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Measuring Guide for Roller blinds in a Square Angled/Box Bay window

With Blinds4You, measuring for your beautiful new blind is easy. Just follow this step-by-step guide, taking care to double check as you go and look out for some handy tips to help you save time too. Below is a handy guide for measuring for Roller blinds in a Square Angled/Box Bay winow.

This guide works for:
Roller blinds

Electric roller blinds

Day & Night roller blinds

First a disclaimer – Roller blinds and Day & Night blinds are not the best option for a square angled window bay because of the gaps in fabric left by the control mechanism.

Before you start measuring, decide how you are going to fit your blinds. There are three options available as shown below. You will need to top or face fix these so please allow for the bracket size: Top-Fixing 50mm or Face-Fixing 70mm.

Option 1

Option 2

Option 3

Measuring the width


Option 1

This is the typical solution for a Square Angled Bay Window.

The front blind runs almost corner to corner, the side blinds are then fitted up to the front blind. Measure the front blind as you would with a standard inside recess blind taking three measurements and choosing the smallest of the three. Order this blind as Recess fitting.

Measure the side blinds’ width deducting the bracket size 50mm for Top-Fix/70mm for Face-Fix (see page 1) to allow for the front blind and the fitting brackets. Measure both individually as windows may be slightly different. Order these blinds as Exact “Bracket to Bracket” fitting option.




Handy Tip: If any obstacles such as window handles might impact the front blind, make sure you deduct the clearance distance from your side blinds too.

Option 2

This option is the professional’s choice but requires the window frames in the corner to be big enough to prevent gaps. Measure the window frame from corner to glass. If either side measures less than 70mm you need to choose option 1 or 3 instead. Otherwise, you might not cover the glass with your blind.

Measure the width of side blinds from recess edge into the corner then deduct the bracket allowance of 30mm. Measure from corner to corner and deduct the bracket allowance of 50mm for Top-Fix/70mm for Face-Fix (see page 1) for the front blind. Order all three blinds as Exact “Bracket to Bracket” fitting option.


Option 3

If your side windows are too small you might need to choose this option. Measure the side windows from recess edge into the corner and order each side blind as Recess fitting. The front blind should be measured from corner to corner and deduct the bracket allowance (see page 1) of 100mm for Top-Fix/140mm for Face-Fix. Order this blind as Recess fitting also.




Handy Tip: Follow the same principle as for Standard windows and measure in three places top, middle and bottom – taking the smallest measurement.

Measuring the drop

The drop can be measured as normal – again in three places. Be aware of how you are fitting the blinds so you know where the top is to measure down from.

Obstructions - window handles etc.

Avoiding obstacles such as handles or vents that protrude from the window frame can be done by reverse rolling the blinds. On a clean surface, you can roll out the full length of the drop until you can see the roller barrel, then flip the fabric over the other “side” of the barrel. This will let the blind fall away from the obstacles.

Once you have noted your measurements, enter the sizes into We will make your new blind to your sizes and send them out to you ready to fit.