Bay & Bow Windows
- Stylish outward projection for more space and extra light
- Available in uPVC or aluminium materials
- Highly energy-efficient with A-rated glazing
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
Casement Windows
- Secure and energy-efficient designs
- Available in uPVC and aluminium
- Perfect for traditional homes and modern spaces
Flush Casement Windows
- Sash sits level with the frame for a clean, minimalist look
- Available in durable uPVC for strength and longevity
- Wide selection of stunning woodgrain effects and colours to choose from
Heritage Windows
- Aluminium frames provide a heritage finish
- Thermal A-Rated Glass as standard
- Range of RAL colours available
uPVC Sliding Sash Windows
- Made from durable and customisable uPVC materials.
- High energy efficiency for reduced energy bills.
- Traditional and in-demand aesthetic
Tilt and Turn Windows Essex
- Easy to clean
- Dual-opening mechanism
- Energy efficient
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
Explore Our Window Range
Our windows come in a wide variety of styles, including casement, sash, tilt & turn, and both aluminium and uPVC materials. Each window is made to measure, with a range of colours, glazing, and hardware choices available.
They’re built with thermal performance and security in mind, helping to lower energy bills and protect your home. Our friendly team is always on hand to answer your questions and help you choose the perfect fit.
Contact UsFrequently Asked Questions
Our FAQs cover everything from styles and lead times to guarantees and energy ratings. Find quick answers to common questions below.
We offer a full range of window styles, all customisable to match your home’s look and your personal taste.
Yes – all our windows are built to modern thermal standards to reduce heat loss and cut energy costs, with double glazing as standard.
Absolutely. Every installation includes a 10-year manufacturer’s guarantee and a free insurance-backed warranty, great for your complete peace of mind.
Yes, you can select from a wide palette of colours and finishes, including woodgrain effects and dual-colour options.
We install across Essex and London, including Chelmsford, Basildon, Billericay, Brentwood, Colchester, and Maldon. With years of experience in our locker, we offer uPVC windows, roof lanterns, sliding sash windows, bay windows, composite door systems, front doors, bifold doors, patio doors, French doors, and more.
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.
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...
Read more
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...
Read more
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
Convenient Video Appointments Available
We offer video appointments for all our services, allowing you to get expert advice from the comfort of your home.
Book your video appointment todayOur Products
As well as windows, we also supply and install doors, conservatories, and roofline products—all made with the same focus on quality, security, and thermal efficiency.
Roof Lanterns
Roof Lanterns
Roof lanterns are a perfect way to transform a living space with natural light.
Glazed Roofs
Glazed Roofs
Glazed roofs are a thermally efficient way to fill a conservatory with light and atmosphere.
Conservatories
Conservatories
Our conservatories are designed with thermal efficiency prioritised, ensuring you can enjoy your new space whatever the weather.
Roof Lights
Roof Lights
Perfect for flat roofs, roof lights allow sunlight to fill your space, making rooms feel brighter, more open, and even bigger.
Doors
Doors
Choose from composite, aluminium, and uPVC door materials for unbeatable performance and stunning kerb appeal.
Get in touch for a free quote!
We provide completely free, no-obligation quotes for every installation project—whether it’s a small home improvement or a large-scale renovation!
