Energy efficiency
A-rated glazing that keeps warmth in and heating bills down.
Why casement windows are the UK's first choice
Casement windows are the UK's most popular style for good reason. Their outward-opening design creates a tight compression seal when closed, reducing draughts, heat loss, and the risk of intrusion. Available in uPVC, aluminium, or timber, they suit any property – from traditional cottages and period homes to modern new builds.
- Superior thermal insulation, reducing heating bills year-round
- Multi-point locking systems for robust, tested security
- Full-width ventilation for natural airflow throughout your home
- A choice of uPVC, aluminium or timber frames to suit your home and budget
- Clear, unobstructed sightlines to maximise natural light
Enhanced security
Multi-point locks compress the sash firmly against the frame.
Maximum ventilation
Opens fully to funnel fresh air directly into your living space.
Choice of materials
Available in uPVC, aluminium or timber – each offering its own blend of style, performance and durability.
- Colours
- Glazing & Security
- Downloads
A colour and finish to complement every home
Whether you choose uPVC, aluminium or timber, our casement windows are available in a wide palette of finishes – from classic white to contemporary greys, bold modern shades and authentic woodgrain effects – so you can match your new windows perfectly to your property.
Grey
Black
Chartwell Green
Cream
Golden Oak
Irish Oak
Rosewood
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
Glazing and security you can rely on
Whatever frame material you choose – uPVC, aluminium or timber – our casement windows are fitted with high-performance double or triple glazing for outstanding thermal efficiency. All opening sashes include multi-point locking as standard, with internally beaded frames that prevent glass from being removed from the outside – giving you genuine, tested peace of mind.
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Product information and brochures
Download our casement window brochures for full specifications, glazing options, colour charts and technical data across our uPVC, aluminium and timber ranges – helping you make the right choice for your home.
Professional installation, done properly from the start
At Allglass Anglia, we follow a coordinated, trade-led installation process. We hold cavity closer stock in-house, cut to size for your exact opening, so everything is ready before a single frame goes in. Your bricklayer fits the cavity closers first, and we follow with the window installation – eliminating delays and protecting the structural integrity of every opening.
Our Cavalok cavity closers are compatible with uPVC, aluminium and timber frames alike, so whichever option you choose, the installation is equally precise.
Custom-sized for any opening, any property
No two homes are the same, which is why we manufacture cavity closer profiles to suit any shape or size of opening – whether you’re replacing a single window or upgrading an entire property. Every component is cut and prepared at our premises before it reaches your site.
From period properties with non-standard openings to modern new builds requiring precise tolerances, Allglass Anglia supplies and installs casement windows in uPVC, aluminium and timber that fit first time. Tell us what you need and we’ll take care of the rest.
Trusted, certified and industry approved
14 accreditations that speak for our standards
Our accreditations are not box-ticking exercises – they are the evidence of a business that takes quality, safety and compliance seriously. Each certification reflects the rigorous standards we hold ourselves to on every project we undertake.
From FENSA registration to industry body memberships, our credentials give homeowners, developers and contractors the confidence to choose Allglass Anglia as their glazing partner of choice.
Common questions about casement windows
Have a question about casement windows, frame materials, sizing or our installation process? Here are the answers our customers ask most often – and we're always happy to talk through anything else.
A casement window is hinged at the side or top and opens outward like a door. It's the most common window style in the UK, valued for its ventilation, security and clean aesthetic. We supply casement windows in uPVC, aluminium and timber, so you can choose the frame material that best suits your home.
Yes. When closed, the sash compresses tightly against the frame, creating an airtight seal that minimises heat loss. Our windows are A-rated for energy efficiency as standard, whether you choose uPVC, aluminium or timber frames.
Very secure. Modern casement windows use multi-point locking systems that secure the sash at several points around the frame, making them extremely difficult to force from the outside.
With quality frames and minimal upkeep, casement windows can last 20 to 30 years or more – and some timber and aluminium frames even longer with proper care – making them a sound long-term investment for any home.
Can’t see the answer you’re looking for?
We have worked with Allglass for several years now and consider them a trusted supply...
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Peter Puttock
Morgan Sindall
We have worked with Allglass successfully across multiple projects and delivery schemes throughout Suffolk. Their...
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Andy Bates
Concertus
We have worked together with All-Glass on numerous projects and recommend their service, both in...
Read more
Tristan Smith
Smith of Honingham
It has been a pleasure working with All Glass. Their team has consistently delivered in...
Read more
Matt Beaman
Crest Nicholson
We have been using Allglass for around 15 years and have built up and excellent...
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Damien Kerry
Barnes Construction
Outstanding! I found this company after my elderly mum got ripped off by a door...
Read more
Sybil Bell
via Google
We have worked with Allglass for several years now and consider them a trusted supply chain partner to deliver the packages they excel in on our varied projects from a single door set to complex curtain walling systems. Package management is precise from preconstruction to delivery on site and beyond to aftercare. Our contact points in Sean & Darrin are attentive in all respects from early engagement on advice, to completion of their order with unwavering commitment. Allglass, where we can have in the mix, will remain so moving forward on the projects we feel can benefit from their input, which includes the full support they provide in support of our wider culture and approach to Safety Health & Environment, carbon reduction, Social Value Initiatives , and Enhanced Quality delivery as this is valued and key to both our successes
Peter Puttock
Morgan Sindall
We have worked with Allglass successfully across multiple projects and delivery schemes throughout Suffolk. Their consistent quality, professionalism and collaborative approach have made them a valued and trusted supply chain partner. Time and again, they have demonstrated a commitment to delivering excellent outcomes and working positively with clients, consultants and contractors alike.
Andy Bates
Concertus
We have worked together with All-Glass on numerous projects and recommend their service, both in pre-production, production and aftersales. Ben has always been very responsive, and we look forward to working together in the future.
Tristan Smith
Smith of Honingham
It has been a pleasure working with All Glass. Their team has consistently delivered in line with the programme, always maintaining a proactive and collaborative approach to overcoming any issues that arose. Their product quality has been excellent, and their commitment to customer care has been outstanding throughout the development. They have been responsive, professional, and focused on delivering the right outcome, making them a reliable and valued supply chain partner. I would have no hesitation in recommending All Glass and look forward to working with them again on future projects.
Matt Beaman
Crest Nicholson
We have been using Allglass for around 15 years and have built up and excellent relationship with the business and their team over this time. We would happily recommend them to others and have found their service and quality to be of the highest order.
Damien Kerry
Barnes Construction
Outstanding! I found this company after my elderly mum got ripped off by a door to door window salesman. I managed to cancel that order and shopped around to find a local company that would look after my mum properly. Allglass were amazing. Friendly, honest, transparent, reliable. They were caring and mindful that my mum had been ripped off before. Their prices are sensible and fair and the quality of the workmanship is superb. I hope people considering any work like this will use this company - can highly recommend them.
Sybil Bell
via Google
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