In mid-April 1941, the Ministry of Aircraft Production informed the Treasury of their intention to build an underground factory of in sandstone hills at Drakelow, Wolverley, near the village of Kinver and the town of Kidderminster, for use by "one of the engine or gun factories in the Coventry or Birmingham area". The cost of the facility was estimated at £285,000. Sir Alexander Gibb & Partners were contracted to supervise the construction, which began in June 1941 with a provisional completion date of 6 July 1942.