Curved Bay Window

Measuring for a curved bay is similar to measuring for an angled bay except you have more sides to measure. Shutters on curved bay windows are fitted in their own individual L frames. Picture 1 below shows a seven sided curved bay window.


  1. Print off an outline profile of your chosen L frame, butt the L frames against one another marking the outside of the frame on the window board.
  2. Our seven sided window below had protruding handles and the chosen louver¬† size was 3 1/2″ so this meant we had to space out our sample frames when measuring (Picture 2). In this instance the handles protruded 1 1/2″ from the face of the window and we allowed a further 5/8″ for louver rotation, so our frames were spaced out 2″ from the window.
  3. Small marks on the window board indicate where to measure to and from (Picture 3).
  4. Record your measurements with a reference on each window, eg. bay 1, bay 2 and so on.
  5. Remember to keep whatever it was you used for a spacer or alternatively make note of how far out the frame samples were from the face of the window when measuring took place. You will need to know this when it comes to fitting.

Fig 1.

Fig 2.

Fig 3.


  1. Measure the height at each curve of the window as this may vary from one side of the window to the other. Record the smallest measurement.
  2. All frames should be the same height as this ensures the same number of louvers will be in each panel and the top and bottom rails will be the same size.

If you need any assistance when measuring your curved bay window, please contact us on 917-284-9425.