Measuring for Blinds

First of all, decide where you want to position your blind, either within the window recess, or outside it. Make sure you always use a steel measuring tape as cloth tapes are not accurate.

Outside the Recess

1. Measure the width of the window, at the top, middle and bottom. Take the largest of these measurements, and add approximately 120mm (5 in), so that the blind will overlap the window and prevent any light leaking in.
2. Measure the height of the window, at the left, middle and right. Take the largest of these measurements, making sure you have measured to where you would like the blind to extend to. You will also need to add on the amount needed to mount the blind, which will be at least 50mm (2 in).

Within the Recess

1. Measure the width of the window, at the top, middle and bottom of the recess. Note down the smallest of these measurements.
2. Measure the height of the window, at the left, middle and right of the recess. Use the largest of these measurements (except for vertical blinds, where you should use the smallest).