The total equates to £114,000 for every man, woman and child in the UK at the end of 2012, estimates from the Office for National Statistics (ONS) showed.
About 57% of the national wealth is wrapped up in homes, which were worth £4.4trn at the end of last year, up 4% on a year earlier. They have soared in value from £1.2trn in 1992.
The UK's net wealth edged up 1% or about £74 billion on 2011, driven by a £225bn increase in the value of non-financial assets which range from houses and cars to cattle and fine art.
The UK's overall value more than trebled in the 25 years from 1987 to 2012, but the ONS said the gentle increase last year reflected subdued demand from the crisis-hit eurozone and a tough domestic economy.
The combined wealth of households and non-profit organisations such as churches, charities and trade unions was a net £7.6trn, up 6% or £410bn.
More new cars on the road drove up the value of transport equipment by 11% to £208bn.
The ONS also added the value of personalised number plates - worth £2.3bn - to the balance sheet for the first time.
But Britain's ballooning public sector debt and slumping tax revenues depressed the combined value of central and local government further.
The whole government sector was worth minus £305bn at the end of 2012, worse than minus £271bn a year earlier.