Children's charity Shaftesbury Homes & Arethusa has begun work on a "ground-breaking" contract to provide services for young people leaving care in the London borough of Islington.
The contract includes case management responsibility for 16 and 17 year-olds in the area, which according to the charity, is the first time a local authority has devolved this responsibility to a voluntary sector organisation.
In all previous local authority contracts, while supervision for children has been transferred, responsibility for individual cases has been retained by the local authority as "corporate parent".
Shaftesbury has also won the contract from NCH to provide services for young people in the borough up to the age of 21.
"We will be social worker and young person's adviser," said the charity's head of social work Chris Carey, adding that the arrangements were responding to a demand for a "seamless service" from young people in the borough.