How to measure vertical blinds

Choose an option below

Inside reccess measurement

Outside reccess measurement

  • First, take three measurements across the inside of the window recess, at the top, the middle and the bottom of the window.
  • Then take three measurements down, at the left, the right and in the centre of the window, as shown in the picture.
  • Select ‘Recess Size’ in the option box when ordering and supply us with the narrowest measurement across and the shortest measurement down.

Important note

Please do not make any allowance yourself.


Please be aware when ordering Inside Recess Fit Vertical Blinds that:

If you select ‘Recess Size’, a necessary adjustment will be deducted for clearance and your finished blind size will be slightly smaller than the recess size given, to allow the blind to fit and work properly inside the recess and any restrictions.

Vertical blinds are not recommended inside the recess if the recess is less than 130mm/5” deep - if this is the case it would be better, where possible, to mount the blind outside the recess.


When ordering vertical blinds for a recess fit it is necessary to specify that ‘Top Fix’ brackets are required

Tips for measuring

  • Use a metal tape measure - fabric ones can stretch and give an inaccurate reading.
  • Measure at the position where your blind will be fitted to clear all window catches etc.
  • Measure within any tiles or other limitations inside the recess which may affect the finished working width of the blind.
  • Measure in centimetres and round each measurement to the nearest 0.1cm.
  • Measure all windows individually even if they look the same size.
  • The blind should extends at least 7–10 cm to each side of the window recess and approximately 7 to 10cm above and below to ensure that the blind gives adequate coverage of the window when closed.
  • If the window sill protrudes more than 5cms from the recess, the blind may have to stop at sill level rather than dropping below it, as this will obstruct the smooth operation of the blind.
  • Make a note of the new calculated measurement select ‘Actual Size’ in the option box when ordering. This will be the exact size that your finished blind will be made to.

Important note

Please be aware when ordering Outside Recess Fit Vertical Blinds that:

If you select ‘Actual Blind Size’, the measurements you give will be the exact finished size of your blind (within a 5 mm tolerance) with no further adjustment deducted. This provides you with the opportunity to specify a particular size for your blind.

When ordering vertical blinds for an outside recess fit it is necessary to specify that ‘Face Fix’ brackets are required.

Tips for measuring

  • Use a metal tape measure - fabric ones can stretch and give an inaccurate reading.
  • Measure in centimetres and round each measurement to the nearest 0.1cm.
  • Measure all windows individually even if they look the same size.