How to measure your window

How to measure your window

This is the first of two posts I'll be writing to help you to measure your window and fit your window shutters. The measuring part is definitely the most important one so before writing anything about it I must advise you that it is much safer to get an expert to measure your window because if you get it wrong there’ll certainly be a river of tears. However, it is quite possible to do on your own and you may be able to save a few pounds!

Another important thing is that I don’t intent to write a manual on the subject this is just a guide to help you through the process. First thing to do is to identify the window type and whether it is in a recess or sash.

If it is a recess window follow the steps below:

1. Measure the exact size of the recess height and width in three places as illustrated by the red arrows.

Recess measuring image

2. There are two mounting options for recess windows, inside and outside mount. Once you've decided on it, you have to choose a framing style which is how your shutters are going to be fixed and its width and depth may vary from window to window, so feel free to get in contact if you need further information. These are the ones I use daily at Plantation Shutters Ltd:

Inside mount - Shutters are installed on the inside of the recess opening as shown in diagrams A, B, C, D and E.


Outside mount - For this option shutters are fixed onto the wall outside of the recess opening as shown in diagrams F and G.


If you have a sash window these are the steps you have to follow:

1. Measure the exact width from architrave to architrave in three places and the exact height from architrave to top of sill in three places as illustrated by the red arrows.

Sash window measuring image

2. The same as above, the only difference is that you won't have much choice on the mounting or framing styles.

Sash Mount - Shutters are normally mounted just inside the architrave as shown in diagram H.


If you have any questions just drop me a message and I’ll try to be as helpful as possible. On my next post I'm going to show what you need & how to fit your shutters.

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Customer Reviews

Great communication from beginning to end. Courteous and efficient staff. The Shutters were fitted in very good time and there was no mess left behind. I would recommend them to a friend.

Customer in Twickenham