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
Renewal of double glazing
Customer Service
Quality
Value
AGS have just renewed all our windows and doors apart from the front door which we’d had done a couple of years ago. We would definitely recommend AGS. Andy’s quote was straightforward with no messing about and didn’t take hours like some companies. Once we’d accepted the quote the surveyor came to measure up, everything was ordered and we very quickly had an installation date. The installation team arrived early on the planned day and worked hard. The job was finished in three days as promised at the beginning even though three panes of glass had broken at the depot - these were ordered and arrived in time to be installed without the job being delayed. The team were friendly, worked hard and cleared up very well each day. We were impressed with the attention to detail given to the job.
Sally in Greater London Posted on 20/04/2022 , work completed 13/04/2022
The trader replied (on 13/06/2023)
Thank you for your kind review
Efficient, tidy, great quality and excellent service from start to finish.
Customer Service
Quality
Value
Once Andy and Tyler walked through the front door I sensed professionalism. My wife and I talked through what we would like installed, being 5 windows and a new front door, all in uPVC and the windows being sash. Andy explained everything from the window design, a sample, to how best the installation could be done, clarifying with his surveyor on the phone whilst with us. The date for install was set and met and the installation completed in 2 days. The work was brilliant, the mess, non existent. The guys cleaned up as if they'd never been here. Brilliant company and highly recommended
Customer in Essex Posted on 17/09/2022 , work completed 02/08/2022
The trader replied (on 13/06/2023)
Thank you for your kind review
Quality Service from a Professional Family Business
Customer Service
Quality
Value
The replacement UPVC double glazing units for the front and back of our house totalled 11 units, including porch doors, flat and bay windows, and a back door. The work was completed in 5 days by Carl and Jordan, who work well together, and were professional in ensuring a quality job with the minimum of intrusion. They responded rapidly to an unforeseen problem when taking out one of the old windows. From the commencement of our enquiry to the company, we found the responses from Andy Barnett to be concise and prompt, and in the administration department, Ella was knowledgeable and friendly. A well-run and efficient family business, who put service and quality (at a reasonable price) first, and they are worthy of being a Which Trusted Trader. Thank you and well done. We are pleased to recommend Advanced Glazing Systems.
Customer in Greater London Posted on 28/09/2023 , work completed 15/09/2023
The trader replied (on 02/10/2023)
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
Fantastic Company & Fantastic Products!!!
Customer Service
Quality
Value
Dealing with AGS is a dream! They are friendly, polite & efficient in every aspect. The quality of the service is matched at least by the high quality of the work they do & of the products that they have installed for us. We are 100% satisfied with all of our new Doors, Windows & Porch! Thank You AGS!!!
Customer in Greater London Posted on 13/06/2023 , work completed 08/04/2023
The trader replied (on 13/06/2023)
Thank you for your kind review
One word describes my dealings with AGS, EXCELLENT
Customer Service
Quality
Value
First contact: Phones are answered promptly by polite, efficient, knowledgable members of staff. I found their prices very competitive. The products are good quality. The surveyor and fitter did an excellent job, making good all areas and even vacuuming up the small amount of mess, 1st class.
Customer in Greater London Posted on 11/12/2023 , work completed 08/12/2023
The trader replied (on 14/12/2023)
Thank you for your kind review.
Great work and fast
Customer Service
Quality
Value
Great service from start of process to completion. Communication throughout was good,and the fitters did a first class job
Customer in Greater London Posted on 13/04/2023 , work completed 28/03/2023
The trader replied (on 13/06/2023)
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.
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
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
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.
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.
Professional and efficient
Customer Service
Quality
Value
Very professional from the first meeting delivered all responses. Work and schedules on time and to a high standard. Would not hesitate to recommend.
Dena, Essex Posted on 05/03/2015 , work completed 05/03/2015
Which? Local Review
Customer Service
Quality
Value
Small family company, no hassle sales pitch, sensible, honest, good workmanship. Took nightmare out of looking for double glazing company.
Which? Trusted Traders Consumer Posted on 04/08/2009 , work completed 04/08/2009
100% satisfaction on all aspects.
Customer Service
Quality
Value
On 04/02/10, we had the windows and door replaced by AGS and were very impressed by the professional way our order was taken with help, then the very high quality of materials and fittings. On 30/09/15 we chose AGS again to fit windows and door to a new extension on rear with same full satisfaction.
William, Kent Posted on 30/09/2015 , work completed 30/09/2015
Excellent job, happy with work.
Customer Service
Quality
Value
Very happy with work that was done, replacing three windows and fitting new porch door. Tradesmen professional, tidy and courteous. Very happy with company.
Catherine, London Posted on 04/11/2015 , work completed 04/11/2015
Excellent job
Customer Service
Quality
Value
Very punctual, work carried out to an excellent standard. First class service from the start.
Valerie, Essex Posted on 30/11/2015 , work completed 30/11/2015
Super from start to finish!
Customer Service
Quality
Value
Great customer service from initial consultation through to installation. Delighted with product and manner in which it was installed. No mess, no fuss!
Joanne, Essex Posted on 08/02/2016 , work completed 08/02/2016
Brilliant job
Customer Service
Quality
Value
The boys were very professional and friendly. Well done.
Which? Trusted Traders Consumer Posted on 11/02/2016 , work completed 11/02/2016
My Review
Customer Service
Quality
Value
Excellent.
Mark, Essex Posted on 25/09/2015 , work completed 25/09/2015
Excellent service
Customer Service
Quality
Value
AGS Were very reliable, professional & competitive.
Darren, Essex Posted on 21/07/2015 , work completed 21/07/2015
Prompt & professional
Customer Service
Quality
Value
The fitters arrived early each morning & work was carried out to a good standard. Andy kept in touch the whole time & sorted out any problems
Debbie, Essex Posted on 16/11/2015 , work completed 16/11/2015
Very satisfied
Customer Service
Quality
Value
Satisfied with workmen, very efficient. Removed door and frame. Replaced with new, cleaned up after the job, refreshing.
Cyril, London Posted on 22/01/2016 , work completed 22/01/2016
Brilliant, punctual & professional
Customer Service
Quality
Value
Excellent service. Punctual!! No hidden costs!
Harshit, Hertfordshire Posted on 11/04/2016 , work completed 11/04/2016
Great service and quality work
Customer Service
Quality
Value
Great customer service from start to finish. Can tell it's family run business. Cost was fair and both product and install were highest quality
Adrian, Bedfordshire Posted on 31/03/2016 , work completed 31/03/2016