How to Measure Vertical Blinds
Measuring vertical blinds correctly is essential to ensure a perfect fit for your window or patio doors. Whether you are replacing old blinds or ordering new made-to-measure vertical blinds, taking accurate measurements will ensure the blinds hang properly and provide the best light control and privacy.
Vertical blinds are one of the most popular window coverings in the UK because they are practical, affordable and ideal for large windows and patio doors. Fortunately, measuring for vertical blinds is straightforward and can usually be done in just a few minutes using a tape measure.
Step 1: Decide Inside or Outside Recess
The first step when measuring vertical blinds is deciding whether the blind will fit inside the window recess or outside it.
Inside recess fitting means the blind sits neatly within the window frame. This gives a tidy and modern appearance but requires accurate measurements.
Outside recess fitting means the blind sits above and outside the window frame. This is often used when the window recess is too shallow or when you want to block more light around the edges.
Step 2: Measure the Width
Measure the width of the window recess in three places:
- Top
- Middle
- Bottom
If you are fitting the blind outside the recess, measure the width you want the blind to cover and add around 5–10 cm each side to ensure good coverage.
Step 3: Measure the Drop (Height)
Next measure the drop of the blind from the top of the recess to the window sill.
Again measure in three places:
- Left
- Middle
- Right
If fitting outside the recess, measure from the position where the headrail will be installed down to where you want the slats to finish.
Step 4: Check Slat Width
Most vertical blinds in the UK use 89mm (3.5 inch) slats, which are suitable for the majority of windows and patio doors. Some larger installations use 127mm slats, but these are less common.
If you are replacing existing slats, simply measure the width of one slat to confirm the size.
Measuring Replacement Vertical Blind Slats
If you only need to replace the slats rather than the full blind system, measuring is even easier.
Remove one existing slat and measure the fabric length from the top of the fabric to the bottom hem. Do not include the plastic hanger clip.
You can then order new slats from replacement vertical blind slats to refresh your existing blind without replacing the full track system.
Tips for Accurate Measurements
- Use a metal tape measure rather than a ruler
- Always measure in millimetres for accuracy
- Measure at least twice to confirm the size
- Record both width and drop measurements clearly
Taking the time to measure properly ensures your vertical blinds fit perfectly and operate smoothly. A well-fitted blind will hang evenly, rotate correctly and provide effective light control.
If you are unsure about measuring, it is always best to double-check your measurements before ordering.
Once you have the correct measurements, ordering made-to-measure vertical blinds or replacement slats becomes quick and easy.
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