Vyners School in Warren Road, Ickenham, will offer an additional 300 secondary school places, and the expansion of Ruislip High School will create 174 extra, it was revealed today.
The existing sports hall at Vyners will be extended to create a new two-storey teaching block of 12 classrooms, dining room, library and special educational needs suite, replacement sports hall storage and administration facilities. A new main school entrance will also be created.
The existing multi-use games area will be replaced and an all weather pitch will be constructed on a section of the school playing field.
The new school building will increase the number of pupils at Vyners School from 1,151 to 1,451, and is expected to be fully completed for the start of the new academic year in September 2019.
Hillingdon Council announced the news this afternoon.
Below is an artist's impression of the Ruislip expansion plans.
The council's investment in Ruislip High School includes a three-storey extension which will provide a main school hall, sixth form centre, eight classrooms, media room, art studio with outside decking and facilities for pupils with physical disabilities.
The existing school building will be remodelled to provide a new activity studio and science laboratory and a covered external recreation courtyard area will also be created, which will include new trees and seating. The work on this site is also expected to be fully completed by September 2019.
Councillor David Simmonds CBE, Hillingdon Council's Cabinet Member for Education and Children's Services, said: "Following our extensive primary school expansion programme, the council also recognises the need to ensure every child is offered a secondary school place as close to their home as possible. Our secondary school expansion programme will continue to create new places and high quality facilities so our young people can receive the best education."
The expansion work is part of the council's £260 million primary and secondary school building programme, which it said was "one of the largest in London".