Commuting costs are, for many people, one of their biggest outlays after housing.
Yes, of course the two are distinct. But a much more useful way of thinking about it is that commuting and houses are part of the same set of costs.
I think it\’s Mark Wadsworth who makes this point. Even done some calcs showing how well it works. Around London, certainly, housing prices fall as a function of commuting costs into the centre. Housing plus commuting costs (using commuting costs as being equivalent to that amount extra on mortgage payments each year) seem fairly static.
No, it doesn\’t work perfectly, Mayfair skews things etc. But well enough that a useful rule of thumb would be to use commuting and housing costs as two facets of the same overall cost.