Inside a double fence, Barnham was roughly pentagonal in layout. There were three main buildings, each surrounded by an earthwork banking. These stored and maintained the bomb casings and the high-explosive elements of the weapons. Additionally, there were 55 small storage buildings, called 'hutches', that held the fissile cores. Today, the two remaining main buildings (one burnt down in the 80s) and the ancillary buildings are used for light industry. The double fence, guard towers and hutches have been maintained and where possible restored, as part of the obligation to historic monument status. Three of the four guard towers have been restored to their original condition, as have a couple of the hutches which have had the inner storage safes replaced. Much of the work has been done by the firms who rent space within the site.
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