The central LFW venue will take up two floors of the venue, with the BFC Show Space and the Designer Showrooms expected to showcase the work of more than 100 designers.
The space will be used for LFW guest registration, and it will also include a photographers’ area and press, buyer and sponsor spaces.
Josef Jammerbund, head of events of the British Fashion Council, told Event: "We are thrilled by this move which will see Brewer Street Car Park transformed into a Central London "Fashion Park" and to embark on this new chapter of London Fashion Week."
Munira Mirza, deputy mayor for education and culture, added: "Brewer Street Car Park as the host venue is a brilliant development for London Fashion Week. With its position in Soho, it is at the heart of an area that has long been associated with fashion and creativity in general. I am sure the move will literally drive even more interest in one of the most important sectors for our economy."
Last year the BFC and British Council used the space to exhibit more than 110 emerging fashion designers from nearly 30 countries as part of the International Fashion Showcase.
London Fashion Week is scheduled to take place between 18-22 September 2015. The provisional schedule will be announced the week commencing 20 July 2015.
The BFC's offices will remain at Somerset House.
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