Casement Windows
- Secure and energy-efficient designs
- Available in uPVC and aluminium
- Perfect for traditional homes and modern spaces
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
Product Features
uPVC Durability
Built to last, low-maintenance and weather resistant.
Timeless Aesthetics
Authentic appearance with traditional detailing and charm.
Smooth Ventilation
Open the top or bottom sash for fresh air.
Custom Finishes
Range of uPVC colours and woodgrain options.
Easy Maintenance
Wipe-clean uPVC for simple, no-fuss upkeep.
Why uPVC is the Ideal Choice for Sliding Sash Windows
uPVC provides outstanding thermal performance, significantly reducing heat loss and keeping your home warmer in the winter and cooler in the summer. It’s also highly durable and low-maintenance, offering homeowners a long-lasting solution that requires minimal attention.
Additionally, uPVC sliding sash windows can be tailored to suit your home’s specific aesthetic, offering a combination of traditional design and modern functionality that ensures your home stays stylish and energy-efficient for years to come.
Key Benefits of uPVC Sliding Sash Windows
Some key reasons to consider sliding sash windows:
- Traditional design with a modern touch
- Excellent thermal performance helps lower energy bills.
- Easy-to-operate vertical sliding mechanism for unrivalled ventilation
- Customisable finishes to suit the style of your home, including woodgrain effects.
- Low-maintenance uPVC material that only requires a quick wipe to keep clean.
- Ideal for homeowners looking for a high-quality, aesthetically appealing solution for their home.
Energy Efficient
Customise your new sliding sash windows to perfectly suit the style of your home. From a wide range of colours and authentic woodgrain finishes to high quality hardware and glazing options, our uPVC sash windows can be tailored to match any traditional or contemporary aesthetic. Download our brochure to see the full range.
- Colours
- Downloads
Colour swatches
Our uPVC sliding sash windows come in a wide range of colours, including realistic woodgrain effects, allowing you to customise your windows to match the aesthetics of your home.
White
Textured Anthracite Grey
Off White
Grey
Dark Red
Gloss White
Dark Grey
Dark Green
Dark Brown
Dark Blue
Cream
Brown
Black
Anthracite Grey
White
Slate Grey
Rosewood
Natural Oak
Irish Oak
Mahogany
Golden Oak
Dark Red
Dark Green
Cream White
Brilliant Blue
Chartwell Green
Black Brown
Anthracite Grey
Agate Grey
Downloads
Download our brochure for detailed information about our sliding sash windows, including product specifications and design options, to help you make the best choice for your next home improvement.Compare Window Styles
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
Tilt and Turn Windows Essex
- Easy to clean
- Dual-opening mechanism
- Energy efficient
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
Your Sliding Sash Window Questions Answered
uPVC sliding sash windows provide excellent thermal performance, easy cleaning, and a stylish design that works well with both traditional homes and modern properties.
Yes, our uPVC sliding sash windows are designed to offer excellent thermal insulation, significantly reducing heat loss and improving energy efficiency in your living space.
We offer a range of colour options, including woodgrain effects, allowing you to match your sliding sash windows to the style of your home.
Yes, uPVC sliding sash windows are very low maintenance and can be cleaned easily with a quick wipe, keeping them looking great for years and providing welcome peace of mind.
We work across Essex and London, including Upminster, Romford, Chigwell, Chelmsford, Hornchurch, and Basildon. Our expert installers deliver high-quality sash window installations throughout the South East.
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 todayRead 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
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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!
