Guide to VELUX Window Sizes

With nearly 80 years’ experience in crafting high-quality roof windows, VELUX combines gorgeous design with innovative technology and industry-leading manufacturing. VELUX Windows transform any space they’re in, whether it’s a hallway or large family kitchen. They add plenty of natural light along with ventilation to make your living space a healthier, more comfortable place to be.

Whether you’re replacing an existing VELUX roof window or installing one for the very first time, finding the perfect size window for your project can be difficult. This is especially true if you’ve never had to shop for a roof window before.

Choosing the right size of window is incredibly important to the aesthetics and comfort of your home.

According to veteran American architect Duo Dickinson, "The power of windows is often most evident when the size, type, or location is miscalculated. Then rooms are either glaringly bright, depressingly dim, or stultifyingly stale."

Thankfully, it couldn’t be simpler to find the perfect size VELUX window for your project. Whether you’re just looking for a small 55x78cm centre pivot or a large 134x140cm top hung window, we’ve got the right VELUX window for you. To give you a helping hand, we’ve got a handy guide to VELUX window sizes below.

How Are Velux Windows Measured?

When selecting your VELUX window, it’s important to know how they’re measured. In most cases, the size given represents the measurement of the external frame and not the glazed area. This should roughly be the size of hole you’ll need in your roof deck, although this can vary when using a flashing kit or insulation collar.

What Are the VELUX Window Size Codes

Below is a chart showing the corresponding code for each size of VELUX window. Each merchant should recognise these codes and be able to point you in the right direction. However, remember that there may be additional characters depending upon the size, frame style, glazing option, and opening type. But the standard code (e.g. BK04) should always be present.

How to Find the Size of Your VELUX Window

If you’re replacing an existing VELUX window and require the same size, it’s easy to find the corresponding code. This is because every window manufactured after 1968 features a helpful plate in the top right-hand corner of the frame with all the key information printed on it. However, because of where the label is, it can’t be seen when your window is closed.

The code you’ll find on this plate shows the size, frame style, glazing and opening type of your VELUX window. In most circumstances this will align with current models, but if not; our customer service team will be able to help find you a suitable replacement window.

Remember, the frame style, glazing option and opening type don’t necessarily need to be the same as the old one if you’re replacing an existing VELUX window. You just need to make sure that the size is still the same. For example, a GGL MK04 3070 could be replaced with a GPL MK04 2066.

Shop VELUX Windows Without a Code

We aim to make buying a VELUX roof window as painless as can be. That’s why we allow you to configure your roof window yourself rather than forcing you to hunt through hundreds of variations. It couldn’t be any simpler!

For example, when you’re viewing a VELUX Centre Pivot Window, you can select the frame colour, window size and window glazing with our easy to use dropdowns. Then, when you add the item to your basket, you’ll see the corresponding code for reference.

Therefore, if you already know the size of the window you want (e.g. 55x98cm), you can just select it from the dropdown on one of our VELUX windows. There’s no need for you to search for and find the code like you would shopping elsewhere.

Help Finding Your VELUX Window Size

If you need any help buying a roof window for your next project, just get in touch with our award-winning customer service team. They’re on-hand to help you via phone on 01295 565 565 or the online chat feature on our website and will help you choose your ideal size VELUX window with the right opening type for you and a gorgeous frame. All while keeping the cost of your project low!