The project involves building the visitor centre outside of the facilities perimeter in Llantrisant.
A dedicated car park and a footbridge over a river to link the car park with the visitors centre will also be developed.
The single-storey steel frame building will aim to achieve a BREEAM 'Very Good' environmental rating.
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It is to include a large interactive exhibition space, along with a visitor cafe, including a full catering kitchen and classroom space for visiting school parties.
Jon James, ISG's Western regional director, said: "The Royal Mint is the UK's oldest manufacturer and currently produces currency for around 60 countries. The visitor centre will provide an opportunity for visitors to see a coin minting operation of world renown.
"The project is not only prestigious, it is also a complex scheme spread across two sites with both environmental and aesthetic considerations, further strengthening ISG's strong presence in Wales and our track record for delivering iconic buildings."
(LM)
