By 1995 there were still about one million households in negative equity - worth a total of £5billion - and around 1,000 homes were repossessed every week.
However, between 1996 and 1998 prices recovered to their 1989 levels. They then continued to rise in double-figure percentages until 2001, by which time London prices were up 130 per cent compared with early 1996.
Capital Economics expects prices to fall from today's peak levels by 20 per cent in 2007.
"Given that average house prices also fell by 20 per cent over the three and a half years from their peak in 1989 to their trough in 1993, it is not improbable that negative equity could reach its previous peaks," said Mr Bootle.
If house prices start to fall in April 2004, only those who have taken out a mortgage after April 2002 run the risk of going into negative equity. This is because any homeowners buying before this date have seen the value of their houses increase by more than 20 per cent.
"The South-East will have the highest number of households in negative equity," Mr Bootle said. More than 50,000 first-time buyers, including many key workers, are at risk.
The warnings come as figures show that over the past 12 months, London prices have fallen on average by 1.53 per cent.
Price monitor Hometrack found that 14 boroughs had price rises over the past year, but in 19 boroughs prices fell.