Northport at Marsden Point has a view to nearly double in size but will not draw up a proposal until any group or individual with an opinion on the idea has had their say.
The port company's vision will not become a fully formed or even a formal proposal without that community and wider feedback, chief executive Jon Moore said.
''This is not yet a proposal, it's a vision we're putting up for community feedback,'' Mr Moore said.
Northport's tentative pre-proposal sketch for ''discussion and feedback'' includes almost doubling the berth capacity from the current 570 metre to 1309 metres and its footprint from 48 hectares to 75 hectares.
The expansion would involve a linear berth development to the east and west of the present wharves, meaning no further encroachment into the harbour.