The 71-year old architect has been asked to revamp and expand the Grade II-listed St Paul's church, in the prestigious Onslow Square area of Chelsea, west London.
The 3,330m 2scheme will effectively double the size of the 19th-century church building, which is currently being used as offices by the client, Holy Trinity Brompton, and turn it into a 'sustainable, modern place of worship'.
A new block, which will replace the existing vicarage and church hall, will provide space for a 'Family Life Centre', a theology college, a café, a bookshop and lecture facilities.
There are also plans for three new residential units for the curate and vergers at the rear of the building, and a roof terrace.
A spokesman for Foster and Partners said the project would 'correspond to the heights of the adjacent residential buildings and create an elegant new addition to the street.'
Foster said: 'We are very excited to be working on the transformation of St Paul's. In refurbishing the building, the challenge is to restructure a 19th-century church to fit contemporary needs.
'The building will combine a sense of history with a reinvigorated 21st-century environment for worship and learning.'