Double Glazed Windows

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

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

Casement Windows →

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

Tilt & Turn Windows →

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

Bay Windows →

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

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


Low U Value

Noise Reducing

Noise Reduction

Energy Saver Plus

Energy efficiency

Energy Saver

Energy efficiency entry level

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.


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

Download Tech Sheet


U Value (No Georgian Bars): 1.20

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

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.


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

Download Tech Sheet


U Value (No Georgian Bars): 1.36

G Value: 0.43

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.


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

Download Tech Sheet


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.


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

Download Tech Sheet


U Value (No Georgian Bars): 1.30

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

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

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.

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.

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


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

View Window Colours

Glazing on an Everest window


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

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

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


Everest Window Reviews

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.


Different types of houses

Different Types of British Houses

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


How to choose windows

How to Choose Windows

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


Start Your Project Today...

Book your free quotation appointment with one of our local expert consultants who will:

  • Provide an accurate, no-obligation quote
  • Offer ideas and practical solutions
  • Show you samples of our products
  • Take all necessary measurements

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