It found that levels of household car ownership for private developments were below 100%, even in outer London locations with poor public transport.
It concluded that four in 10 journeys were made by public transport.
St George managing director Tony Carey said: "The high use of public transport indicates that residential schemes can be appropriate in many more parts of London without significant impact on the road network."
The report, undertaken by consultants WSP, Symonds, PFA Consulting and architect Barton Willmore, surveyed 12 private and affordable housing developments in central and outer London.
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