From London and the home counties to Cambridge and popular parts of Devon and Cornwall, land values have become the single largest element of wealth, dwarfing household wealth locked up in property and financial savings.

Official figures showed that the UK’s net worth rose by £492bn between 2016 and 2017 to £10.2tn, with the lion’s share of the increase accounted for by a £450bn jump in the value of land.

The rise continues a trend since 2012 that has pushed the average assets held by each Briton to £155,000, up £6,000 from 2016.

The Office for National Statistics said consistent increases in the value of land meant it accounted for 51% of the UK’s net worth in 2016, higher than any other G7 country that produces similar statistics.

In France, which has a land mass twice the size of the UK, land values account for 41% of wealth while in Germany they account for only 26%.

This week several landowners have outlined plans for developments, including the Duke of Westminster’s Grosvenor Group, which said it was taking a growing interest in residential property outside central London.

It said it would build thousands of homes on greenfield sites around Oxford and Cambridge, which are to benefit from Treasury plans to connect the two university towns with a cross-country rail link.

Analysts said much of the increase in land values was in response to Britain’s rising population, which has put pressure on the government to back house builders seeking to develop green field sites and farmland in south-east England and other development hotspots around the country.

The price of farmland can increase by 100 times when developers succeed in persuading ministers to re-designate it for housing. Areas of London that were previously derelict, especially in the east of the capital, have seen huge rises in values as regeneration efforts and improved transport links have fed into property prices.

Commercial property has also enjoyed an upswing in value since Britain’s recovery following the 2008 banking crash, more than offsetting recent declines in much of the retail sector.

The ONS figures go beyond a study last year by Lloyds bank that showed that Britain’s net worth had climbed above £10tn for the first time, but did not single out the value of land.

The steady increase in land values is expected to trigger further calls for a land value tax or new rules allowing local authorities to reap the rise in values by allowing them buy land earmarked for development.

A growing number of thinktanks and politicians support imposing a tax that would take a slice of rising land values.

The Institute for Fiscal Studies has urged the Treasury to develop a scheme, while the Green party co-leader, Caroline Lucas, has tabled a private member’s bill proposing a land value tax. Labour said in its 2017 election manifesto that it would consider a similar tax.

Mark Wadsworth, the head of the Campaign for Land Value Taxation, said: “The minority with a vested interest in high land values will no doubt celebrate higher values, saying that is shows the importance of land to the UK economy.