Why precision is crucial for blackout blinds
Blackout blinds are all about blocking light effectively – ideal for bedrooms, nurseries, or anywhere you need complete darkness. But for them to do their job properly, the fit has to be just right. Even a small gap at the edges can let light stream in, so careful measuring is the key to getting the best results.
Tools you’ll want to gather
Before you start, make sure you’ve got:
- A sturdy metal tape measure (avoid fabric ones that can sag)
- A pencil to note down your figures
- A notepad or paper for recording each window’s measurements
- A step stool if you’re working on tall windows
Inside or outside the recess – your choice
You’ll need to decide whether to fit your blackout blinds:
- Inside the recess (recess fit): This gives a neat, built-in look but may allow a little light to filter in at the sides.
- Outside the recess (exact fit): This covers the whole recess and overlaps the wall or frame, offering maximum light control – a popular option for blackout blinds.
Your chosen fitting style will guide how you measure.
Step-by-step guide to measuring
Measuring the width
- Recess fit: Take three width measurements inside the recess – top, middle, and bottom. Note them all and use the smallest figure.
- Exact fit: Measure the full window opening, then add an overlap of around 7–10cm on each side to stop light seeping in.
Measuring the drop
- Recess fit: Measure the recess height in three places – left, centre, and right. Use the shortest measurement to avoid snagging.
- Exact fit: Measure from where you want the blind to start above the window down to your preferred end point, adding a little extra for complete coverage.
Double-check your measurements
When it comes to blackout blinds, there’s no room for error – a millimetre out can mean unwanted light. Always follow the rule: measure twice, cut once.
Common mistakes to avoid
Here are a few pitfalls worth steering clear of:
- Measuring only once instead of three times
- Forgetting to allow extra overlap for outside fitting
- Not accounting for obstructions such as handles, tiles, or radiators
- Using a soft measuring tape that may stretch
Why professional measuring makes sense
Blackout blinds need to be precise if they’re going to do their job properly. If you’d prefer peace of mind, leave it to the experts. Kelly’s Blinds offer professional measuring and fitting, ensuring your blackout blinds are perfectly installed for maximum darkness and comfort.
Next step after measuring
Once your figures are ready, it’s time to choose your design. Browse the full range of Blackout Blinds and find the ideal solution for your space – whether it’s for a restful bedroom, a child’s nursery, or a cosy cinema room.
FAQ – How to Measure Blackout Blinds?
Do blackout blinds work better inside or outside the recess?
Outside fitting usually blocks out more light, but recess fitting gives a neater look – it depends on your priority.
How much extra overlap should I allow for outside fitting?
Adding 7–10cm on each side is generally enough to minimise light gaps.
Should I round my figures up or down?
Neither – always record the exact measurement to the nearest millimetre for the best results.
