VELUX codes
VELUX Window Size Codes in Ireland: How to Find the Right Blind
Every VELUX roof window carries a code that identifies exactly which blind fits it. Reading that code correctly is the single most reliable way to order the right made-to-measure blind first time.
What the VELUX data plate tells you
VELUX fits an identification plate (sometimes called the type sign or data plate) to every roof window. It carries two pieces of information that matter when you are buying a blind: a model prefix and a size code.
The model prefix describes the window itself — how it opens and what it is made from. The size code describes the glass size, and that is the part that decides which blind fits.
Where to find the plate and how to read it
Open the roof window fully and look along the top edge of the sash. The plate is a small silver label printed with the window's details.
Read it only from a safe, stable position, with both feet supported and without stretching or leaning. If the plate cannot be reached or photographed safely, do not try: send us a photo of the window taken from floor level, or contact us and we will identify the size with you.
Prefix and size code: an example of the format
A code such as GGL MK04 shows the format clearly. GGL is the model prefix and MK04 is the size code. Used here purely as an example of how the two parts fit together, it is not a statement about which codes are the most common.
Prefixes you may see include GGL, GGU, GPL, GPU and VELUX's numeric-era equivalents. Size codes are either letter-and-number combinations such as MK04, SK06 or S06, or plain numbers such as 304 on older windows.
Use the printed code, not the measurements
Measuring the glass or the frame yourself is easy to get wrong: trims, seals and the visible glass area all differ from the nominal size the code refers to. Two windows that measure the same at the frame can take different blinds.
Always order to the exact code printed on the plate. If you have measurements but no code, send them to us with a photo rather than assuming a match.
Which codes we make blinds for
Bizzy Blinds makes blinds for a broad range of VELUX size codes — 69 are listed on our VELUX hub, covering both modern letter codes and older numeric ones.
If your code is not one you can find listed, send it to us and we will confirm whether we can make for it before you order. Non-standard windows can be quoted separately.
Common questions
Where do I find my VELUX window code?
On the identification plate along the top edge of the sash, visible when the window is opened fully. Read it only from a safe, stable position, and contact us instead if you cannot reach it safely.
What is the difference between the prefix and the size code?
The prefix (for example GGL or GGU) identifies the window model and material. The size code (for example MK04 or 304) identifies the glass size, and that is what determines which blind fits.
Are the window dimensions enough on their own?
No. Measurements taken at home rarely match the nominal size the code refers to, and similar-looking windows can take different blinds. Order to the code printed on the plate.
What if my code is old or not listed?
We make blinds for 69 listed VELUX size codes, including older numeric ones. If yours is not listed, send it to us and we will confirm whether we can make for it.
How do I get help with my code?
Send your full code or a photo of the identification plate through our contact page, or email info@bizzyblinds.ie, and we will confirm the fit before you order.
Primary sources
- VELUX — type sign (identification plate) — Where the type sign sits on a VELUX roof window and how to read it.
- VELUX — roof window sizes — VELUX's published size range and size-code system.
- VELUX — find product information safely — VELUX's safety guidance for reading product information on a roof window.
Keep exploring
- How to find your VELUX window code
- VELUX blinds — full range
- Shop and configure your blind
- Ask us to confirm your code
VELUX® is a registered trademark of VKR Holding A/S. Bizzy Blinds is an independent supplier of aftermarket blinds compatible with VELUX roof windows and is not affiliated with VELUX.