Find Your VELUX Window Size Code

When ordering skylight blinds to fit VELUX windows you need to know your VELUX window size code.

This guide describes how you go about finding the code – and what to do if you can’t find it.

Step 1: Finding the VELUX window ID plate.

Start by opening the VELUX window and looking along the edges of the window for a metal plate or sticker as shown in the image below:

VELUX window size code identification plate examples and locations.

Step 2: Finding the VELUX window size code.

There are two parts to the VELUX window code, the window type and the window size. The window type, usually three letters like GGL,GHL,GZL,GGU and so on is not relevant for purchasing blinds for VELUX windows, you don’t need it.

The important part of the code is the window size code, this can be up to 4 characters depending on which year the window was made. For example, windows made pre 1992 have just one or two characters whereas windows made post 2014 have four characters. The image above shows examples of VELUX window identification plates for all years including each type of window size code.

Step 3: Order your Blinds

As long as you can find the VELUX size code you can go ahead and order blinds for your VELUX windows. All our blinds come with quality thermal blackout fabric, solid metal fixings, child safety certification and 3 years warranty as standard. The skylight blinds are extremely easy to fit, check out our fitting instructions video.

Step 4: (Optional) What to do if you cannot find your VELUX window size code.

You may find that the VELUX Identification plate/sticker is not on the window or the information on the ID plate is worn or faded. If this is the case you will need to find out the window size by measuring the visible glass size of the window inside the window frame in millimetres (mm).

Once you have taken the measurements you can compare them to our handy sizing table below to find out your VELUX window size code. This table includes glass size measurements for every VELUX window ever made so if you cannot find your size code here, your window is not manufactured by VELUX. Please either check out our identification guides for other skylight window manufacturers or contact us and we’ll help you identify your window.

VELUX Window Size Code Table: