How to get your replacement VELUX right...

Posted by Rory McAinsh on 14th November 2024

Unsure on what you're looking for?

We’ll guide the way…

Replacing an existing window?

The best way for you to tell the exact equivalent size to your existing window is by checking the code on the top of the sash. This might say for example “GGL 304 3059”.

GGL Indicates the variant of window, the 304 indicates the size of the window.

The VELUX catalog shows the equivalents to old window codes at the back page, which you can view here.

From looking at this page above, this shows that the current equivalent to a “GGL 304 3059” is now a “GGL MK04 2070”

The differences with VELUX codes

VELUX Use GGL, GGU, GPL & GPU now.

GGL - Centre Pivot, White Painted Pine Internal finish

GGU - Centre Pivot, White Polyurethane/Maintenance Free Internal Finish

GPL - Top Hung, White Painted Pine Internal Finish

GPU- Top Hung, White Polyurethane/Maintenance Free Internal Finish

The below image shows centre-pivot operation

The below image shows top-hung operation







VELUX pitched roof windows now come with 2 main interior finishes.

The two finishes are shown below:

White Painted Pine

White Polyurethane / Maintenance Free


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