Fundraising took place over several years to enable the project to commission roof design concepts.
The next phase involves raising more money to create full architectural plans, which will then need to be fully costed.
“We are at the beginning of a very long journey in our efforts to reinstate a roof at Lowestoft station,” said Mr Mitchell.
It is part of a wider heritage project hoping to restore much of the station, which has already resulted in the restoration of the former parcels office into an exhibition and meeting space and the opening of a volunteer-led community rail shop and tourist information office.
The Lowestoft Central Project and Wherry Lines CRP are also in discussions with train operator Greater Anglia about improvements to the station’s public toilets.