I agree that including building regulations in the constitution is overkill, and I also that a simple majority to change the constitution would be stupid, however the Swiss require a double majority, which is quite sensible.
You are quite correct "rule by the people" is the heart of democracy, but tyranny of the majority and suppression of the minority are not. The minority are people too, no? That is where the double majority comes in, if a majority of the population had voted yes, but a majority of the cantons(with a minority of the population) had voted no, then the referendum would not have been passed.
In Australia, there have been referendums that would have been passed had a simple majority been required, but a majority of states decided that the change would be a violation of their rights so they stopped it. Minority rights and rule by the people go hand in hand.
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