CONTEMPORARY WINDOW SOLUTIONSOur flush casement windows create a sleek, contemporary appearance where the openable parts sit perfectly flush with the outer frame. Unlike regular casement windows that have a protruding lip, this modern flush casement design delivers clean lines and sophisticated aesthetics. We install both uPVC options from the renowned Residence Collection and premium Sheerline aluminium windows to suit every home.
Having enjoyed a surge in popularity over the past decade, flush casement windows offer a contemporary alternative to standard casement windows, with the sash sitting perfectly level with the outer frame. This creates clean, uninterrupted lines that really boost any property’s appearance.
The flush sash design provides excellent weather sealing and improved security compared to traditional designs. You’ll enjoy impressive thermal efficiency, reduced maintenance, and a modern aesthetic that adds real value to your home.
Choose from an extensive palette including classic whites, contemporary anthracite, and authentic timber finishes like Irish Oak and Silvered Oak. Our dual-colour options let you match your interior décor whilst creating the perfect external impression.
Anodised
Vintage Cream
Silvered Oak
Sage
Rosewood
Pyrite
Pepper Oak
Painswick
Noir
No.10 Black
No.38 Grey
Irish Oak
Honey Oak
Greyish
Grained White
Golden Oak
Ginger Oak
English Oak
Eclectic Grey
Cotswold Green
Cotswold Biscuit
Corse Lawn
Clotted Cream
Clay
Bronze
Anthracite Grey
Slate Grey
Black
White
Dark Silver Metallic
Black Grey
Alux
Walnut
Turner Oak
Steel Blue
Smooth Basalt Grey
Smooth Anthracite Grey
Slate Grey Grained
Simply White
Sage
Ruby Red
Racing Green
Rosewood
Pebble Grey Grained
Pearl Grey
Midnight Black
Mahogany
Irish Oak
Golden Oak
Elephant Grey
Dark Oak
Clotted Cream
Chartwell Green
Black Brown
Our flush casement windows achieve excellent thermal performance with U-values as low as 1.0 W/m²K with triple glazing and 1.4 W/m²K with double glazing. This translates to lower energy bills, and a more comfortable home environment. Security features include:
Cassini (Privacy level 5)
Warwick ( Privacy level 1)
Tribal (Privacy level 5)
Taffeta (Privacy level 3)
Reeded (Privacy Level 2)
Pelerine (Privacy level 4)
Oak (Privacy level 4)
Minster (Privacy level 2)
Mayflower (Privacy level 4)
Florielle (Privacy Level 4)
Everglade (Privacy level 5)
Digital (Privacy level 3)
Contora (Privacy level 4)
Charcoal Sticks (Privacy level 4)
Chantilly (Privacy level 2)
Our uPVC flush casement windows come from the prestigious Residence Collection, featuring advanced multi-chamber designs and authentic timber aesthetics, with the low maintenance benefits of uPVC. The R7 and R9 systems offer seven and nine-chamber profiles respectively, delivering exceptional thermal performance and durability.
For those preferring aluminium windows, we use Sheerline systems with slim profiles and superior strength. The slim frames that aluminium is renowned for allows larger glass panes to be fitted, leading to a higher amount of natural light in the home. Aluminium is also incredibly secure, long-lasting, and durable.
Get answers to common questions about our flush casement window installations and specifications.
Contact UsThe sash sits flush with the outer frame, creating clean lines unlike regular casement windows where sashes protrude. Choose woodgrain effects, and you're promised a modern solution that replicates the appearance of traditional windows, with current glazing technology and functionality.
We install premium uPVC from the Residence Collection and high-quality Sheerline aluminium flush casement systems.
Our flush windows achieve U-values as low as 1.0 W/m²K with triple glazing, earning A+ energy ratings, and promising UK homeowners with lower energy bills.
We serve South London and Surrey, predominantly within 10-15 miles of Sanderstead, including Croydon and surrounding areas.
We offer 10-year frame guarantees, 5-year glass warranties, and 12-month moving parts coverage on all installations, including our flush sash windows.
Traditional sliding sash windows combining period charm with modern uPVC technology and energy efficiency.
Maximise natural light and create stunning architectural features with our beautiful, custom-designed bay and bow window installations.
Versatile inward-opening windows offering secure ventilation and effortless cleaning with simple turn of ergonomic handles.
The UK's most popular window style for modern and traditional homes
Highly recommend Sanderstead Windows! I needed a window handle changed and, rather than charging me for a call-out, they gave me honest advice on how to fix it myself. Their...
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Sanderstead Windows did an excellent job replacing our 100-year-old windows and door. The team was professional, polite, quick and very efficient throughout the installation. They offered great value for money...
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I am over the moon with my smart new windows & notice the difference they have made to the temp in the house already. Colin & his team were on...
Read more
I was looking for someone local who could supply and install Flush casement windows. After meeting with a few suppliers and checking reviews, I chose to go with Sanderstead Windows....
Read more
Colin and Aca done a fantastic job. said they was going to be here at 07:30am and they was bang on time, also said the windows was going to be...
Read more
Top class work from Colin and his team , professional and helpful through the whole process of changing our old French doors to bi-folding doors The standard of the work...
Read more
Highly recommend Sanderstead Windows! I needed a window handle changed and, rather than charging me for a call-out, they gave me honest advice on how to fix it myself. Their tip worked perfectly and saved me a lot of money. It’s rare to find such an honest, helpful local business. I’ll definitely be using them for any future work.
Sanderstead Windows did an excellent job replacing our 100-year-old windows and door. The team was professional, polite, quick and very efficient throughout the installation. They offered great value for money and took the time to guide us through the options so we could make the right decisions for our home. The quality of the work is fantastic and everything looks beautiful. We would definitely choose Sanderstead Windows again and highly recommend them. Thank you so much!
I am over the moon with my smart new windows & notice the difference they have made to the temp in the house already. Colin & his team were on time, professional and very hard working. From the first visit I felt confident that Sanderstead windows were the company for me. No hard sell tactics or silly prices and lots of advice and information. I had 5 quotes in total and am happy to recommend them to anyone. Thank you all at Sanderstead Windows
I was looking for someone local who could supply and install Flush casement windows. After meeting with a few suppliers and checking reviews, I chose to go with Sanderstead Windows. Colin recommended Residence 7 windows, which really look the part. In total Colin installed 9 Windows and a back door, spread over around a year as we worked through a big renovation. I’m really happy with how the job went, the Windows look fantastic, and Colin was flexible and easy to deal with. Highly recommended.
Colin and Aca done a fantastic job. said they was going to be here at 07:30am and they was bang on time, also said the windows was going to be fully fitter within one day, they done by folding doors with blinds in and out all within one day. Very impressed with the workmanship even in the rain, the doors turned out far better than we thought. No decorating needed inside, perfect fit. Fantastic job top marks to the guys. Highly recommended .
Top class work from Colin and his team , professional and helpful through the whole process of changing our old French doors to bi-folding doors
The standard of the work when fitting was high end and clean and tidy throughout
Thank you sanderstead windows ,very happy customers
John and fiona
