Yeah well you can imagine it would be a problem if I built a 20 story shed in my suburban backyard.

Indeed. I have a much harder time imagining the problem if you built one that was, say, an 11ft cube.

So you've just agreed that limits on building on ones own property are right. Say again what the issue is you're trying to object to?

This is the same sort of mindless gotcha as asking someone who thinks it should be legal to own a pistol whether they think private nuclear weapons should be legal.