Mary Magee
Via Trusted Trader
Rated 4.87 / 5
805 Reviews
Rated 9.92 / 10
672 Reviews
Rated 4.9 / 5
357 Reviews
Rated 4.9 / 5
68 Reviews
Rated 4.87 / 5
805 Reviews
Rated 9.92 / 10
672 Reviews
Rated 4.9 / 5
357 Reviews
Rated 4.9 / 5
68 Reviews
A Family-Run Glazing Company You Can Trust
Advanced Glazing Systems was founded in 2004 by our chairman, John Barnett, alongside his wife, Julie Barnett, and their son, Andrew Barnett. Since then, the company has focused on providing Essex and London with high-specification windows, doors, and conservatories at affordable prices.
Our core values of honesty, quality, and trust have led us to achieving a 100% customer satisfaction score on a recent TrustATrader Installation Survey. The confidence we have in our work is backed by a comprehensive 10-Year guarantee, reflecting our commitment to exceptional service and long-lasting home improvement products.
Learn more
Whether you want to meet the faces behind our installations, book a visit to our showroom, browse product brochures, or find answers to common questions, our knowledge hub is here to help.
Why Choose Advanced Glazing Systems
Trusted by homeowners across Essex and London since 2004, we offer expert installations, honest pricing, and premium products designed to last. We’re proud to be a family-run business offering genuine advice, high-quality craftsmanship, and exceptional customer service from quote to completion.
Family Run Business
10 Year Guarantee
Free Insurance Backed Guarantee
Backed by The GGF
Accredited Levels of Security
As a family-run company founded in 2004, Advanced Glazing Systems benefits from years of first-class industry experience dating back before the company was established. John Barnett, his wife Julie, and son Andrew bring extensive knowledge and dedication to every project, whether installing UPVC, aluminium, or composite products.
We offer a wide selection of high-specification windows, doors, and conservatories, designed to meet various customer needs and budgets. Our products, including casement windows and sash windows, are tailored to improve both aesthetics and functionality, bringing lasting value to your home.
We believe in offering the best of both worlds – premium quality without the high cost. Our approach ensures that Essex and London homeowners can access top-tier double glazing, new windows, extensions, and doors at competitive prices.
Our recent 100% customer satisfaction score in a TrustATrader Installation Survey highlights our installers' commitment to excellent service. Our friendly team works hard to ensure every client is fully satisfied with the results of their home improvement projects, whether it's reducing noise pollution or improving heat retention.
Our 10-year guarantee reflects our confidence in the durability and performance of our products. We back our work with the assurance that you’ll enjoy lasting results, peace of mind, and first class service long after your installation is complete, with no hassle.
Read Customer Reviews
See why homeowners trust Advanced Glazing Systems. Don’t just take it from us, discover real experiences from our happy customers!
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.
Great service from Start to finish. After looking around for a while I made the great decision and chose AGS. From the start Tyler was...
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Sam Gleeson
Via Google
We received a prompt and efficient service. We had excellent communication from the AGS team throughout , with reliable delivery and fitting of good quality...
Read more
Customer in Greater London
Via Which?
Brilliant Company. Andy’s communication and response to any queries was excellent. Quality of work is great with affordable pricing. I can recommend them to anyone...
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Raghu Kota
Via Trusted Trader
Advanced Glazing Systems Ltd have provided and outstanding service from start to finish. The door they've provided is great quality and the installation has been...
Read more
Verified Reviewer
Via Trusted Trader
AGS were very friendly and professional from the initial contact for a quote, the appointment for measuring the window and final fitting. Everyone I had...
Read more
K Louch
Via Checkatrade
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.
Mary Magee
Via Trusted Trader
Great service from Start to finish.
After looking around for a while I made the great decision and chose AGS.
From the start Tyler was very professional and helpful on the phone, he sent me pictures by email of doors in the colours I was thinking about and also pictures of the fixtures and fittings so I could compare colours.
Tyler was very communicative throughout the whole process. On the day of installation the fitter was punctual and polite and clearly knew his stuff, door is working a dream. Especially happy with the making good and how he installed the trim, such a clean and tidy finish.
Sam Gleeson
Via Google
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
Via Which?
Brilliant Company. Andy’s communication and response to any queries was excellent. Quality of work is great with affordable pricing. I can recommend them to anyone considering fitting double glazing.
Raghu Kota
Via Trusted Trader
Advanced Glazing Systems Ltd have provided and outstanding service from start to finish. The door they’ve provided is great quality and the installation has been done to a high standard. Customer service has been top tier throughout and I wouldn’t hesitate to recommend them to others.
Verified Reviewer
Via Trusted Trader
AGS were very friendly and professional from the initial contact for a quote, the appointment for measuring the window and final fitting. Everyone I had dealings with were so helpful and I was kept informed throughout. I would 100% recommend AGS to anyone that needs work doing.
K Louch
Via Checkatrade
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We provide completely free, no-obligation quotes for every installation project—whether it’s a small home improvement or a large-scale renovation!
