A new ferry terminal will be built at Sydney's multi-billion dollar Barangaroo development and Wynyard, the city's third-busiest station, is to get a $100 million facelift.

The NSW government has released tender documents for the new ferry hub which, it says, will ease pressure on the city’s main dock at Circular Quay and offer access to Barangaroo from the city’s west, east and lower north shore.

The $6 billion, 22-hectare harbourside development – a mix of residential, leisure and retail real estate on the CBD’s western flank – is expected to cater for 11,000 workers by mid-2015, Transport Minister Gladys Berejiklian said.

It’s due to have 23,000 workers on site by August 2019.

Ms Berejiklian also announced the $100 million revamp of nearby Wynyard Station, which will offer access to Barangaroo via a new walkway.

“Everyone knows that Wynyard Station is a relic of the past, and frankly it is time to upgrade one of Sydney’s busiest transport hubs and finally give customers what they deserve,” she said in a statement on Monday.

The work will include an upgraded concourse and platforms, wider ticket gate areas, new lighting and tiling and an overhaul of retail outlets.

The planning approval process is expected to occur in coming months and the state government said customers will see access temporarily reduced while the work takes place.

Sydney’s Museum, Circular Quay and Town Hall stations are also being upgraded.