Endorsed by Which?

Advanced Glazing Systems Ltd

4.9

369 Reviews

Opening Hours
Today -
  • Monday 08:00–17:00
  • Tuesday 08:00–17:00
  • Wednesday 08:00–17:00
  • Thursday 08:00–17:00
  • Friday 08:00–17:00
  • Saturday - Closed
  • Sunday - Closed

Why you can trust this trader

After undergoing rigorous assessment to become endorsed, every Which? Trusted Trader agrees to our Code of Conduct. This gives consumers the reassurance that they have the best possible protection and adds an extra layer of security to ensure best practices and procedures are followed. Which? fully investigates any breaches and will take any necessary action to ensure consumer protection.

Organisations and Awards

Sep 2019

About

AGS is a family run business specialising in all areas of UPVC and Aluminium Home Improvements.

We are much more than the average double glazing Company and we are confident that you will notice a real difference between AGS and our competitors.

We let our products speak for themselves and our friendly professional staff are more concerned with you receiving the best possible customer service and a high quality product that is right for your home.

AGS are registered with Fensa, The Glazing Ombudsman and the Glass and Glazing Federation, for complete peace of mind that you are dealing with a Company that has your interests at heart.

AGS supply and fit the following product range:

UPVC WINDOWS & DOORS - ENERGY RATED 'A'
ALUMINIUM WINDOWS & DOORS - ENERGY RATED 'A'
UPVC SLIDING SASH WINDOWS - ENERGY RATED 'A'
COMPOSITE DOORS
CONSERVATORIES
BIFOLD AND SLIDING DOORS

To discuss our product range and services further please feel free to contact us.

Andy Barnett

What we do

  • Double glazing

    • Double glazing installation
    • Double glazing repairs
    • Double glazing suppliers
  • Glaziers

    • Double glazing installation
    • Double glazing repair
    • Sash windows
    • Stained glass
    • Replacement window services and repairs
    • Aluminium Windows
    • Double glazed units
    • Triple Glazing
    • UPVC Windows
    • Window consultants
  • Conservatories

    • Conservatory repairs
    • Conservatory maintenance
    • Conservatory Roof replacement
    • Sun Lounge
  • Doors

    • Bi-fold doors
    • Composite doors
    • Front door
    • French doors
    • Patio doors
    • ​Aluminium doors
    • Orangeries
    • UPVC doors
  • Roofers

    • Guttering, fascias and soffits
    • Conservatory roof conversions
    • Tiled conservatory roofs
  • More Services

    • facias

Customer reviews

Why you can trust these reviews

All reviews are verified as being genuine and a true customer of this trader.

How can we be so sure?

100% of the reviews we publish have been through our stringent moderation process.

4.9
369 reviews
Customer Service
5.0
Quality
4.9
Value
4.8
Sort by
Excellent Service!
Customer Service
Quality
Value
The service from start to finish was extremely professional and each person from the company was very friendly and made us feel like a valued customer. We were after a colour that was about to be removed from manufacture and Tyler did his utmost to make sure we had the door ordered in time. The installation was quick, problem free and they even created a fascia at the top of the door that matched. The door looks amazing, and we have been getting many compliments. The windows were also replaced extremely quickly. We are very happy with the service from AGS and would highly recommend them!
Customer in Essex Posted on 05/07/2022 , work completed 07/06/2022
The trader replied (on 13/06/2023)
Thank you for your kind review
Great quality work
Customer Service
Quality
Value
We are very pleased with our new windows. We had 6 new ones. Sales and fitting both excellent. We were recommended this company from a neighbour and will happily recommend them to others.
Customer in Greater London Posted on 14/06/2024 , work completed 06/06/2024
The trader replied (on 17/06/2024)
Thank you for your kind review.
New Lantern (inc. new roof), Bifolds, Windows, Front, Porch and Side Doors
Customer Service
Quality
Value
We have now used AGS for two separate jobs; Bifold doors, lantern and a few windows were installed 3 years ago, we were then happy to use AGS again two years later to install new windows in three bays and a few other windows. The majority of windows and doors were installed with internal blinds. On both occasions, the installers worked efficiently and skilfully and tidied up after they finished. For both jobs AGS were very professional and friendly, they kept appointments and never let us down. A year or so after installation there was a small issue that AGS had to be contacted for, they attended the following day to address the problem with no fuss. I thought it best to wait a while after installation to leave this review to see how the product and AGS performed. As you can probably tell from my comments, we are very happy with both and have recommended to a few friends and colleagues.
Customer in Greater London Posted on 22/09/2023 , work completed 20/08/2020
The trader replied (on 26/09/2023)
Thank you for taking the time to leave us such a thorough review. We are glad you hear you are happy with everything. Thanks again.
Amazing service
Customer Service
Quality
Value
We had been recommended this company by our downstairs neighbours and were impressed by them. The quality of the service was outstanding from start to end. The company's director was prompt and professional with his replies, and incredibly patient to explain to us everything that we asked him. The survey and installation dates were easy to set. The installation itself was prompt and smooth. We went for aluminium windows. They have so far performed perfectly.
Customer in Greater London Posted on 02/05/2024 , work completed 29/02/2024
The trader replied (on 14/05/2024)
Thank you for your kind review.
Great windows, nicely installed
Customer Service
Quality
Value
I had aluminium windows installed by AGS and had a really great experience. From the first visit with no hard sell (which was very important to me), I got a reasonable price and they were accommodating when I changed my mind on one or two things. Their communications throughout were spot on. Their in-house installation team were friendly, efficient and experienced. There were a few anomalies with my old house which they cheerfully worked around. I am very pleased with the result and have nice, warm, sunny, draft-free rooms. I highly recommend AGS.
Customer in Greater London Posted on 02/11/2024 , work completed 24/10/2024
The trader replied (on 10/04/2025)
Thank you for your kind review
They were true to their word.
Customer Service
Quality
Value
I required 9 windows and 2 doors to be replaced. The initial visit to quote, was non pressurised, yet informative. The work was completed in a timely manner, and the finished product was very good, and at the agreed price. The installation over 2 days entailed concern to minimise the effects on myself, and ensuring things were cleared and cleaned prior to departure. Post installation, their maintenance booklet is very useful.
Customer in Posted on 28/07/2023 , work completed 27/07/2023
The trader replied (on 26/09/2023)
Thank you for taking the time to leave us a review, we are so pleased that you are happy with the service that you received. Thanks again.
Large window
Customer Service
Quality
Value
We wanted to replace a pair of patio doors in a first floor bedroom that opened to a sheer drop (odd, I know) with a very large feature window. The window benefits from a lovely view, which we wanted to maximise, so we wanted the narrowest frame possible. The house is old, and the window isn’t easy to access externally. Overall, this wasn’t an easy ask but Andy took time to understand what we wanted. Initially, Andy wasn’t sure that it would be possible to deliver a very thin frame given the size of the window and the need to ensure it was fitted securely. Nonetheless, he took away the challenge, researched some options and found a solution that would deliver what we wanted. The window would have to be fitted from the exterior. Communication was clear and timely throughout the process for understanding the ask and completing the work. There was a mishap when the first window cracked during transit (not the fault of AGS). AGS were on the front foot to expedite a replacement and agree a revised schedule for fitting that worked for us. We came back from holiday with some degree of trepidation given the logistics of getting the window into place to be fitted from a scaffold on the outside of the house - to find the window fitted perfectly. It was fitted without drama and is exactly what we wanted. This was a great example of excellent customer service at every step of the way, as well as excellent execution of the job. Thank you and well done Andy and team.
Customer in Greater London Posted on 30/08/2024 , work completed 19/08/2024
The trader replied (on 11/09/2024)
Thank you for your kind review
Great company
Customer Service
Quality
Value
We have been very happy with our experience with AGS. Everyone from Tyler, the surveyor and the fitters were all friendly, professional and did a great job. We’re really happy with our new windows and are looking forward to them doing the rest when we do our extension. They are also very competitively priced too. Highly recommend.
Customer in Essex Posted on 17/07/2025 , work completed 23/06/2025
The trader replied (on 26/11/2025)
Thank you for your kind review.
Total satisfaction
Customer Service
Quality
Value
We are so happy with our new French doors. We can't fault anything from the initial quote to the installation. Support from the office was also great. Would definitely use again Thank you!
Customer in Essex Posted on 03/09/2025 , work completed 05/08/2025
The trader replied (on 26/11/2025)
Thank you for your kind review.
My Review
Customer Service
Quality
Value
Excellent.
Vicki, London Posted on 06/11/2014 , work completed 06/11/2014