Last year 3.4 million people aged 20-34 lived with their parents, the ONS has estimated

A million more young adults are living with their parents than 15 years ago, official statistics show.

High rents and house prices mean that a quarter of those aged 20 to 34, about 3.4 million people, were still in their family home last year. That figure was 2.7 million in 2008 and 2.4 million in 2003.

The data, published by the Office for National Statistics, will increase pressure on the government to address the shortage of affordable starter homes.

The number of homes being built has failed to keep pace with population growth and the growing trend of people living alone. The government has a target of 300,000 more homes a year, but the present rate is just over 220,000.

Average house prices in Britain