• Beautiful and Modern

    Allstyle Flush Aluminium Windows

    Our exclusive Allstyle Flush aluminium window system has a minimal external appearance that suits period and contemporary homes.

Aluminium Window Systems

Flush or Standard

Aluminium windows are virtually maintenance free and offer a quality, durable solution that is available in many different styles. Our windows come with the latest high security locking systems as standard. They are designed to reduce heat loss by the use of a thermally broken aluminium frame with a polyamide bridge. Aluminium windows are strong, durable and have minimal sightlines, making them the premier choice for your next project.

Our affordable aluminium windows are highly resistant to corrosion and rust whilst offering strength and durability. A Northern Aluminium window is maintenance free, built to last and above all, a premium product.  Aluminium is extremely recyclable and very environmentally friendly – it’s lifespan is measured in decades instead of just years.

Aluminium Windows also allow you to have your windows coloured in any of over 200 different RAL colours.  It is even possible to have your windows manufactured to have alternate colours on the inside and out.  All our products are painted in a polyester powder coat finish, which is renowned for not fading or flaking.


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Over 200 Colours Available

Windows can be supplied powder coated white or to any RAL colour with most finishes available in matt or gloss finishes. Dual colour finishes are also available offering one colour outside with another colour inside.


Window Profile Styles

Windows profiles are available in flat, chamfered or ovolo profiles and can be supplied externally or internally beaded. High security shoot bolt locking is standard to all opening side hung or top hung sashes.



Our exclusive slim frame extender increases the depth of the standard 53mm outer frame to 70mm and offers the option of using either the ovolo sash profile to produce a flush sash and frame or a flat sash profile to produce a recessed style. The frame extender can also be specified on the bottom of the window to provide a 9mm drainage cill which is especially useful when windows are being fitted above stone cills.


Concealed Trickle Ventilation

Our aluminium windows are now available with an exclusive outer frame head extension that provides integrated night ventilation so there are no visible trickle vents spoiling the slim sightlines of the products.

This new unique profile also provides a weather bar feature to the top of the window further enhancing the performance of the product.

Tel: 01772 455384 | Email: sales@21stnorthernaluminium.co.uk | Or click to