GSL uPVC &  Slimline Aluminium Windows are a great addition to the modern living space as current windows might have frames that block natural light from reaching your home.

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We manufacture aluminium slimline windows with durable materials in gorgeous shapes for your home.

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The slimline flush casement window from GSL offers the perfect combination of a flush finish and slim sight-lines. As a result, this window is ideal for contemporary new builds. As well as refurbishment projects, replacing existing slimline timber or even steel windows.