Everest double glazing company review

Our survey of 3,409 double glazing customers reveals ratings for brands including Everest, Anglian and Safestyle, as well as what customers think of independent double glaziers, so you can find out which firm is best - and how Everest shapes up against the competition.

Everest’s roots trace back to Waltham Abbey in the 1960s, producing aluminium secondary glazing. Today, it manufactures all of its uPVC, aluminium and timber products in its Treherbert factory in Wales.

Half of Everest’s customers said that they chose the firm because it had a good reputation, with its wide range of windows and doors being another common reason. But does it live up to customers' expectations? Keep reading to find out.

Everest double glazing ratings

The table below shows how Everest's customers rated it across 15 areas of the buying and installation process. 

These cover sales, purchase, installation, after-sales and how well the product lasted, and include staff knowledge, the quality of products and installation, clarity of documents - such as the contract - and value for money.

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. 

To compare 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, on a seven-point scale from very poor to excellent, a number of aspects of the process. We analyse the responses to produce our star ratings. 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:

• Double glazing sales and quotes - which includes tips from double glazing customers and experts on how to side-step sales tactics and find a great company
• Double glazing prices - where you'll see the average prices for various types of doors and windows.

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.

Everest double-glazed windows and doors

Areas in the UK Everest covers

England, Scotland and Wales, but not Northern Ireland.

Everest double-glazed windows

Everest sells casement and bay windows in uPVC, timber and aluminum; sash in uPVC and timber; uPVC flush windows; and uPVC tilt-and-turn windows.

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

Everest double-glazed doors

Everest sells aluminium bi-fold doors in a range of colours, aluminium and uPVC patio doors, and French doors in timber, aluminum and uPVC.

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 what to look for when buying double glazing.

Everest double glazing energy efficiency

 A+ rating as standard for uPVC casement windows. Triple glazing is A++. Its timber casement windows are A-rated, and its aluminium casement windows are B-rated (A for those with a timber sub-frame). Its uPVC and timber sliding sash windows are A-rated.

Everest triple and secondary double glazing

Everest offers triple glazing and secondary glazing options in addition to double glazing. It also offers noise reducing glass. 

Everest conservatories

It sells uPVC conservatories and replacement roofs. Our guide to conservatory prices explains all you need to think about before buying one. 

How long are Everest's window and door guarantees?

Everst has a 10-year guarantee on most parts and materials in its products, but a 20-year guarantee for its uPVC Exclusives windows and doors range. Some have a lifetime guarantee, which covers condensation and fogging between uPVC panes, but you have to pay extra for this.

Everest is 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 your local council's building control department yourself.

Other Everest home improvements 

Everest also does flat roots, roofline products (such as guttering, bargeboards, cladding etc), driveways and artificial grass.

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