How To Identify Your Velux Roof Window
- Milestone Roof Lift and Loft Conversions
- May 19
- 4 min read
Identifying your Velux roof window is crucial—especially for maintenance or replacement. This guide will help you locate the data plates, decode the information provided, and understand how this knowledge benefits both you and your certified Velux installer.

Understanding the Importance of the Data Plate
The data plate is a small, rectangular sticker or metal plate typically found at the top of your Velux window. You can see it clearly when the window is fully opened. This plate holds vital information that helps identify the specific model and installation requirements of your window.
Understanding the information on the data plate is crucial for several reasons. Without this essential data, we would lack vital insights such as:
Size: Knowing the exact dimensions helps in selecting the right replacement parts or products.
Glazing: Information about the type of glazing is necessary to ensure proper insulation and energy efficiency.
Internal Finish: Details about the internal finish allow for better compatibility with your existing decor and functionality.
For example, remember that 70% of homeowners faced challenges during replacement or maintenance mainly because they didn't have this information. Knowing the details from your Velux data plate can streamline your inquiries, ensuring you receive efficient and effective service.
Locating the Data Plate
To find the data plate, open your Velux window completely. Then, look near the hinges at the top of the window frame. While the location may slightly differ depending on the model, this area is generally where the plate is located.
Make sure the view is unobstructed by blinds or curtains. You might need a flashlight to illuminate the space for better visibility.
Pro Tip
If your Velux window has been in place for several years, you may want to check for any dirt or dust accumulation in the area before starting your search.

Decoding the Data Plate Information
After locating the data plate, you will see various lines of text and codes. Here’s what each part means:
1. Model Number
The model number is critical. For instance, a model number like "GGL MK08 2070" directly identifies the window's specific type. This is invaluable when determining specs or making requests for parts or services.
2. Size Code
The size code, like 78x98 cm, indicates a window's dimensions and is essential for ordering a properly fitting replacement. For example, the size of a Velux Window can be identified from the 'MK08' section, with other codes such as 'CK02' or 'FK04' also applicable.
3. Glazing and Additional Features
Understanding Glazing and Additional Features
The final parts of the code provide valuable information about glazing and additional features. For instance, let's consider the example model number '2070'.
Internal Finish: The first part of the number, '20', indicates the type of internal finish.
Glazing: The second part of the number, '70', specifies the glazing characteristics.
This structured approach allows for easy identification of key features associated with the model.
4. Production Date
The production date of your Velux window indicates its manufacturing year. For instance, a window made in 2015 may lack the energy-saving features found in newer models, which can enhance efficiency by 30%.
While knowing the production date isn't necessary for your window replacement, it helps us gauge the age of the existing framework and determine the scope of work.
5. Certification Marks
Look for certification marks indicating adherence to safety and quality standards. For example, compliance with EN 14351-1 means your window meets essential performance standards, which is crucial if you're considering repairs or upgrades.
6. Other Information
If there are additional technical specifications in their window code, please include any characters that indicate features such as solar power or electric operation, distinguishing them from standard manually operated windows.

Take Photos for Reference
Once you examine the data plate, it’s a good practice to take clear photos of both the window and the data plate. This information is essential for us to provide accurate guidance tailored to your needs.
When you reach out, include images from various angles as well as close-ups. The clearer the images, the more effective we can be in assisting you.
Why Contact Us?
As certified Velux installers, we specialize in fitting and replacing Velux roof windows throughout Sheffield, North Yorkshire, Yorkshire, and Scunthorpe. Our expert team is here to help you identify your window, assess compatibility for replacement or repair, and offer solutions tailored to your needs.
Whether you are planning a roof lift, a loft conversion, or simply need to replace your Velux window, contacting us is the first step toward achieving your vision.
What Information to Include in Your Inquiry
When you contact us, providing details can ease the process. Here are key pieces of information to include:
Clear photos of your Velux window and data plate
Concise descriptions of any issues you may be experiencing
Specific questions or preferences related to installation or replacement
The more detail you provide, the better equipped we will be to help you effectively.
Final Thoughts
Identifying your Velux roof window via its data plate is crucial for maintenance and effective communication. When replacing or installing a new Velux window, use this information to ensure quality service.
Our certified Velux installers are ready to help with any inquiries—big or small. Don’t forget to include important photos when you reach out!
By following these steps, you can easily identify your Velux window and understand your installation. For further assistance, contact us today!
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