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
Rated 4.87 / 5
830 Reviews
Rated 9.94 / 10
683 Reviews
Rated 4.9 / 5
366 Reviews
Rated 4.9 / 5
72 Reviews
Rated 4.87 / 5
830 Reviews
Rated 9.94 / 10
683 Reviews
Rated 4.9 / 5
366 Reviews
Rated 4.9 / 5
72 Reviews
Product Features
Exceptional Security
Multi-point locking, shoot-bolt locks, key locking handles, and toughened glass for complete peace of mind.
Energy-Efficient Double Glazing
Double or triple glazing delivers better insulation, reduces heating costs, and keeps warm air inside.
Customisable hardware
Various hardware choices ensure smooth operation, such as the popular monkey tail handles.
Triple Vent Option
Increase airflow and ventilation with the option of a triple vent for improved air circulation.
Woodgrain effects
Authentic woodgrain effects mimic timber windows, offering traditional charm with low maintenance benefits.
Why Casement Windows are a Perfect Fit
Casement windows open outward, either with a side or top hinge, offering unobstructed views, excellent ventilation and easy cleaning with just a damp cloth. Their simple design makes them an affordable option, providing reliable, high-quality windows for traditional homes and modern properties alike.
In terms of material, uPVC is durable, low maintenance, and offers excellent insulation to lower your carbon footprint. Aluminium provides slim sightlines ideal for larger windows, allowing more natural light while delivering a contemporary, long-lasting finish.
The Key Benefits You’ll Love
Here are some highlights our team of experts know you’ll enjoy with UPVC casement windows:
- High-security multi-point locking for the security of your home
- Energy-efficient glazing reduces energy costs and central heating bills
- Customisable styles, including flush windows and casement windows
- Low-maintenance materials and smooth operation
- Perfect for Essex properties, from Billericay to Brentwood, with woodgrain finishes being perfect for conservation areas
Energy Efficiency You Can Trust
With our casement windows, you’ll benefit from the latest energy-efficient double and triple glazing technology. Not only will you save money on heating bills, but you’ll also reduce heat loss and improve the insulation of your home.
- Colours
- Hardware
- Downloads
Wide Range of Colours
From traditional woodgrain foil options to sleek aluminium finishes, our casement windows come in a variety of colours to match the style of your home.
Agate Grey
Anthracite Grey
Black Brown
Brilliant Blue
Chartwell Green
Cream White
Dark Green
Dark Red
Golden Oak
Irish Oak
Mahogany
Natural Oak
Rosewood
Slate Grey
White
Anthracite Grey
Black
Brown
Cream
Dark Blue
Dark Brown
Dark Green
Dark Grey
Dark Red
Gloss White
Grey
Off White
Textured Anthracite Grey
White
Premium Hardware
Our casement windows come with robust, easy-to-operate hardware, offering both style and durability.
Quartus Espag Handle
Sparta Handle
Sparta Cockspur Handle
Virage Handle
Download Specifications & Brochures
Get all the details on our casement windows, including their u-Values and colour options in our downloadable brochures.Compare Window Styles
We offer a wide range of window styles, each with its own unique opening mechanism, appearance, and performance.
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
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
Tilt and Turn Windows Essex
- Easy to clean
- Dual-opening mechanism
- Energy efficient
Your Casement Window Questions Answered
We’re here to help! Have questions about our casement windows? Check out our FAQs below or get in touch via our online contact form.
We provide casement windows to homeowners across London and Essex, including areas like Colchester, Billericay, Chelmsford, and Brentwood.
Double glazing helps reduce heat loss, improves insulation, and boosts the energy efficiency of your home, making it more comfortable year-round.
We offer both uPVC and aluminium casement windows, including flush casement windows, perfect for both traditional and modern homes.
Yes! Choose from a wide range of colours, including realistic woodgrain foil finishes and sleek aluminium options to match your home’s style.
We have years of experience installing high-quality casement windows and double glazing, with a solid reputation across Essex, including Colchester, Brentwood, and beyond.
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
Our 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.
Roof Replacements
Roof Replacements
Roof replacements allow you to make the most of your conservatory by transforming it into space you can use 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.
Conservatories
Conservatories
Our conservatories are designed with thermal efficiency prioritised, ensuring you can enjoy your new space whatever the weather.
Orangeries
Orangeries
Our Livin orangeries combine brick and glass flat roof to create a beautiful, natural extension of your home.
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!
