VELUX is probably the most well known brand for roof windows and skylights here in Ireland.

In 2021, Velux introduced a new coding system for their products, which replaced the previous system.

The new codes provide more information about the product and make it easier for customers to choose the right window for their needs.

Many people who are replacing their roof windows see these old Velux codes and need to know what the corresponding new code is - so that is where we are here to help!

Old Velux Codes

The old Velux codes consisted of a combination of letters and numbers that provided limited information about the product.

The code typically included information about the type of window, the size, and the glazing options.

However, the code did not provide any information about the energy performance or other features of the window.

In the above image you can see the current new model sizes in larger font - e.g.

SK06.

Above that you can see the previous incarnations of the model name for that size.

Old VELUX codes are easy enough to find on the information panel or stamp on each window.

You will probably need to open the window up to see old VELUX codes.

You can measure the window too and call us on 0818 888 000 and we will help identify the right size for you.

New Velux Codes

The new Velux codes are more comprehensive and provide a lot more information about the product compared to old VELUX codes.

The code consists of a combination of letters and numbers and is divided into four sections.

The first section of the code provides information about the type of window, the second section provides information about the size, and the third section provides information about the glazing options.

The fourth section provides information about the energy performance and other features of the window.

Type of Window

The first section of the new code provides information about the type of window.

The new coding system uses two letters to indicate the type of window.

For example, the letters “GG” indicate a roof window with a manual opening mechanism, while the letters “GT” indicate a roof window with a top-hung opening mechanism.

Old Velux codes will probably not have that information included.

Size

The second section of the new code provides information about the size of the window.

The new coding system uses four digits to indicate the size of the window in millimeters.

For example, the code “134x98” indicates a window that is 1340mm wide and 980mm high.

Glazing Options

The third section of the new code provides information about the glazing options.

The new coding system uses a single letter to indicate the type of glazing.

For example, the letter “P” indicates a window with laminated safety glass, while the letter “T” indicates a window with toughened safety glass.

Old Velux codes tended not to have this information.

Energy Performance and Other Features

The fourth section of the new code provides information about the energy performance and other features of the window.

The new coding system uses a combination of letters and numbers to indicate the energy performance of the window.

For example, the letters “70” indicate that the window has a U-value of 1.0 W/m²K and a solar heat gain coefficient (SHGC) of 0.70.

The code may also include letters to indicate other features of the window, such as the type of flashing kit required.

Old Velux codes did not have this information included in it.

The new Velux codes are a significant improvement over the old Velux codes.

They provide more information about the product, making it easier for customers to choose the right window for their needs.

The new codes provide information about the type of window, the size, the glazing options, and the energy performance of the window.

If you are in the market for a Velux window, be sure to familiarize yourself with the new coding system to make an informed decision.