Stellar Aluminium Flush Casement Window - Casement Window
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A flush aluminium casement window offering minimalist aesthetics, enhanced thermal performance, and up to 12% more glass—ideal for modern residential and commercial applications.
Application
The Stellar Flush Aluminium Casement Window is designed for use in a wide range of architectural applications where clean aesthetics, thermal efficiency, and robust performance are essential. Its true flush design, slim sightlines, and high-performance aluminium construction make it an ideal solution for both contemporary new-builds and sensitive refurbishment projects.
Residential Developments
This aluminium casement window is particularly well-suited to high-end residential schemes, including detached homes, apartments, and luxury housing developments. Its minimalist flush styling enhances modern façades, while the increased glazed area maximises natural light and visual connection to the outdoors. The system’s thermal performance supports compliance with Part L of the Building Regulations, helping developers meet energy efficiency targets without compromising on design.
Urban and Mixed-Use Projects
In urban environments where space, light, and visual impact are critical, the Stellar Flush Aluminium Casement Window offers a refined solution. Its slim profiles and flush finish contribute to sleek, contemporary elevations, making it ideal for mixed-use buildings, city apartments, and regeneration schemes. The system’s compatibility with a wide range of finishes and hardware options allows for customisation to suit branding or planning requirements.
Commercial and Office Buildings
For commercial applications, including office blocks and business parks, this aluminium casement window provides a professional, modern appearance with long-term durability. Its robust aluminium frame and high-quality surface finish ensure low maintenance and resistance to environmental wear, while its security credentials (PAS 24 and Secured by Design compliance) meet the demands of high-traffic environments.
Education and Public Sector
The Stellar Flush Aluminium Casement Window is also suitable for schools, colleges, and public buildings where performance, safety, and longevity are key. Its flush design reduces dirt traps and simplifies cleaning, while its thermal and acoustic insulation properties contribute to comfortable internal environments. The system’s ease of installation and post-installation beading reduce disruption on site—an important consideration for live environments.
Refurbishment and Retrofit
Thanks to its clean lines and adaptable design, this aluminium casement window is an excellent choice for refurbishment projects, including those in conservation areas (subject to planning). Its flush aesthetic can replicate traditional timber or steel windows while delivering modern performance standards. The system’s ability to achieve low U-values and high WER ratings makes it ideal for upgrading existing buildings to meet current energy standards.
Description
Stellar Flush Aluminium Casement Window
A Modern Aluminium Casement Window for High-Performance Architecture
The Stellar Flush Aluminium Casement Window is a premium window system designed for contemporary residential and commercial buildings. With its true flush finish on both the interior and exterior, this aluminium casement window delivers a sleek, minimalist aesthetic while offering outstanding thermal performance, security, and ease of installation.
Ideal for new-builds, refurbishments, and mixed-use developments, the Stellar system redefines what’s possible with aluminium casement windows—combining architectural elegance with technical excellence.
Architectural Design & Aesthetic Appeal
This aluminium casement window system features a true flush sash and frame on both sides, creating a clean, flat surface that enhances modern façades. Unlike traditional stepped systems, Stellar offers a seamless look that aligns with contemporary design trends.
- Flush inside and out – no stepped profiles
- Slim sightlines – up to 12% more glass area than comparable aluminium casement windows
- Modern styling – ideal for high-end homes, apartments, and commercial buildings
- Optional astragal bars – for traditional detailing where required
Thermal Efficiency & Energy Compliance
The Stellar Flush Aluminium Casement Window is engineered to meet and exceed current UK Building Regulations, including Approved Document L, without the need for foam inserts or complex enhancements.
- U-values as low as 1.0 W/m²K with triple glazing
- WER up to A++
- 40mm and 45mm polyamide thermal breaks
- Flat rebates for easy-fit glazing packers
- Knock-in beads for simplified installation
These features ensure the aluminium casement window contributes to energy-efficient building envelopes, supporting sustainability goals and reducing operational costs.
Security & Regulatory Compliance
Designed with security in mind, the Stellar aluminium casement window can be specified to meet:
- PAS 24:2016
- Secured by Design
- Approved Document Q
It supports high-security hardware, including multi-point locking systems and robust friction hinges, ensuring compliance and peace of mind for specifiers and end users.
Fabricator & Installer Benefits
Stellar is one of the most fabricator-friendly aluminium casement window systems on the market. It includes several innovations that reduce time on site and improve build quality:
- Reverse butt joint – allows internal glazing without dummy sashes
- Post-installation beading – minimises site damage
- No adaptors required – for top-hung, side-hung, or fixed lights
- Fully integrated trims, cills, and bay/bow assemblies – for complete design flexibility
Material & Finish Options
Manufactured from high-grade aluminium with a durable powder-coated finish, the Stellar Flush Casement Window is available in a wide range of colours and textures to suit any architectural scheme.
- 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
- Refurbishment and retrofit projects
- Conservation areas (with appropriate finishes)
Its clean lines and high performance make it particularly well-suited to projects where architectural integrity and energy efficiency are paramount.
Digital Specification Support
To support digital workflows and BIM Level 2 compliance, the Stellar 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?
- Architectural-grade aluminium with flush aesthetics
- 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
General information
Color | Black Brown Cream Grey White |
Material | Aluminium |
Shape | Square Rectangle |
Length | Bespoke Guidance for specification option: Maximum size 1221 x 1221 mm (top hung) or 721 x 1321 mm (side hung). |
Width | Bespoke |
Height | Bespoke |
Warranty description | Ten year Guidance for specification option: Mechanical performance guarantee. 25 year Guidance for specification option: Surface finish guarantee. |
Uniclass | |
CAWS | L10/25 Aluminium windows L10/330 Aluminium windows |
Product range |
Specification data - Aluminium window units
Classification data | |
Description | Flush casement window. |
Manufacturer | Epwin Window Systems. |
Dimensions and configurations | Guidance for specification option: Insert size requirements. |
Product performance | |
Weather performance | |
UK exposure category | 2000 Pa. |
Air permeability | Class 4 (600 Pa). |
Watertightness | Class 9A (600 Pa). |
Resistance to wind load | Class C5 (2000 Pa). |
Safety | |
Security level | To Secured by Design standard/ To PAS 24. |
Thermal | |
Whole window U-value | 1.4 W/m²K (double glazing); 1.1 W/m²K (triple glazing). Guidance for specification option: Best performance figures, tested and approved by UKAS. Consult manufacturer to provide calculations on accurate weather performance based on your specific requirements. |
Frame | |
Profile | 26 mm. 28 mm. 36 mm. 44 mm. Guidance for specification option: Fully flush only. |
Finish as delivered | |
Colour | Anthracite Grey Flat/ Matt RAL 7016. Guidance for specification option: Stock colour. Anthracite Grey/ Signal White Flat/ Matt RAL 7016 / 9003. Guidance for specification option: Stock colour. Jet Black Flat/ Matt RAL 9005. Guidance for specification option: Stock colour. Jet Black/ Signal White Flat/ Matt RAL 9005 / 9003. Guidance for specification option: Stock colour. Signal White Flat/ Matt RAL 9003. Guidance for specification option: Stock colour. Agate Grey Flat/Matt RAL 7038. Guidance for specification option: Available upon request. Anthracite Grey Textured RAL 7016. Guidance for specification option: Available upon request. Chocolate Brown Flat/Matt RAL 8017. Guidance for specification option: Available upon request. CreamFlat/MattRAL 9001. Guidance for specification option: Available upon request. Slate Grey Flat/Matt RAL 7015. Guidance for specification option: Available upon request. |
Glazing or infill | |
Requirements | Double glazed. Triple glazed. |
Hardware | Manufacturer guidanceThe range includes styles and finishes to suit all projects. Consult manufacturer for details and insert requirements. |
Operation | |
Type | Manual. |
Fixing features | Top hung. Side hung. |
Cill profile | 100 mm. 150 mm. 200 mm. |
Sustainability data
Country of product manufacture | United Kingdom |
Manufacturing plant location | |
Material | Aluminium |
Recycled contentAs defined in clause 7.8 of BS EN ISO 14021 | 100 % |
Expected Life | 60 year |
Literature
Literature type
Stellar Window and Door range
STE18774 Stellar Flush Casement datasheet update_web2
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