More than a third of people would not be able to pick their neighbours out of a line-up, a poll suggests.
Thirty-six per cent of people claim they would not recognise their neighbours in person, figures show.
Despite often living just a few metres away, 51% of people cannot recall the first name of their neighbour and seven in 10 are unaware of their full names, according to the Churchill home insurance survey.
The poll of 2,000 adults from across the UK also found that many people don't know what their neighbours do for a living, whether or not they have children or pets, or how long they had lived next door.
Martin Scott, head of Churchill home insurance, said: "Relationships with our neighbours have changed significantly over the years because the way we live, work and socialise has evolved. We move homes more frequently, spend a lot less time communicating face to face and are more cautious about who we welcome into our homes. As a result, we know very little about our neighbours, as we all get on with our own busy lives.
"The lack of trust and familiarity between neighbours does have implications. People may be less willing and less able to watch out for each other - realising there is a stranger on a neighbour's property is very difficult if we cannot recognise the person who lives there."