Ireland actually arguably has a bit of a crisis coming up there; over the last 40 years or so one-off housing (ie rural housing completely in the middle of nowhere, rather than in villages) became more and more common, until the planners clamped down on it. The people living in those houses, which are completely impossible to serve with public transport and utterly dependent on cars, are going to age, and sooner or later it is going to become a serious problem, because once they're unable to drive they'll be trapped in their homes.

It's not a big proportion of housing on a national scale, but still enough that people living in completely isolated houses in more common in Ireland than in most places, and enough that it could become a serious wellbeing problem as the residents age.