CalMac Ferries will provide these services for the next six years under the new contract, which is worth £43m over the next 12 months.
This is the second major ferry project completed by D&W for the Scottish Government, the first being the six-year contract awarded last summer to Northlink Ferry Services for the services to the Northern Isles.
D&W was able to combine its public sector project experience with a depth of expertise in the shipping and harbour operations sectors.
Teddy Davidson, who led the D&W team advising on the deal, said: "The Clyde and Hebrides ferry services are a vital link to the mainland for the island communities they serve, so we're very pleased to have been able to apply a wide range of skills to secure this important part of Scotland's transport infrastructure."
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