The transport company will be working to refurbish the station's toilets, improve the floor surface on the mezzanine walkways in the station and to reopen a public access corridor through the main building.
The current toilet facilities, which have reached the end of their serviceable life, will be stripped out and a new facility will be installed utilising energy efficient systems and fittings.
The refurbished station toilets will also include a Changing Places facility, designed to support those passengers with complex care needs.
This mean's Scotland's three busiest station's Glasgow Central, Edinburgh Waverley and Glasgow Queen Street will all have Changing Places.
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Temporary toilets will be available for passengers throughout the refurbishment work, located at the east side of the station near platforms 2-5.
Work has also begun on a new public corridor which will connect the east concourse with the ticket hall – restoring a walking route which was part of the original station design.
Part of the existing Burger King retail unit, and office space, will be remodelled to create the walkway, due for completion in spring 2021.
The flooring on the concourse mezzanine level will be refurbished by the end of this year.
Patrick Henry, station manager, said: "We are delivering these works as quickly as possible for passengers.
"The new toilet facilities will provide a brighter, modern, environmentally friendly and more comfortable experience for passengers.
"We are also delighted with the new addition of a Changing Places facility which will make a huge difference to people with complex care needs."
Laura Rutherford, PAMIS Changing Places campaign coordinator, said: "PAMIS and the Changing Places Toilet Consortium are delighted that Edinburgh Waverley station is installing a Changing Places toilet. This facility will increase opportunities for people with a range of disabilities, as well as their carers and families, to access rail travel."
