How to Measure for Shutters Inside Mount

How to: Measure Inside Mounted Shutters


To have an inside mount L Frame shutter you need to have 65mm of unobstructed depth to allow for the blades to operate freely.

Measure 3 points for the width as per the diagram. Windows are rarely square.

Measure 3 points for the drop.

We always use the smallest measurement to ensure the Shutter fits in the reveal.


If the difference between the smallest and largest measurement is greater than 10mm then GetBlindsNow recommend you switch to an Outside Mounted L Frame.


The maximum width a single panel can be is 900mm so based on your width determine how many panels you need. All panels will be equal in size. 3 or more panels will require a T post.


Measure for a midrail if applicable.

This is always measured from the bottom of the window frame up to the center of where the midrail would be.

<1500mm drop = no midrail

1500mm – 2400mm = 1 midrail

2400mm – 3600mm = 2 midrails

If possible, line the midrail up with a natural mullion in the window so the glass is as unobstructed as possible