The 90t and 200t all terrain cranes are scheduled to be delivered from Germany in June.
The hire company has also invested a further £500k on half an acre of land adjacent to its Dagenham HQ to expand its depot.
Emerson is also looking to recruit crane operators, lift supervisors and lorry drivers. Operations director Liam Clancy said: “We are a national business, looking for local skilled individuals to fill the various vacancies on offer. We welcome people from all levels of the trade, and will provide training for anyone if necessary. This is a major investment for the company and will provide a big boost for the local economy.”