Buckingham is believed to have fought-off competition from Volker Fitzpatrick to build the 375,000 square foot Common User Facility.
The firm is now mobilising to start construction with the new logistics centre planned for completion in Q1 2015.
DP World Chairman Sultan Ahmed Bin Sulayem said: “This is a highly significant milestone for both DP World London Gateway and London Gateway Logistics Park because it opens the doors for UK importers and exporters both large and small to shorten their supply chains and take advantage of the UK’s most modern port to bring their goods close to the major market of London and the South East.”