Why precision is key for roof windows
Skylight blinds are made to fit snugly within your roof windows, keeping out excess light and helping with insulation. Because these blinds need to align perfectly with the frame, accurate measurements are essential. A blind that’s even slightly off can rattle, let in light, or simply not fit at all.
Tools you’ll need before starting
To make the job easier, gather:
- A sturdy metal tape measure
- A pencil for noting down your figures
- A notepad or piece of paper
- A step stool or small ladder if the skylight is high up
Understanding skylight window fittings
Unlike standard blinds, many skylight windows (such as Velux, Fakro, or Keylite) come with an identification plate. This small metal tag, usually found on the window frame, lists the model and size code. Using this code is often the simplest way to order a perfectly sized blind. If your window doesn’t have an ID plate, you’ll need to measure manually.
Step-by-step measuring guide
Here’s how to measure if you can’t locate the size code.
Measuring the width
Measure the visible glass width inside the skylight frame. Be sure to measure as accurately as possible from edge to edge.
Measuring the height
Next, measure the visible glass height from top to bottom, again inside the frame. Record the figure exactly, down to the millimetre.
Double-check your details
It’s worth confirming both your written figures and, if possible, your window’s size code. As the saying goes: measure twice, cut once – it saves headaches later.

Mistakes people often make
Here are some common errors to avoid:
- Forgetting to check the window’s size code when it’s available
- Measuring the outer frame instead of the glass area
- Using a fabric tape that can stretch
- Guessing or rounding figures instead of writing them precisely
Why call in the experts?
While skylight blinds are designed to be straightforward, accuracy really matters. If you’re unsure, it’s best to have a professional take care of it. With Kelly’s Blinds, you’ll get expert measuring and fitting, guaranteeing your skylight blinds look great and perform perfectly.
Next step once you’ve measured
Once you’re confident in your figures, you can start browsing designs. Discover the stylish and practical options available in the Skylight Blinds collection, with choices to suit every room and need.
FAQ – How to Measure Skylight Blinds?
Do I need to measure if my skylight has a size code?
Not usually – the code on the ID plate is enough to match your blind to the window.
What if I can’t find the identification plate?
Simply measure the visible glass width and height inside the frame to the nearest millimetre.
Can one measurement work for all my skylight windows?
No. Each skylight can differ slightly, so always check the code or measure each one individually.


