I was wondering the same thing.. I have a peninsula with an overhang and a wall behind that.. there is 30 inches clearance, and I have backless stools tucked underneath. Would love to get stools that have a back (as opposed to the backless I have now) but dimensions are definitely a factor for function. Is there a universal clearance between a wall and a chair space?

Here is a post from a few years ago that should be helpful...

[https://www.houzz.com/discussions/what-is-the-design-rule-for-spacing-betw-dsvw-vd~74245?n=2[(https://www.houzz.com/discussions/what-is-the-design-rule-for-spacing-betw-dsvw-vd~74245?n=2)