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Measuring Guides For Window Blinds

Use our simple step by step guides and videos to find out how to measure your standard windows, angled bay windows and boxed bay windows. Measuring yourself couldn’t be easier, takes just minutes and will save you money! All our blinds are made with a 5mm manufacturing tolerance (width & drop), this tolerance is seperate to the deduction made for a recess size product.

Standard Window Standard Window Standard
Windows
Angled Window Angled Window Angled Bay
Windows
Bay Window Bay Window Boxed Bay
Windows

Boxed Bay Window Standard Window

If you want your window blind to fit inside, or to hang outside the window recess use our simple step by step guides and videos below to find out how.

Inside window recess measuring video

Outside window recess measuring video

Recess Size

Inside Window Recess

This is the measurement you need to make if the blind needs to fit inside the window recess. Measure the width and the drop in three different positions ensuring you provide us with the smallest measurement.

We will make any necessary deductions to ensure the blind fits neatly within the recess of the window.

Exact Size

Outside Window Recess

An exact size blind is also known as ‘pin width’ or ‘finished blind width’. This is the measurement you need to make if the blind needs to hang outside the recess overlapping the window. Decide how much you wish to overlap the recess at each side, we recommend at least 7.5cm at each side as well as the top and bottom so as to minimise as much external light as possible.

Measure the width and the drop in three different positions ensuring you provide us with the smallest measurement. We will not make any deductions from the measurements provided.

Measuring diagram
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Boxed Bay Window Angled Bay Window

Introduction

Before you start measuring, please select the correct head rail depth from the table on the righttable below. If you have window handles or vents that stick out from the window frame, measure how far these protrude and add this to the head rail depth.

This will be used as the measurement in step 1 below.

Blinds Type Depth (MM)
Aluminium Blind 35mm
Roman Blind 40mm
Pleated Blind 40mm
Roller Blind 50mm
Wooden Blind
(25mm slats)
60mm
Wooden Blind
(27mm slats)
60mm
Wooden Blind
(35mm slats)
60mm
Blinds Type Depth (MM)
Roller Blind
(Face Fix)
70mm
Vertical Blind
(Top Fix)
73mm
Vertical Blind
(Face Fix)
73mm
Wooden Blind
(50mm slats)
80mm
Wooden Blind
(64mm slats)
80mm
Vertical Blind
(Large Face Fix)
91mm
Vertical Blind
(Medium Face Fix)
107mm
1

Cut 2 pieces of cardboard 300mm long and as wide as you calculated above. Remember to account for anything protruding from the window, such as handles.

For example if you want 35mm slats and also need to account for a 30mm protruding handle, you would use a depth of 90mm (60mm + 30mm).

Step 1
2

Slide the two pieces of paper towards each other aling the window sill of the bay until the two corners meet up.

Step 2
3

Using a pencil, make a small mark on the window sill at the point where the paper meets the window frame.

Repeat steps two and three for each corner of your bay window.

Step 3
4

Measure between each set of marks you have made. This will establish the width of the blinds you will need to order.

Step 4
5

To establish your drop, measure from where the top of the blind will sit, down to where you want the blind to stop (normall the window sill).

When ordering the blinds on our website you should order them with an 'exact' measurement type.

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Boxed Bay Window Boxed Bay Window

Introduction

Find the rail depth for your chosen blind using our handy table. Make a note of this before you start measuring.

Choose from the three fitting options. Then measure your bay windows with a metal tape measure, using the instructions for your chosen option.

If your side blinds are going to run up to a wall, deduct 5mm from your final measurements.

Blinds Type Depth (MM)
Aluminium Blind 35mm
Roman Blind 40mm
Pleated Blind 40mm
Roller Blind 50mm
Wooden Blind
(25mm slats)
60mm
Wooden Blind
(27mm slats)
60mm
Wooden Blind
(35mm slats)
60mm
Blinds Type Depth (MM)
Roller Blind
(Face Fix)
70mm
Vertical Blind
(Top Fix)
73mm
Vertical Blind
(Face Fix)
73mm
Wooden Blind
(50mm slats)
80mm
Wooden Blind
(64mm slats)
80mm
Vertical Blind
(Medium Face Fix)
91mm
Vertical Blind
(Large Face Fix)
107mm

Option 1

For this option, the front blind fits from corner to corner, with the side blinds installed up against the front blind. For your front blinds, measurethe full width of the bay then subtract 15mm and choose 'exact fitting' when ordering.

Measure the width of each side blind seperately in the same way tehn deduct the rail depth from each to get your final measurements. The side blinds should then be ordered as 'exact fitting'.

Handles, openers and vents
If you have any obstructions protruding from the front window, measure how far they stick out past the window.

Option 1

Option 2

To make sure this is suitable for your window, check the size of your window frame, going from the corner of the bay to the start of the glass frame pane one the front and then the sides. If any of these measurements are smaller then the rail depth of your blind then your blinds will not cover the glass and there will be noticeable gaps. In this instance, we recommend you consider another fitting option.

In this style all three blinds meet in the corner of the bay without overlapping, creating an empty square space in the corners. Measuring is straight forward, just measure all three sections directly into the corners. Deduct the rail depth form the measurement for each of the side blinds and deduct double the rail depth from the measurement for the front blind. Finally order all as 'exact fitting' blinds.

Handles, openers and vents
Obstructions on the front of the window will reduce the width of the side blinds. Measure how far the obstructions protrudes past the window frame and deduct that from the side blind measurements.

Obstructions on the side windows will reduce the width of the front blind. Measure how far the obstruction protrudes past the side window frame and deduct that from the front blinds measurements.

Option 2a Option 2b

Option 3

If your side windows are too small for the other options, then this will be the most suitable option for you. In this option, the side blinds continue into the corners and the front blind sits between them. Measure the sides into the corner then subtract 15mm, use this measurement to order both as 'exact fit'. Measure across the front then deduct double the rail depth and order as 'exact fitting'.

Handles, openers and vents
Obstructions on the side windows will reduce the width of the front blind. Measure how far the obstruction protrudes past the side window frame and deduct that from the front blinds measurements.

Option 3

Important

Always check the widths in three places as you would for a regular refular recessed window. Bay windows are prone to movement and you may find that the width vary even if at first glance the windows look square. It is always the smallest of the three measurements that you should use.

Drop

This is the same for all three options. It will simply be from the point where the blind is being mounted down to the window sill. Remember that the head rail is included in the drop and that you will need a flat space of at least 50mm (5cm) to mount the brackets securely.

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