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Casement Windows

Create your ideal Casement Window with our intuitive software, offering complete customisation of size, colour and materials.

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Horizon Windows & Doors
5.0
Based on 20 reviews
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Romica Visan
12:02 17 Oct 25
Guy Maddison
10:35 09 Oct 25
Purchased new windows for a job we are doing for a customer in Portsmouth. These guys are great. Very responsive and know what they are talking about. They also keep up with building regulations to make sure everything they supply meets the standard. Thanks!!!!
Danny
10:21 09 Oct 25
Bought a set of bifolds very swift with delivery and good quality product. Thanks
daniel clark
13:03 15 Jul 25
Bought a bifold door and two windows
Great price and swift delivery!
Thanks.
Steve Winterberg
18:52 29 Jun 25
I have been using Horizon windows and doors on our properties and those of customers for over 10 years now and never ever had anything other than 1st class service and quality - light tunnels, roof lights, french and sliding doors, windows in plain, woodgrain and painted finishes and the replacement of blown sealed units originally fitted by others. Thoroughly recommend! Great company with 1st class professional staff.
jason knight
17:42 19 Jun 25
Bought a set of bifolds for new extension. Great guidance and friendly service from josh and his team. Product arrived on time and excellent quality. Very pleased and warm friendly family run business
Dan Ette
19:02 18 Jun 25
Great service
Imogen Farrell
17:55 18 Jun 25
Great experience! Ordered bifold doors and a roof lantern, everything arrived on time and looks amazing. Good prices, helpful support, and solid quality. Would definitely use them again.
Nicola Lilley
08:13 15 Jun 25
Great service- Window was installed quickly and promptly. Thanks so much. Would recommend!
Robert Belcher
15:46 14 Jun 25
Supplied and fitted a set of bi-fold doors in our new extension. Good workmanship and took away all waste afterwards. The doors look great and its really finished off our new patio area. Thumbs up ?
John Varndell
18:22 08 Apr 25
James Black
10:43 26 Mar 25
I used horizon windows & doors to carry out some work on our extention.. the quality of work and service received was excellent... highly recommend...
Vincent Dunne
21:03 20 Mar 25
We recently had bifold doors and windows installed and we couldn’t be happier with the results! From start to finish, their team was professional, knowledgeable, and incredibly helpful.

The quality of the doors and windows is outstanding and clearly built to last. The installation process was smooth and efficient, with great attention to detail. They kept us informed throughout, ensuring everything was perfect. Highly recommend to anyone looking!
Steven Wight
20:51 19 Mar 25
I used horizon for windows for my extension, we had a great service from start to finish we are using them again later in the year to replace the existing house windows after seeing the quality of the ones for our extension, super pleased with them.
Emine Holden
20:45 19 Mar 25
I purchased five windows for my home, and the experience was seamless. The team was professional, efficient, and very helpful throughout the process. Highly satisfied with their service!

Explore our premium Casement windows

Our uPVC casement windows require minimal upkeep and are guaranteed to never peel, flake, fade, rust, or rot. Custom-built to your specifications, these windows are installed with precision for a perfect, snug fit, ensuring long-lasting durability, security, and excellent energy efficiency.

Everest’s triple and double glazing are among the best-performing windows available, offering exceptional U-values that maximise energy efficiency. Opting for these high-performance windows can help reduce your energy costs and minimise your environmental impact.

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Our Casement Windows

Casement windows are recognisable by sashes that are attached to their frame via one or more hinges.

Our casement windows are made from high-quality, low-maintenance uPVC, offering durability, thermal efficiency and striking design. Inspired by surrounding architecture, our versatile designs suit both modern and period homes. Choose from over 50 configurations, including side-hung, top-hung, and fixed panel options, with complete control in your hands.

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Aluminium Casement Windows

Aluminium is a robust and lightweight material that forms a natural oxide coating, offering excellent corrosion resistance.

This makes it one of the most durable framing options available. As a result, aluminium casement windows are built to last for decades, making them a top choice for homeowners seeking long-lasting quality.

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