He first started worked part time for the East Anglian Air Ambulance Service in 2015.
The Duke of Cambridge is now a helicopter pilot for the East Anglian Air Ambulance.
Prince William is set to give up his job as an Air Ambulance pilot to take on royal duties full time as the Queen scales down her activities.
As Prince William and his family move to London, Prince George will start school in the capital - the family is reportedly considering Wetherby Pre-Preparatory School in Notting Hill which William and his brother Prince Harry attended - while Princess Charlotte will attend nursery.
Last year, he spent just 80 days on official engagements, while in comparison, Prince Philip, 95, carried out official meetings and visits on 110 days of the year.
Prince William began his job as a part-time pilot for the East Anglian Air Ambulance Service in 2015.
Like Prince Charles and the Princess Royal, William already carries out investitures at Buckingham Palace and Windsor Castle on behalf of the Queen.
Prince William will take on additional royal duties as the queen, the longest reigning monarch in British history, takes a step back because of her health.
A source told the Sunday Times that William would "take on much more work in his areas of interest, including homelessness, cyber-bullying, conservation and supporting vulnerable young people".
Instead they will permanently relocate to their apartment at Kensington Palace and, as HELLO! previously reported, the couple are said to be considering several London schools for Prince George.
Both the Duchess of Cambridge and Prince Harry are also expected to step up their roles this year.
Buckingham Palace announced last month that the Queen has relinquished 25 of her patronages to other members of the royal family.
While a royal source has revealed Prince William has been under "no pressure" to increase his royal duties, "he knew there would come a point where this would be his life for ever more".