The project is being overseen by London Connects, a joint venture between the Association of London Government and the Greater London Authority, and will involve a coordinated approach on the part of all of London's major public services.
This will include, among others, all the London boroughs, London Voluntary Services Council, The London Fire and Emergency Planning Authority and the NHS.
Nykris, which specialises in website design, will work with System Associates, an internet technology company, on the new portal, which is expected to launch in April next year.
Livingstone said: "I look forward to the London portal delivering real benefits to the thousands of Londoners who now look on the web for public services. Whether it is to find your nearest GP or post office, work out who has towed your car or submit a permit application, the portal will quickly guide you to the right page on the right agency's website."
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