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I have a rectangular polygon I want to create another polygon that is 200 metres bigger in each direction from the original.

Is there a way to create a square buffer around the original polygon or another method to do this?

2 Answers 2

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Use the "Miter" Join style.

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Result:

enter image description here

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  • 3
    For extra info : this is only available for QGIS 3.X. There's no options as this one in the buffer tool of QGIS 2.18.
    – gisnside
    Feb 8, 2019 at 13:39
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I recently wanted to do the same thing as the OP, but rather than irregular-shaped buffers of irregular polygons, I wanted actual squares. Here is an approach I used in QGIS 3.16, I hope it might be useful for others:

  1. Create polygon centroids
  2. Buffer centroid points by desired distance.
  3. Use the 'Bounding boxes' tool in the Processing tool box

enter image description here

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