Aluminium Sliding Doors
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Steel Look Aluminium Doors
Steel Look Bifold Doors
Steel Look Internal Doors And Screens
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Aluminium Casement Windows
Aluminium Tilt & Turn Windows
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Alitherm 300
More about Alitherm 300 Casement Windows
Versatile system for residential and commercial properties
Our aluminium casement windows are a popular choice for homeowners, architects, and trade professionals looking for a blend of modern design, long-lasting performance, and energy efficiency. At Direct Trade Windows, we manufacture every window in-house using market-leading aluminium systems from Smart and Cortizo. Whether you’re upgrading a traditional home, working on a new build, or delivering a commercial project, casement windows offer clean lines, flexible configurations, and excellent thermal performance.
We offer three premium casement window systems to suit a range of budgets and design requirements: the reliable Alitherm 300, the enhanced Alitherm 400 with improved energy ratings, and the sleek, high-spec Cortizo Casement. Each is built to order and backed by our technical expertise, responsive service, and a commitment to quality that’s earned us a strong reputation since 2002.
Key Features:
- Modern, slimline design: Clean sightlines and a contemporary finish
- Energy efficiency: Thermally broken aluminium profiles for low U-values
- Versatile configurations: Side-hung or top-hung openings available
- Secure and compliant: Multi-point locking and PAS24-certified options
- Customisable finishes: Choose from hundreds of RAL colours, dual colours, and textured coatings
- In-house manufacturing: Built to order for full quality control and faster lead times
Our Casement Windows
Trusted manufacturers since 2000
Professional Installer Network
Quick Supply
Made in the UK
Exceptional Quality Control
Knowledgeable Family Run Business
Bespoke Complex Products Fabricated
Aluminium Casement Windows - Your Questions Answered
Explore common questions about our Aluminium Casement Windows, suitable for both residential and commercial properties. Discover how these windows offer durability, performance, and energy efficiency.
Get a Free Quote for Alitherm Heritage Casement WindowsWhat are Aluminium Casement Windows, and where can they be installed?
Aluminium casement windows are a versatile window system suitable for both residential and commercial properties. They can be installed in various settings, including homes, offices, and other commercial buildings.
What are the key features of these casement windows?
These casement windows offer versatility with options such as fixed, single or double sash, top hung, tilt & turn, or pivot styles. They are thermally efficient thanks to a polyamide thermal break, built for long-term durability, and equipped with full PAS24 accreditation for security.
Can I get custom dimensions for these casement windows?
Yes, you can. Depending on your needs, you can choose from a variety of dimensions for side hung, top hung, and fixed casement windows, providing flexibility for different project requirements.
Are these windows suitable for projects that require planning permission?
Yes, these casement windows, particularly using Smart's Alitherm models, are ideal for projects that require planning permission due to their versatile and high-quality design.
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