The council said the postponement would allow it to look at detailed responses to representations made since the publication of the planning officer's report.
"This is a large and important scheme for the future of Barnet. I want everyone to appreciate that representations will be dealt with professionally, transparently and in full," said Barnet's planning committee chairwoman Maureen Brown.
The project covers more than 150ha and aims to provide 7,500 homes, train and bus stations, bridges, cycling routes and open space. But it has sparked local opposition centred on concerns over an energy from waste plant and traffic issues. The council will now make a decision on 20 October.