The confectionery factory adjoining Cadbury World in Dunedin, New Zealand, is to be redeveloped as a tourist attraction.
350 employees could lose their jobs when production is moved to Australia.
Cadbury owner, Mondelez International, plans to expand Cadbury World into the 149-year old building.
The $3 million dollar project will make the attraction six times bigger. In its present form, Cadbury World attracts around 110,000 visitors a year. Mondelez hopes the new expanded version will boost that figure to 180,000.
Plans for the new site include a glass elevator, chocolate making displays, holograms and a chocolate waterfall.
Mondelez has reportedly suggested that some factory employees may be offered employment in the new Cadbury World.