Replacing 250+ VELUX windows/skylights a year, we are still surprised at the age of some windows that we replace that are still functioning as designed even if they no longer meet our ever increasing need for sound and heat insulation.
The chart below shows standard sizes of VELUX pitched roof windows along with their previous size codes.
So looking at the CK01 at 550 x 700, CK01 being the current generations code used for this size you then have older generations including 9, 101 and C01 which are all essentially the same size but from different generations/manufacturing periods.
Your window code will begin with either GGL, GHL, GPL, GGU or GPU, followed by numbers or a combination of letters and numbers.
If the GGL or similar is followed by 1 or 2 numbers you have a window manufactured before 1991.
If the GGL or similar is followed by 3 numbers you have a window manufactured between 1991 and 2001.
If the GGL or similar is followed by 1 letter and 2 numbers you have a window manufactured between 2001 and 2014.
If the GGL or similar is followed by 2 letters and 2 numbers you have a current generation VELUX window manufactured from 2014 onward.
Other models of the same size may have the GGL part replaced with GHL, GPL, GPU etc but are still the same external size.
The only window size from the standard models that has changed is the GGL 5 window, this was originally 70cm wide but all following generations (GGL 206, F06 and FK06) have a width of 66cm.
Can’t see your VELUX code above?
The codes listed above correspond to standard VELUX windows designed for pitched roofs. If your code isn’t included, you may have a different model type, such as vertical elements paired with pitched roof VELUX windows, Balcony and Terrace VELUX windows, or VELUX windows intended for uninhabited loft spaces. To assist you in identifying the correct size code or model type, please provide us with a photo of your window along with its approximate dimensions, and we can typically help determine the necessary information.
What does the GGL, GGU part of the code mean?
The first part of your code determines the operation and internal finish:
- GGL – Centre Pivot Pine
- GGU – Centre Pivot Upvc
- GPL – Top Hung Pine
- GPU – Top Hung Upvc
- GHL – Top Hung Pine pre 2014
- GHU – Top Hung Upvc pre 2014
- FVL/FVA – Pre 1991 split pane window