Step 1: Measure the Window
Printable Worksheet
Printable Worksheet

First decide whether you want the blind to hang inside or outside the recess.



  • Measure the drop from the top of the recess to the window sill in 3 places (each side and the middle). Take the shortest measurement as your finished blind length.


  • Measure the width of the window recess in 3 places and use the shortest width as your measurement. This will give you the finished blind width.


  • Decide what would be the ideal depth for your blind when it is pulled up. (Top Section Size)
  • Approx 15cm is a popular top section size for normal sized windows.



  • Decide where the batten/headrail that will support the blind will be fixed above the window recess. Mark the position of the top of the batten/headrail and measure down to the sill (or where you want your blind to finish). This will give you the finished blind length.


  1. We normally fix approx 10cm to 15cm above the recess.
  2. Make sure the blind will cover the top of the window when pulled up.
  3. Ideally we measure down to 2cm below the sill if the blind can clear it. If the sill is pertruding and the blind can't clear it, measure down to the sill.


There are 3 options for the finished width of the blind outside the recess.

  • If the window has an architrave surround measure the width of the architrave at its widest point and add 1cm.
  • If there is a window sill measure the width of the window sill and add 1cm.
  • If there is no architrave meaure the width of the opening at its widest point. Add 12cm to give the finished blind a 6cm overlap each side.

Choose one of these 3 options and measure to get your finished blind width.


  • Decide what would be the ideal depth for your blind when it is pulled up. (Top Section Size)


  1. Consider the best pattern placement when the blind is up when deciding the your Top Section Size
  2. If you are making a blind OUTSIDE the recess you may be able to adjust the length and width of your blind so it finishes in the best place on the pattern

Questions & Comments


Hi...Your tutorials are amazing. I was trying to watch the joining patterned fabric video but it says it can't be watched due to privacy settings but there didn't seem to be a vimeo link either. Is there another way to access the video?


Which page is the video on? You do have to pay to unlock some of the videos. There is an article on the site showing how to join patterned fabric with a free video HERE


hi there i am about to purchase some material with a lobster pattern on it. unfortunately the fabric width is 2cm too narrow, not including the turnings that i also need to add. Therefore, i will need to join two pieces together and pattern match it. I am just wondering where it is best to do this. in the middle of the blind or at the edge where the fabric runs out and needs joining to the next piece? hope you can advise. thank you


Hi Gillian

This is quite a common problem with blinds that are between 127cm and 130 cm.

Blinds always have central panel with joins on either side. NEVER join in the middle.

This would mean that you would need a tiny sliver of fabric on either side to achieve your desired width. In this situation I would add a contrast border of plain fabric.

If you blind is outside the recess, maybe consider going inside to avoid the xtra width.

Hope these suggestions help.

Kindest regards

Cindy Taylor

Julie Stowe

In the past I’ve used your excellent tutorials and videos to make Roman blinds and Triple-pleat curtains.

I meant to purchase the SewHelpful tutorial for lined Roman blinds again but selected the wrong one and selected Roman blinds with black out lining. Can I use the latter but make some small amendments to hems etc or will I need to purchase a new tutorial? Thank you!


Please see your email


Great video’s thank you, I would be lost without them!

Please can you kindly advise if it is possible to use bonded interlining in either direction in order to avoid joining the interlining in a larger Roman blind. If it’s not possible, where would you recommend the best place to make the join. Thanking you in advance.


Yes you can do that.

Tania P

Hello. Thank you for so much for such detailed, professional tutorials. I used one of them to make a pair of triple pleat lined curtains a few years ago - they turned out very nicely! I am now planning to make a couple of Roman blinds and have a question about the kit.

My finished blind width will be 152.5 cm. I am planning to use a headrail kit from Merrick & Day, which comes in standard widths. The size nearest to my blind's width is 150 cm and the next one up is 180 cm. Can I get away with using the 150 cm wide kit or do I need to buy the 180 cm one and cut it to size? Just seems such a waste...


We would buy the 180cm and cut it down.

Tania P

Thank you!

Glennis Lingard

I like a very dark bedroom - I've looked at all your comments regarding backout interlining etc. If you hang a roman blind outside the recess (so I can put things on the window sill) would the blind then be hanging away from the wall so that you get light seepage around the edge. Would it be 'darker' to hang the blind inside the recess?


You will get more light seepage around the roman blind if you mount it outside the recess. You will still also get some light seepage around the blind though even if mounted inside the recess.

If you really want to black the room out you need floor length blackout curtains returned to the wall covered with a pelmet.

blackout curtains

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