Endorsed by Which?

Advanced Glazing Systems Ltd

4.9

369 Reviews

Opening Hours
Today - 08:00–17:00
  • 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
WONDERFUL FLUSH FITTED WINDOWS
Really very pleased with the quality of our flush fitting windows. The fitters arrived on time every day and took all old windows away, they were always helpful with any issues we had. Would definitely recommend Advanced Glazing Systems.
Customer in Essex Posted on 16/10/2025 (Reviewer did not use service)
The trader replied (on 26/11/2025)
Thank you for your kind review.
excellent service great product good price
Customer Service
Quality
Value
Having installed double glazing 12 years ago and to a very high standard they have just installed more windows in the property. They are very professional and quick to provided an estimate and then send a surveyor and finally install the windows. Their prices are very competitive and their products are of a very high standard. The staff are excellent and helpful and their fitters managed the work in one day and were very professsional. They are a small family business and need to be supported
Customer in Greater London Posted on 08/10/2025 , work completed 26/09/2025
The trader replied (on 26/11/2025)
Thank you for your kind review.
new back door
Customer Service
Quality
Value
I needed my back door replaced they came out gave me a quote Tyler was really quick to respond to my emails and come out. They listened to what I wanted and booked in at a time good for me. Great service great communication and great job done.
Customer in Greater London Posted on 02/10/2025 , work completed 08/09/2025
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.
Friendly, Quality Service
Customer Service
Quality
Value
AGS were recommended to us by our neighbour and we were very pleased and impressed. Very friendly service, did the job promptly, quickly and tidily. Their attention to detail and expertise were of great quality; they proved reliable, punctual, communicative and responsive throughout the process. Would definitely recommend!
Customer in Hertfordshire Posted on 17/08/2025 , work completed 01/08/2025
The trader replied (on 26/11/2025)
Thank you for your kind review.
Good work
Customer Service
Quality
Value
Replacement of all windows plus front and back doors. Work done very expertly and efficiently. Pleasant and helpful. Tidied everything up afterwards well.
Customer in Essex Posted on 12/08/2025 , work completed 30/07/2025
The trader replied (on 26/11/2025)
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.
Great work
Customer Service
Quality
Value
We were very impressed with the quick and efficient services from AGS. Everything was smooth and easy. From measuring to fitting, everything was done on time. Tyler was very friendly and helpful when we were not sure which door to choose. We highly recommend AGS if anyone is looking for new doors and windows.
Customer in Greater London Posted on 06/07/2025 , work completed 20/05/2025
The trader replied (on 26/11/2025)
Thank you for your kind review.
very happy customer
Customer Service
Quality
Value
i used AGS last year to renovate my porch and was very impressed with the team, the price and the workmanship, therefore i have just used them again to replace all the window glass throughout my bungalow. I would and have highly recommended this company to others.
Customer in Greater London Posted on 02/06/2025 , work completed 27/05/2025
The trader replied (on 26/11/2025)
Thank you for your kind review.
Lovely new front door
Customer Service
Quality
Value
AGS were super helpful from the start. We have tried 3 or 4 times in the past to get a new fire rated front door (FD 30), glazed, with no success, but AGS made it a pleasant and straightforward process. From the initial consultation, survey and fitting, they took trouble to make sure we got exactly what we wanted. Looking forward to winter now, with no draughts, and lots of light coming in, we are so pleased with the door which has transformed our flat!
Customer in Greater London Posted on 23/05/2025 , work completed 14/05/2025
The trader replied (on 26/11/2025)
Thank you for your kind review.
Patio and french doors
Customer Service
Quality
Value
As with our previous project on which AGS worked, the whole team was efficient, friendly and helpful. Highly recommended.
Customer in Greater London Posted on 04/05/2025 , work completed 09/04/2025
The trader replied (on 07/05/2025)
Thank you for your kind review
Great company
Customer Service
Quality
Value
We have used A G S several times and have received nothing but excellent service each time. The office staff were helpful and friendly, the fitters were efficient, worked to time and left the site clean and tidy.
Customer in Greater London Posted on 01/04/2025 , work completed 27/03/2025
The trader replied (on 10/04/2025)
Thank you for your kind review
Excellent service
Customer Service
Quality
Value
We received a prompt and efficient service. We had excellent communication from the AGS team throughout , with reliable delivery and fitting of good quality windows
Customer in Greater London Posted on 19/03/2025 , work completed 13/03/2025
The trader replied (on 10/04/2025)
Thank you for your kind review
New composite door
Customer Service
Quality
Value
I love my new door! My rep, Tyler, was so helpful in guiding me through the process, providing the clarification and info I needed in order to complete the spec for my bespoke door. He was endlessly patient with my to and fro calls and emails and the rest of the AGS team were equally polite, helpful and efficient. For both measurement and fitting, they came when they said they would and did what they said they would, and all so fast! I'd happily use AGS again and have recommended them to my friends. Thank you Tyler and AGS!
Customer in Greater London Posted on 21/01/2025 , work completed 02/12/2024
The trader replied (on 10/04/2025)
Thank you for your kind review
New door installations
Customer Service
Quality
Value
I reached out to 6 door manufacturers and Tyler from AGS contacted me the next day. He came and showed us exactly what we wanted with samples and pictures etc. we had other quotes but AGS beat them all. I didn’t choose them for the price but the detail of Tyler’s visit to the accuracy of the new door being centered when it was originally offset. The door has now been installed and looks better than we expected and we are glad we chose AGS. The aftercare is excellent from Simone who constantly checked if we were happy with things even to the point of payment. Well done A+ service.
Customer in Greater London Posted on 05/12/2024 , work completed 02/12/2024
The trader replied (on 10/04/2025)
Thank you for your kind review
Front room/main bedroom - new windows installed
Customer Service
Quality
Value
We were warmly recommended by various other members of our family to AGS and were more than satisfied. An old established family concern, very well run with seasoned professionals who did a perfect job( nice people as well which always helps). No hesitation in recommending them to others.
Customer in Greater London Posted on 25/11/2024 , work completed 21/11/2024
The trader replied (on 10/04/2025)
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
Fire escape window and Front door
Customer Service
Quality
Value
Have now used Advanced Glazing on a few jobs,this job was for a rented property in Upton Park and council wanted us to get bedroom window changed to a fire escape window,as expected from first call to finish I would like to give 10/10 for the professionalism from staff that took the call, the Surveyor and the fitters. I had a call from the tenants once the work was done to say how pleased they were with the work and were so surprised with the tidiness of the fitters,they left the property spotless and were so polite.Would not use anyone else as even the after sales is absolutely fantastic.
Customer in Greater London Posted on 30/10/2024 , work completed 25/10/2024
The trader replied (on 10/04/2025)
Thank you for your kind review
Excellent windows and doors supply and installation
Customer Service
Quality
Value
We had all our windows and doors replaced by AGS, and from start to finish their service was first class From the initial meeting there was no hard sell just lots of useful advice and support; - the fitting was a full weeks work, and any problems that come across was resolved effectively; - the two fitters where excellent and worked very hard and always left everything spotlessly tidy; - the aftersales has been great - any issues have been dealt with in an efficient and effective way.. Goes without saying if you are looking for new windows I would definitely recommend Andy and his team at AGS
Customer in Greater London Posted on 16/10/2024 , work completed 14/06/2024
The trader replied (on 10/04/2025)
Thank you for your kind review
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
Excellent After Sales Service
Customer Service
Quality
Value
When AGS say 10 Year Fully Comprehensive Warranty they mean it! After six years we have had a little issue with one glass unit and within two weeks a replacement was ordered and fitted!! Very efficient. Thank you AGS. Would definitely recommend.
Customer in Posted on 12/08/2024 , work completed 18/06/2018
The trader replied (on 11/09/2024)
Thank you for your kind review
Double Glazing Installation
Customer Service
Quality
Value
Replacement of all windows for my rental property, with a total of 9 windows. An extremely professional firm, an amazing install, and a pleasure to deal with from measuring to fitting. All the work was completed in only 2 days, wherein other firms were quoting much longer timelines. My property looks amazing after the instal and was left completely tidy. Will definitely use again when needed 100% and very highly recommend. Thank you AGS Team! 🙂
Customer in Thurrock Posted on 30/07/2024 , work completed 26/07/2024
The trader replied (on 11/09/2024)
Thank you for your kind review.
Surpassed our expectations
Customer Service
Quality
Value
All new doors and windows fitted. We found this company excelled in all services it provided. We had spent several weeks asking numerous questions about product design, efficiency, alternatives such as acoustics and laminate glass, size, design, seals and gaskets, trickle vents, creasing tiles, door handles and locking mechanisms. The company was very patient answering all our inquiries, was able to provide detailed information to support quality of products so that we could check for our peace of mind. Installation was very efficient and staff courteous and professional. Work carried out to agreed schedule and accommodated our own work commitments. All completed within budget and no hidden costs. What we were particularly pleased about was accommodating our special request to have our kitchen window sprayed black on the inside whilst remaining white on the outside, which is not standard and required third party involvement which the window company dealt with directly. In summary, we would highly recommend this long established family company who really go the extra mile to ensure a first class experience.
Customer in Thurrock Posted on 30/06/2024 , work completed 26/04/2024
The trader replied (on 03/07/2024)
Thank you for your kind review.
Excellent service from start to finish
Customer Service
Quality
Value
We’d been looking for a really classy looking front door for our house. The team at AGS really listened to what we wanted and showed us a number of different options while explaining the pros and cons of each type of door. They talked us through the whole process and kept us informed of all the details and when we should expect installation. The installation was excellent with the installer really taking his time to make sure that all the locking mechanisms were smooth and easy for us to use. All in all a great service and experience and we would fully recommend them to anyone thinking about using them.
Customer in Greater London Posted on 18/06/2024 , work completed 17/06/2024
The trader replied (on 24/06/2024)
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.