A proposal to include the city of Canberra on the National Heritage List appears to have stalled.
The Australian Heritage Council's assessment of the proposal will inform the Federal Government's decision on whether or not to grant Canberra heritage recognition.
The council had planned to finish work in time for Canberra's possible listing early this year, to coincide with centenary celebrations.
But the Federal Government has ordered extra advice about how the listing would affect Canberra's management and future development in the ACT.
Professor Ken Taylor has lobbied for the heritage listing and says the delay is disappointing.
"My concern is in the election year, if it gets postponed much longer we'll be into that interregnum period where no decisions are made and it would just then go into the waiting basket," he said.
He has written to the ACT and Federal governments urging quick action on the matter.