Finding the Right VELUX Window Size for Your Project

At Condell Ltd, we understand that selecting the perfect VELUX roof window can be overwhelming. With numerous sizes, model codes, and product variations available, it’s essential to choose the right fit for your space. That’s why we’ve put together this comprehensive guide to help simplify your decision-making process.

 
Understanding VELUX Window Sizes

VELUX roof windows are available in a variety of standardized sizes, ensuring consistency across installations. Over the years, VELUX has maintained most of its size dimensions, making it easier for homeowners and professionals to replace or install new windows without extensive modifications.

Below, you’ll find a breakdown of the most common VELUX window sizes:

VELUX Window Size Chart

If you’re unsure about which size to choose, measure your existing window or the structural opening and compare it with the chart above.

 
Replacing an Existing VELUX Window?

If you’re looking to replace an older VELUX window, identifying your current VELUX window code is the first step. The data plate, located on the top edge of your open window, contains essential details such as the model type and size code.

For example:

• A VELUX GGL2 window corresponds to the new MK08 code (78 cm x 140 cm).
• A VELUX GGL4 window should be replaced with the SK06 code (114 cm x 118 cm)

If your model is outdated, you may need custom flashings or alternative solutions. Our team at Condell Ltd is here to assist you in finding the most suitable replacement.

How to Measure for a VELUX Roof Window

Proper measurement is crucial to ensuring a seamless installation. Follow these steps:

• Access the Roof Structure – Use a ladder or scaffolding to safely reach your window area.
• Measure the Width – Take two measurements (top and bottom) and use the smaller of the two.
• Measure the Height – Measure both left and right sides; again, use the smaller value.
• Determine the Roof Pitch – This helps in selecting the right VELUX flashings.
• Record the Data – Use these measurements to select your new VELUX window.

If you need expert advice, Condell Ltd offers professional guidance to help you select the right fit for your project.

 
Structural Opening Sizes for VELUX Windows

When installing a new window, it’s essential to account for the structural opening size, which differs slightly from the external frame dimensions.

VELUX Structural Opening Size Formula:
Height = External Frame Height + 45 mm (Standard) / + 145 mm (for deeper installations)
Width = External Frame Width + 20-30 mm (left & right clearance)

Structural opening sizes vary depending on plasterboard, insulation, and other installation factors. Ensuring accurate measurements can help avoid unnecessary adjustments during installation.

Can’t Find Your VELUX Code?

If you can’t locate your VELUX window size code, don’t worry. Follow these steps:

• Measure the visible glass area inside the window frame.
• Note the dimensions in cm (Width x Height).
• Take a photo of your window and send it to Condell Ltd for assistance.
• Even without an exact external frame measurement, our team can provide guidance on selecting a replacement or alternative solution.

Why Choose VELUX Roof Windows from Condell Ltd?

With a legacy dating back to 1942, VELUX is the leading name in high-quality roof windows. Their extensive range caters to both pitched and flat roofs, providing excellent daylight solutions for all property types.

At Condell Ltd, we supply a full range of VELUX roof windows, flashings, and accessories to help you achieve the best results for your project.

• Wide range of sizes and models
• Energy-efficient glazing options
• Fast and reliable delivery
• Expert advice and support

If you’re ready to find the perfect VELUX roof window, explore our full range at Condell Ltd or contact us today for expert assistance.