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5 October 2020

Double glazing companies rated

Our research reveals how well-known firms Everest, Safestyle and Anglian compare to each other and independents when rated by more than 2,000 double glazing customers.
Houses with double glazed windows 478462
Liz Ransome-Croker

We've asked thousands of double glazing customers to rate the company they used, including brands Anglian, Everest and Safestyle, as well as independent traders. 

The answers, from 2,155 double glazing customers, reveal a big difference between the customer score for top and bottom-rated companies - 84% vs just 54%.

Our results rate each company for a number of important factors, including customer service, quality of products and installation, knowledge and helpfulness of staff, and mess made during the installation.

Only logged-in Which? members can access the customer ratings in the table below. If you're not yet a Which? member, get instant access by joining Which? now.

Which double glazing company is best?

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

Our customer score is derived from asking each company's customers how satisfied they are with a company, and whether they would recommend it to a friend. Our ratings are based on a seven-point scale from very poor to excellent.

Log in or join Which? to unlock our results above, and see our analysis on which areas the companies are succeeding in, and how they're failing their customers. This will also give you access to the full reviews of Anglian, Everest and Safestyle.

In addition, it will reveal the average cost for different sizes and types of double glazed windows and doors on our double glazing prices page, so you know what you can expect to pay and won't get ripped off.

Common double glazing problems

No matter how good a company is, problems can arise. To help you avoid potential pitfalls, we asked double glazing customers what issues they came across when they got double glazing. 

Buying the double glazing

Reassuringly, only 13% of people experienced a problem of some kind when buying their double glazing. Here are the five most common:

  1. The company was slow in giving me any paper work about the purchase or product (e.g. quote, contract, product details, guarantee) 
  2. The company didn’t explain things very clearly when I bought the double glazing
  3. I don’t feel that the company sold me the best double glazing for my home
  4. I felt rushed to make a decision
  5. I didn’t get any product information 

Make sure you understand what you're being sold, that you get clear and detailed information and that you don't feel under pressure to make a purchase quickly. 

Visit our page on double glazing sales and quotes for all you need to know to make sure you get the best for your home.

Double glazing delivery

A fairly small percentage (15%) of people had an issue with the delivery of their double glazing. The most common problem was being supplied with the wrong/substitute parts, which 5% reported happening to them.

3% of people had scratched glass and 3% scratched or damaged frames. 2% found their home's fixtures or fittings were damaged by the delivery people.

Double glazing installation

More people had a headache with the installation of their windows - 23%. Here, we've listed the issues that people most commonly experienced: 

  1. The installation took longer than planned 
  2. The windows didn't fit as well as they should
  3. The installers caused damage to my home's fixtures or fittings 
  4. Glass was scratched
  5. The installers caused damage to the exterior of my property 
  6. Some fittings (e.g. screw covers) were not installed
  7. Work started later than planned
  8. Panes/parts were positioned incorrectly

If you're currently having difficulties with your double glazing company, our page on your rights when buying double glazing talks you through the steps you need to take.

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