We know that everything has a price: no, not that you can buy any and everything, rather, that whatever it is that is done there is a price to that being done. Good old Bastiat and what is unseen and all that. And of course, this applies to planning laws just as much as anything else. The difficult thing is trying to work out what those unseen costs are, not their mere existence.
So, here is some research showing what the costs are of the planning laws that we impose upon supermarkets: