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Alitherm 300
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Trusted manufacturers since 2000
Professional Installer Network
Quick Supply
Made in the UK
Exceptional Quality Control
Knowledgeable Family Run Business
Bespoke Complex Products Fabricated
Cortizo casement windows offer a sleek, high-performance solution for residential and commercial projects that demand exceptional energy efficiency and elegant design. Manufactured in-house by Direct Trade Windows using premium aluminium profiles from Cortizo, these windows deliver long-lasting durability, excellent insulation, and a modern, minimal aesthetic. Whether you're upgrading a contemporary home or working on a bespoke architectural design, Cortizo windows offer impressive flexibility and premium finish options.
Known for their refined engineering and slimline appearance, Cortizo casement windows feature robust thermal breaks and multipoint locking systems as standard. They’re available in side-hung or top-hung formats and can be tailored in size, colour, and glazing options to suit your exact requirements. Backed by our technical expertise and outstanding customer support, they’re an ideal choice for customers who want the perfect balance of performance, style, and long-term value.
Key Features:
- Premium aluminium profiles: Sleek, modern design with slim sightlines
- High thermal performance: Integrated thermal breaks for improved energy efficiency
- Secure design: Multipoint locking for enhanced safety and peace of mind
- Flexible configuration: Side-hung or top-hung openings available
- Bespoke finishes: Available in a wide range of RAL colours and textured coatings
- In-house manufacturing: Built to order with full quality control and expert support
Technical Specification
Technical Specification – Cortizo Casement Windows
- Thermal Transmittance (Uw): As low as 0.9 W/m²K (depending on configuration and glazing)
- Acoustic Insulation: Up to Rw = 45 dB
- Glazing Thickness: Minimum 23 mm, maximum 44 mm
- Sightlines: Frame 70 mm | Sash 70 mm
- Profile Thickness: 1.6 mm
- Polyamide Strip Length: 32 mm
- Opening Types: Inward opening – side hung or top hung
- Flush Version Sightlines: Frame 65 mm | Sash 70 mm
- Standard Version Sightlines: Frame 79 mm | Sash 79 mm
- Max Sash Dimensions (Slim Sash):
- Side hung: 950 mm (W) x 1,300 mm (H)
- Top hung: 1,200 mm (W) x 1,300 mm (H)
- Max Sash Dimensions (Heavy Duty Sash):
- Side hung: 750 mm (W) x 1,750 mm (H)
- Top hung: 1,800 mm (W) x 1,800 mm (H)
- Max Sash Weight:
- Slim sash: 35 kg (side) / 50 kg (top)
- Heavy duty: 42 kg (side) / 100 kg (top)
- Air Permeability: Class 4 (UNE-EN 12207)
- Water Tightness: Class E1200 (UNE-EN 12208)
- Wind Resistance: Class CE 2400 (UNE-EN 12210)
- Security Test: Passed (based on 1.44m x 1.33m reference sample)
- Material: Aluminium alloy 6063 T5
- Finish Options: Dual colour, RAL powder-coated, wood effect (Qualideco), anodised (Ewwa Euras)
Colours
White aluminium frame colour finish sample.
Matt white aluminium frame colour finish sample.
Matt brown aluminium frame colour finish sample.
Jet black aluminium frame colour finish sample
Grey aluminium frame colour finish sample.
Gloss white aluminium frame colour finish sample.
Gloss off white aluminium frame colour finish sample.
Dark red aluminium frame colour finish sample.
Dark grey aluminium frame colour finish sample.
Dark green aluminium frame colour finish sample.
Dark brown aluminium frame colour finish sample.
Dark blue aluminium frame colour finish sample.
Cream aluminium frame colour finish sample.
Black aluminium frame colour finish sample.
Anthracite grey aluminium frame colour finish sample.
Airforce grey aluminium frame colour finish sample.
Glass
Unglazed aluminium window frame with angled top.
Standard self-clean glass panel with clear finish.
Standard toughened glass panel with clear finish.
Clear solar control glass panel for improved comfort and energy efficiency.
Self-cleaning glass panel designed to break down dirt and reduce cleaning frequency.
Self Clean Solar Control panel combining dirt-repelling and heat-reducing technology.
Satin obscure glass panel with smooth frosted finish.
Laminated security glass panel with clear finish.
Hardware
Pear Drop Handle
Monkey Tail Handle
close up of steel look hardware
steel look window hardware
Brochure
Gallery
A modern redbrick detached house with large, reflective windows, a landscaped front garden, and a blue sky with scattered clouds in the background.
Front view of a modern detached house with black casement windows, red tiled upper walls, and a double garage with one blue car inside.
FAQs About Cortizo Casement Windows at Direct Trade Windows
What are Cortizo casement windows?
Cortizo casement windows are premium aluminium windows known for their sleek design, energy efficiency, and outstanding performance in modern homes.
Are Cortizo casement windows energy efficient?
Yes, they achieve excellent thermal insulation with low U-values and can be paired with double or triple glazing to reduce heat loss.
Can Cortizo casement windows be customised?
Absolutely. Cortizo offers a wide range of opening styles, sizes, and finishes, including bespoke powder-coated colours to match any design.
Do Cortizo casement windows meet building regulations?
Yes, Cortizo casement windows are fully compliant with UK Building Regulations, covering thermal performance, ventilation, and enhanced home security.
Are Cortizo casement windows secure?
Yes. They are compatible with advanced multipoint locking systems and can be manufactured to meet PAS 24 and Secured by Design standards.
What glazing options are available with Cortizo casement windows?
They support double and triple glazing with options for acoustic control, solar protection, and laminated safety glass for additional strength.
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