane and have been approved by the international Quiet Mark award programme.

Does double glazing reduce condensation?

The air contains microscopic water molecules that move closer together as they get colder. When molecules reach a cold surface they clump to form a dew point where visible drops of water appear on cold surfaces. Glass is susceptible to condensation when water droplets collect on the cold surface.


Double glazing helps to reduce condensation through insulation where the glass is not as cold as single glazed. Double glazing can’t eliminate condensation entirely, so following a combined approach of windows, ventilation and reduced moisture is the only way to completely get rid of condensation.

Everest Double Glazed Window Materials

Everest uPVC window

uPVC Windows →

Our bestselling windows are highly secure, energy-efficient and virtually maintenance free as uPVC will never rot, rust or flake. With A+ rated double glazing, you get a highly thermally efficient and secure window.

Everest timber window

Timber Windows →

Crafted to perfection from sustainable sourced hardwood or softwood and laminated for extra strength. The micro-porous paint and stain finishes help keep timber windows protected from the elements, so they look their best for years to come.

Everest aluminium window

Aluminium Windows →

Add a contemporary style to any property, with our slimmest profile and range of modern colours. The slim frame and large glass area let more light flood into your home, while aluminium is so strong and robust, it requires very little maintenance.

Windows Fully Bespoke to Your Home

With thousands of options to choose from, Everest windows are designed to meet your needs.

Everest coloured window frames

Colours

Over 20 stunning colours including woodgrain finishes on uPVC which look like real timber.


View Window Colours

Glazing on an Everest window

Glazing

Customise your windows with a choice of glass and glazing, including obscure, decorative, noise-reducing, double glazing or triple glazing.


View Glass Options

Everest window furniture

Furniture & Hardware

Our window handles and furniture are available in a choice of colours, so you can create the perfect look for your property.


View Window Furniture

‹›

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Double glazed windows gallery

Take a look at some of our double glazing window UK installations. Click an image below to open gallery.

A white uPVC casement window with Georgian bars
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uPVC casement window with noise reducing glass
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Chartwell green uPVC window
Click to enlarge
Golden Oak woodgrain uPVC window
Click to enlarge
White uPVC bay window
Click to enlarge
Timber casement windows
Click to enlarge
Black aluminium slim frame windows
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uPVC sash windows
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Gold lift hook on a sash window
Click to enlarge
Everest secondary glazing
Click to enlarge

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Windows for every home

Windows are an essential part of any home. That’s why ours are made-to-measure with all the options to help you create the perfect window for your home. Beautiful and practical, casement windows are the most popular choice and not only do they look stylish, but they are designed to keep your home warm, secure and quiet.

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uPVC casement window with Georgian bars

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Safe has never looked so stylish

These Everest uPVC casement windows are fitted with GrabLock, our strongest and most secure lock ever. GrabLock was developed exclusively with lock experts Yale, with 3 times the locking surface area of a standard, multi-point or shoot-bolt window lock so you can be reassured your home is offered the highest level of protection and making you feel safe in your home.

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uPVC casement window with GrabLock

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A clear choice of glass

Not only is there a choice of double or triple glazing, you can also choose your glass. There’s obscure glass which reduces the level of visibility through the pane, or acoustic glass which reduces sound by up to 40dB ensuring unwanted noise is kept outside. Plus, we offer a range of decorative glass including coloured, leaded and bevelled designs.

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uPVC window with noise reducing glass

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More than one colour

When it comes to choosing windows many of us automatically think of white, but for some that just won't do. At Everest, we offer a beautiful range of colours and natural woodgrain finishes. You can even add a modern twist to your windows, with dual colours, complementing both the inside and outside of your home.

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Chartwell green uPVC casement window

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The look of real wood, without the maintenance

Our uPVC windows are available in a range of woodgrain finishes, which look as good as wood but have all the low maintenance benefits of uPVC. We use a foil - a form of laminate finish, to give the colour and texture of authentic woodgrain.

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An Everest Golden Oak uPVC window

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Down to the finest detail

Our Smoothweld technology, available on uPVC casement, gives you an almost invisible corner joint. With clean, seam-free lines and no deep grooves that could harbour dirt, this option gives your home a beautiful, flawless aesthetic finish.

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An Everest flush casement window in Grey Cedar

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Beautifully flush

The sash on our flush casement windows close flush into the outer frame, so it sits in line with the face of the window, rather than standing proud. This means there’s no visible lip when looking at your window from outside, resulting in an attractive, aesthetically pleasing exterior appearance to your home and a modern look like the contemporary, slim styling of aluminium windows.

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uPVC flush casement window in Anthracite Grey Anthracite Grey uPVC flush window

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We make your windows your own

As well as making your windows to millimetre perfection, you can also choose where to place the handles. For example, at the bottom of the window rather than side mounted to make it easier to reach across a work surface. Our window handles are all made of metal to give a wonderful solid feel in the hand and they come in a range of finishes to complement your home.

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A grey uPVC casement window

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Authentic Georgian bars

Options such as Georgian bars create an authentic and stylish look for your double-glazed windows, adding character to your home – a classic choice for conservation areas. Our Georgian bars are available in a choice of colours, so they can tone perfectly with the chosen finish for your new windows.

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A white uPVC bay window

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Bay windows

Bay windows add a projection to the wall which can be stood in, adding a stylish look from the outside and providing a great place to sit and relax, whilst enjoying panoramic views of the outside. Adding the sense of space and offering more light, due to the extra panes, whilst becoming beautiful feature by proving charming character to your home.

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Chartwell green uPVC bay window with Georgian bars

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Great versatility

For ventilation that you control, not to mention easy cleaning, our uPVC tilt and turn windows are a great option. Both windows open to the side, and they can both be tilted as well, which gives you less ventilation but more security. As tilt turn windows swing inwards, it means you can clean the outer glass pane from inside your house making it much easier and safer.

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A white uPVC tilt and turn window

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Any which way you want

Here you can see what tilt and turn windows look like when side opened (right) and tilted (left) When tilted, they’re designed not to open too far – a security feature that means you can safely go out even with the windows partially open.

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uPVC tilt & turn window in tilt position uPVC tilt & turn window in turn position

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The natural choice

Wooden windows are a wonderful way to maintain the character of your home. Our timber casement windows are available in both Softwood and Hardwood, both of which are sustainably sourced and fitted with the latest A-rated double glazing.

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Wooden casement windows

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Traditional yet modern

If you opt for timber you can choose from natural stained finishes highlighting the beauty of the grain or classic paint colours, for a more contemporary finish, so you can always be sure that your windows will blend perfectly with your home, inside and out.

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A timber casement window

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Let the light shine in

Our casement windows also come in Aluminium with a wide choice of colours, giving your home a wonderful modern look and slim profile. Aluminium offers low maintenance and regular sight lines are built in as standard. The narrowness of the design still allows for the Argon filled air gap between the panes and the multi-point locking system is designed to exceed British Standards.

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Living room with black aluminium windows

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A traditional look without the traditional drawbacks

Whether your home is Edwardian, Victorian or Georgian, sash windows are the natural choice for most period properties. They can also add a lovely traditional edge to more modern properties. Available in both uPVC and timber, our advanced sash windows are made to measure, so no worries about sticking, jamming or wobbling.

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White uPVC sash window

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Flexible from top to bottom

One of the beauties of sash windows is the flexibility they deliver, allowing either the top or bottom section to be opened, or both at once. Our sash windows are operated with a smooth-running mechanism whether you choose traditional sash cords or modern spiral balance technology.

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uPVC sash window with shutters

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The best of both worlds

Our uPVC sash windows offer a traditional look and feel combined with modern practicality. They’re low maintenance and so easy to operate as well. And as our tolerance for gaps is so low, there’s none of the sticking or wobbling you get with older windows – or those from certain other suppliers.

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Gold furniture on an Everest sash window

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Your windows, but better

Secondary glazing is the perfect choice if you need or want to maintain your existing windows in place but are looking to keep out noise, draughts and the cold and enjoy extra warmth and comfort. The slightly foggy look you can see is down to the age of the original glass. The glass you essentially can’t see from this picture is our secondary glazing, and it’s even less visible from the outside.

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Everest secondary glazing

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Fit once, then forget

Up close, you can see how our secondary glazing is fitted, with the addition of a slim second window to an existing window. It is a discreet and unobtrusive method of insulating and soundproofing windows, all the while you can practically forget that the secondary glazing is even there. As with all our windows we offer extensive guarantees which means peace of mind always comes as standard.

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Secondary glazing with horizontal open

Double Glazing FAQs

  • +
    How long do double glazed windows last?

    The lifespan of your windows is dependent on the environment, the quality of the windows and the quality of the installation.


    The material and quality of the frame is important, but if your sealed double glazing unit fails then you lose all your double glazing insulation properties for the window.


    At Everest, we offer a lifetime guarantee against fog and condensation inside our units used in our windows. We consider a minimum of 20 years' lifespan from our double glazed sealed units, but 30 years' lifespan and more is what we expect (when fitted in a sheltered location).


    Read more: How long does double glazing last...

  • +
    How much does double glazing cost?

    The cost of new windows is dependent on so many factors such as style and materials. Many websites do offer lists of prices of their double glazed windows, but these are usually the cost for a basic off-the-shelf window and often without the cost of installation. At Everest, our products are made-to-measure and customised to your taste and home, which is why you won't find a price online as there are too many contributing factors.


    Read more: How much does double glazing cost...

  • +
    What window colours are available?

    At Everest we offer a beautiful range of colours and natural woodgrain finishes, so there is a perfect colour to suit every property. Colours range from the traditional white uPVC finish, through to Chartwell Green and ultra-contemporary anthracite grey or black. Add a modern twist to your windows, with dual colours, complementing the inside and outside of your home.


    Read more: Everest window colours...

  • +
    What types of glass are available for windows?

    Not all glass is the same. Glass comes in varying thicknesses, clarity levels and coatings and there are several types of glass you can choose for your windows and doors depending on the needs and problems in your home. Whether it's energy efficiency, reducing external noise or protecting furniture from UV damage we have the right glass to solve the problem.


    Read more: Glass options for windows...

A white casement window in a kitchen with white handle multi-point locks

Why Choose Everest Windows?


Energy Efficiency & Sustainability

When you choose Everest, not only do you make your home warmer and reduce your energy bills, but you also reduce your CO₂ emissions by consuming less energy to heat your home. We strive for an environmentally friendly manufacturing process and our new windows can be recycled at end of life to reduce the impact on the environment. We are committed to superior energy efficiency, market-leading U-values and a drive towards sustainability that has not been widely-available in the UK.

Quality Is in The Details

We source the best components and pay attention to the details that make the difference. Our window frames have almost invisible corner welds and superior weather tight seals. An extreme multi-point locking system for enhanced security that meets PAS 24:2022 and Secured By Design standards. And a trickle vent which has been acoustically tested to show an improvement of noise reduction from our previous vent.

Light shining through a anthracite grey casement window onto a desk with a laptop

Double Glazed Flush Windows
Case Study

uPVC Double Glazed Flush Casement Windows

4 star rating 4 out of 5 on TrustPilot

The windows look fantastic, so good in fact, that a neighbour knocked on the door to ask us which company fitted them. Mr & Mrs S, Kent

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Everest Window Reviews

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Everest Buying Guides

When replacing windows, always choose a style and material that is in keeping with the architectural style and age of your house. Read our buying guides that will help you to choose the right windows for your home.

How much does double glazing cost


How Much Does Double Glazing Cost?

Our guide to the cost of new windows to help you budget.


READ MORE

Different types of houses


Different Types of British Houses

Choose windows based on the age and architectural style of your house.


READ MORE

How to choose windows


How to Choose Windows

Everything you need to know about buying new windows for your home.


READ MORE

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  • Offer ideas and practical solutions
  • Show you samples of our products
  • Take all necessary measurements

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    Made in Britain

    Made in Britain is an initiative set up to highlight the importance of products being manufactured in Britain.

    BSI

    Certified to ISO 9001, the most recognised quality management standard from The British Standards Institute.

    Quiet Mark

    Quiet Mark encourages companies to prioritise noise reduction and find solutions.

    Secured by Design

    Secured by Design is a UK police initiative promoting products that help reduce crime.

    FENSA

    FENSA have accredited Everest's installation of replacement windows, doors and rooflights in existing dwellings.

    BFRC

    The BFRC is the premier UK authority for independently verified ratings of energy efficient windows and doors.