The National Capital Authority said it was reviewing each of the 599 submissions made in relation to the controversial development, after public consultation ended last month.

"The authority is reviewing each submission to identify key issues and suggestions to determine if modifications to the proposal are required," an authority spokesman said.

"The authority does not anticipate this process will be finalised before the end of June."

A consultation report on issues raised from the hundreds of public submissions will be released following the review.

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The multimillion-dollar proposal would see the addition of more gallery space, which the memorial says would be used to host more of its collection, including honouring more recent conflicts such as Iraq, Syria and Afghanistan.

However, the 20-year-old Anzac Hall, which has won design awards, would need to be demolished to make way for the expansion, with critics saying the demolition was unnecessary.

The project would need final approval from the National Capital Authority before construction can commence.

A spokesman for the memorial said the institution had consulted widely about the redevelopment and was actively participating in the process being carried out by the National Capital Authority.

"Hundreds of Australians have responded through these processes, and their concerns have been addressed clearly and publicly," the spokesman said.

"As an example, the memorial made more than 50 changes or clarifications to its design and documentation resulting from public consultation on our EPBC final preliminary documentation."

The memorial said it did not anticipate any impact on the construction timeline for development following the large number of submissions received by the National Capital Authority.

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