#TuesdayTips - get the perfect window fit

Posted 21 June 2016 by Helen Christie

With so many different options available for your window dressings, replacing them can seem like a daunting task…

David Roebuck, managing director at online blinds and curtains retailer, DirectBlinds.co.uk provides his top tips on how to correctly measure your windows to ensure the perfect fit – meaning all you have to worry about is what design to go for…


Firstly, it’s best to invest in a metal tape measure as cloth tapes aren’t accurate enough, and you will need a pen and paper to record the sizes.

Before you begin look for any possible obstructions to the clear working of your blind, such as inward opening windows, handles or part tiling and make sure you allow for these when deciding upon where you measure. If you would like your blinds to fit inside your window opening this is called a recess measurement.

To measure inside your window recess, follow these steps:

  • Measure the inside width of your window in three places. The narrowest measurement is your recess width.
  • Measure the inside length or drop of your window in three places and -- the shortest measurement is your recess drop.
  • Most blind manufacturers will reduce your recess sizes to ensure the blinds fit within the opening, so it’s important to bear this is mind when measuring.

For blinds that hang outside your window recess, this is referred to as an exact size. For the blinds to fit perfectly make sure to do the following:

  • Measure the width where you want the blind to be, allowing for a 10-15cm overlap each side to work out your exact width.
  • Measure the length where you want the blind to be, again allowing for a 10-15cm overlap but this time for both the top and bottom. This is your exact drop length.
  • For exact measurements, blind manufacturers will make your blinds to these exact overall dimensions and make no allowances!

When measuring roller blinds please note that the cloth or fabric width will be 3cm narrower than the overall exact blind width.


To start with, if you have an existing curtain pole or track make sure you measure the whole width, not just the window opening, being careful not to include the end ornaments in your measurements. For those of you measuring a track with an overlap don’t forget to add it to the end to end width.

If fitting a new track or pole make sure it is approximately 15cm above the window and 20cm wider each side of the opening, so the curtains can draw clear to let more light in.

If you would like your curtains to drop to the floor, measure 1cm from the floor. For curtains touching the window sill, also measure 1cm above. However, for curtains to fall below a window sill measure roughly 20cm below, or if there is a radiator underneath measure 3cm above the top of the radiator.

Finally, to achieve the most accurate measurement always measure in a few places as a lot of tracks, poles and windows aren’t quite level. Use the shortest measurement to avoid the curtains dragging on the floor.

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