However, EH expressed disappointment over Grimshaw's plans to demolish the fourth barrel vault of the station designed by 19th-century engineer Isambard Kingdom Brunel. EH is holding talks over alternative schemes that would retain the vault and restore "key parts of the remaining station".
The proposed redevelopment will open up the station to Paddington canal basin to the east. It follows on from Grimshaw's modernisation of the station's main concourse, completed in 1998.
The scheme will be financed by speculative offices.