In Australia, even after the global financial crisis, it's still common to only have 5-10% and some people even use other assets as collateral to borrow all 100%. I hear historically this has not been the case, it's only been the last decade of so during the housing boom.
In terms of avoiding risk and stuff, what do you think is a sensible percentage? Or is that even a relevant measure? Should people be looking at say, income?