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Best double glazing companies

Everest double glazing company review

By Liz Ransome-Croker

Article 4 of 5

Put us to the test

Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.

We reveal what double glazing customers think of Everest's service and products, sat alongside competitors Anglian and Safestyle, based on the results of an independent Which? survey.

Our survey of 2,152 double glazing customers reveals ratings for big-name brands Everest, Anglian and Safestyle, as well as independents, so you can find out which firm is best - and how Everest shapes up to the competition.

The results of our survey reveal vast differences between companies. Customers raved about our top-scorer, which achieved an overall customer score of 84%. While the bottom-rated double glazing brand picked up just 54% - some 30 points less.

Everest double glazing rated?

The table below shows how Everest's customers rated it for the buying and installation process.

Only logged-in Which? members can view our exclusive ratings and verdicts in the table. If you're not yet a member, join Which? now to get instant access. 

Everest customer score
Purchase Everest's star ratings
Knowledge of salesperson
Clarity of documents
Customer service
Quality of products
Durability of products
Value for money
Installation  
Organisation of installation
Installers keeping to arranged times
How well the installers communicated
Mess during and after installation
Quality of installation
After sales  
After sales support
Complaints handling

To see comparative scores with the other brands and independents, see the best double glazing companies.

Everest customer ratings and comments

We asked Everest's customers to tell us how satisfied they are with the brand and whether they would recommend it. We then use this data to calculate an overall customer score.

We also asked them to rate, from very poor to excellent, a number of aspects of the process on a seven-point scale. This includes the knowledge of staff (both sales and installers), quality of products and installation, and clarity of documentation - such as the contract. 

You can use these ratings to help you understand which elements the companies in our survey succeed on, and where they fall down.

In addition to our ratings, we asked customers to give us any comments on their experience with the company. Log in or join Which? now to reveal these comments, along with our expert verdict on:

Everest double glazing

Flick through the images below to see some examples of the types of double glazed windows and doors Everest provides, and read on below to learn more about its services.

What does Everest offer?

Areas in the UK Everest covers: England, Scotland and Wales, but not Northern Ireland.

Types of windows: casement and bay in uPVC, timber and aluminum; sash in uPVC and timer; uPVC flush; timber dual turn and uPVC tilt and turn in a range of colours, including wood-effect. 

The uPVC windows are also available in a range of colours and woodgrain effect. It offers paint or stain finishes on timber windows to highlight the grain. Its windows and doors have its GrabLock, developed with Yale.

Types of doors: aluminium bi-fold in a range of colours, aluminium and uPVC patio and French doors in timber, aluminum and composite.

It also does garage, porch and composite, timber, uPVC and aluminium front and back doors, most partially glazed.

Make sure you understand what type of windows and doors would be best for your home by visiting our guide to choosing double glazed windows and doors.

Window energy ratings: A+ rating as standard for uPVC casement windows. Triple glazing is A++. It doesn't state the energy ratings for other double glazing on its website.

Triple and secondary glazing: It offers triple glazing and secondary glazing options in addition to double glazing. It also offers acoustic glass to help to reduce noise. 

Conservatories: it sells conservatories, orangeries, replacement roofs and extensions - both glass and tiled roof. Our guide to conservatories and orangeries explains all you need to think about before buying one. 

Window and door guarantees: 10-year guarantee on all new windows. Windows and doors of different materials can have different additional guarantees, such as 30 years against rot and fungus on timber windows and doors. Some have a lifetime guarantee. These can be switched to a different owner, but at a cost.

Other services Everest offers: flat roots, roofline/rooftrim (such as guttering, bargeboards, cladding etc), driveways, artificial grass, Yale smart locks and security alarm systems.

Competent Persons Scheme: accredited by Fenestration Self-Assessment Scheme and Glass and Glazing Federation, which means Everest installers can self-certify that the double glazing is compliant with building regulations. This saves you from having to contact building control yourself.

Find out the average prices for different windows and doors, so you know what a realistic quote looks like, by visiting our double glazing prices guide.

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