Live Chat

Live Chat

10% OFF EVERYTHING in our Spring Sale. 24th - 27th May, 2024. Use code: SPRING24

How to Measure for Bay Window Blinds

Bay window blinds measuring guides


When you measure a bay window for blinds, you will need to take into consideration the depth of the headrail of the blind as well as anything that protrudes from the window such as large window handles or air vents.

Once you have decided on the type of blind you wish to fit into the bay, then check on the chart below and make a note of the size of the headrail depth.

In this Guide:

How to Measure a Square Bay Window for Blinds

Square bay windows are much easier to measure as you will only need to measure the straight sides of the bay.

When ordering blinds for a square or splay bay window, they must be ordered as RECESS blinds.


measuring bay window for blinds


1). Measure out from the window the largest obstruction, then add on the measurement of headrail depth as shown on the coloured HEADRAIL CHART above. Mark the wall or ceiling with this measurement out from Window B. This will give you the fitting position for the blind.

2). Now measure A from where you want your blind to start in the bay to the mark showing the depth the blind will need to be fitted from the wall and make a note.

3). Measure window B and C as shown above, again having marked the wall with the fitting position of the blind before you measure.


Position of bay window blinds

Your blinds should fit in the position as shown above.

How to Measure an Open, Splay Bay or Angled Bay Window for Blinds

For these types of bay windows you will need to create cardboard cut-outs to help to determine the angle of the window.

how to measure blinds for angled bays


3 sided splay bay blind measuring guide


How to measure 5 sided bay blinds


Bay window blinds in 5 sided bays


How to Create Your Cardboard Cut-out

bay window templates

1). First measure the largest of any of the window handles, air vents or other obstructions that the blind will need to clear when it is fitted into the bay and make this measurement A.

2). Refer to the coloured HEAD RAIL CHART below and make a note of the depth of the headrail of the particular blind you have chosen and make this measurement B.

So for example, if you need to allow 3 cms for a particular window handle A. and you have chosen to fit a roller blind that has a headrail depth of 4.8cms B. then the total length of your template will be

A = 3cms + B = 4.8cms which gives a total length of card of 7.8cms.

You will need 2 of these cut-outs

bay window blinds measuring chart

Positioning Your Cardboard Cut-outs

Measuring templates for bays

1). Place the cut-outs in one of the angles of the window with the front tips touching.

2). Mark the point where the tips touch with a pencil.

3). Repeat this step in every angle of the bay.

4). These marks are the position you measure for the size of your bay window blind.

5). When you order your blinds, it is important that you order EXACT blinds.

How To Measure a Closed Splay Bay or Angled Bay Window For Blinds.

1). Measure all the windows as above, apart from the last window each side of the bay which finishes with the wall.

2). Measure each side from the last mark you made with the templates to the start of the wall.

3). Order these last two blinds as RECESS blinds, but all the other blinds as EXACT blinds.

Choosing a Bay Window Blind

Now that you have your bay window measurements and the number of sides, you can decide on the type of blinds you wish to fit in your bay.

Click on the links below to visit our shop to see the various types of blinds that are suitable to fit in straight sided bay window.

Made to Measure Vertical Blinds are the only type of blind that can fit in a curved bay window.

If you have any problems or need extra advice, please do not hesitate to contact us. We have members of our team at Poles & Blinds who have had many years of practical experience in fitting all types of blinds in bay windows.