Aluminium Casement Windows – Architectural Elegance & Superior Performance

Aluminium casement windows combine the architectural precision and slim sightlines that only aluminium can deliver with the practicality and versatility of the classic casement opening style. Side-hinged to open outward or inward, casement aluminium windows provide excellent natural ventilation and are suitable for virtually any room in your home. Northern Storm installs premium thermally broken aluminium casement windows across Northern Ireland and the Republic of Ireland, working with homeowners, architects, and developers to deliver outstanding results.

The slim profile of aluminium casement windows is one of their most visually striking attributes. Where a standard uPVC casement frame may have a visible sightline of 100-120mm, our aluminium systems can achieve sightlines of 60-80mm, dramatically increasing the proportion of glass to frame. In single-storey extensions, orangeries, and contemporary new builds, this difference is transformative, creating spaces that feel more open, lighter, and more connected to the outdoors.

Our aluminium casement windows use a polyamide thermal break that separates the inner and outer aluminium sections, preventing the direct transfer of cold from the outside to the inside of the frame. Combined with A-rated double glazing or triple glazing options, these windows achieve whole-window U-values that meet or exceed Irish Part L building regulation requirements and are suitable for use in energy-efficient retrofit and new build projects requiring NZEB compliance.

Security hardware is engineered to match the quality of the frames themselves. Multi-point locking is standard, engaging the sash at multiple points around the perimeter simultaneously when the handle is locked. The inherent rigidity of aluminium as a material means the frame maintains its geometry far better under attack than softer frame materials, providing a further layer of security protection.

Powder Coating, Dual Colour & Glass Options

Every aluminium casement window we supply can be powder-coated in any RAL or BS colour. Dual-colour finishes, where the internal and external faces of the frame are finished in different colours, are a popular choice that allows the window to integrate with both the building facade and the interior scheme. The powder coat finish is electrostatically applied and oven-cured to a Class 1 thickness that provides outstanding weather resistance and colour retention for 25 years or more without recoating.

For homeowners and developers looking to specify aluminium windows for a new build or extension project, our technical team can provide CAD drawings, U-value calculations, and specification documents to support your planning and building control submissions. Contact Northern Storm today for expert guidance and a detailed quotation for your project.