Fully Flush Aluminium Casement Window - Casement Window

A True Flush Aluminium Casement Window for Contemporary Architecture

The Stellar Fully Flush Aluminium Casement Window is a premium window system designed for architects and specifiers seeking a clean, modern aesthetic without compromising on performance. With a true flush finish on both the interior and exterior, this aluminium casement window delivers minimalist styling, exceptional thermal efficiency, and robust security—making it ideal for residential, commercial, and mixed-use developments.

Part of the award-winning Stellar Aluminium range by Epwin Window Systems, this system is engineered to meet the highest standards of design, fabrication, and compliance.

Design & Aesthetic Excellence

Unlike traditional aluminium casement windows, the Stellar Fully Flush system features a sash that sits perfectly flush within the frame on both sides. This creates a seamless, flat surface that enhances the visual appeal of any elevation, whether in a contemporary home or a commercial façade.

• True flush finish inside and out—no stepped profiles
• Slim sightlines for up to 12% more glass area than comparable systems
• Modern, minimalist styling ideal for new-builds and refurbishments
• Astragal bar options available for traditional detailing
• Compatible with bay and bow window assemblies

Thermal Performance & Energy Efficiency

The Stellar Fully Flush Aluminium Casement Window is designed to meet and exceed the requirements of Approved Document L without the need for foam inserts or complex enhancements. Its advanced thermal break technology and multi-seal design ensure excellent insulation and energy savings.

• U-values as low as 1.0 W/m²K with triple glazing
• U-values of 1.4 W/m²K with double glazing
• WER up to A++
• 40mm and 45mm polyamide thermal breaks
• Under-glass seals, tailed glazing gaskets, and frame centre seals

These features contribute to reduced heat loss, improved occupant comfort, and long-term energy efficiency.

Security & Compliance

This aluminium casement window is built to meet the highest standards of safety and security, making it suitable for both residential and commercial applications.

• PAS 24:2016 accredited
• Secured by Design compliant
• Approved Document Q compliant
• Multi-point locking systems and robust hardware
• 10-year mechanical guarantee

Fabrication & Installation Benefits

The Stellar system is designed with fabricators and installers in mind, offering a range of features that simplify manufacturing and reduce time on site.

• Reverse butt joint allows internal glazing without dummy sashes
• Knock-in beads and flat rebates for easy installation
• Post-installation beading minimises site damage
• No adaptors required for top-hung, side-hung, or fixed lights
• Bead sizes: 28, 36, and 44 mm

These innovations make the Stellar Fully Flush Aluminium Casement Window one of the most fabricator-friendly systems on the market.

Material & Finish Options

Manufactured from high-grade aluminium and finished with durable powder coating, the system offers a wide range of colour and texture options to suit any architectural style.

• Extensive RAL colour range
• Dual-colour options for internal/external contrast
• 25-year surface finish guarantee
• Hardware finishes: satin silver, polished chrome, white, black

Applications

This aluminium casement window is suitable for a wide range of applications, including:

• Contemporary residential developments
• Urban apartments and mixed-use buildings
• Commercial offices and retail units
• Public sector buildings such as schools and healthcare facilities
• Refurbishment and retrofit projects, including conservation areas (subject to planning)

Its combination of flush aesthetics, thermal performance, and security makes it a versatile choice for modern architecture.

Digital Specification Support

To support digital workflows and BIM Level 2 compliance, the Stellar Fully Flush Aluminium Casement Window is available as a BIM object in multiple formats:

• Revit, IFC, and DWG
• COBie-compliant data
• Full metadata for scheduling, performance analysis, and integration into digital models

Why Specify Stellar Aluminium Casement Windows?

• True flush aesthetics inside and out
• Outstanding thermal and acoustic performance
• Slim sightlines and increased glass area
• Secure, compliant, and future-ready
• Designed for efficient fabrication and installation
• Backed by Epwin’s industry-leading support and warranties