The house that we own is probably the most expensive thing we have. But the interesting fact and awkward at the same time is that for the vast majority of us, we don’t really know our property’s value. Denis Quayle, Principal at Harcourts Maynard Burgoyne, has a strong view on this issue. “After all, most of us are working off a bond, so we can give a rough-and-ready estimate that pegs our...