Media 10, which also owns Grand Designs Live, will take over ownership and is responsible for staging the show in March 2010 at Earls Court.
"We see this acquisition as being perfectly timed - when consumer confidence appears to be increasing and with interest rates at an all time low," said Media 10 managing director Lee Newton.
"In my opinion the clever money is being used to buy property at this moment - similarly I believe that clever money in exhibitions is also in this market."
The Ideal Home Show attracts more than 250,000 visitors every year.
The first ever show, then known as the Ideal Home Exhibition was opened by the Lord Mayor of London at Olympia in 1908. It took more than 3000 men a week to build the first exhibition and at a time when only 10% of the population owned their own homes.
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