Police have recommended charges be laid over protests at Parliament House late last year.
A group of 30 pro-refugee protesters forced the suspension of question time in the lower house, some of whom glued their hands to the leather railing.
A number returned the next day, scaling the building's facade to unfurl a banner and dying the water feature in the forecourt blood-red.
ACT Policing have referred four briefs of evidence to Commonwealth prosecutors for evaluation.
They have recommended criminal charges for damage to the leatherwork in the chamber gallery and the forecourt fountain, and trespass on the building's facade.
Parliamentary departments and the Australian Federal Police are also finalising a report for the presiding officers.
In the meantime, parliamentary security will have a more visible presence in the public galleries - especially during question time - while there will also be more AFP officers outside the chamber where people collect tickets and queue.
Speaker Tony Smith said it will be difficult to eliminate all risk of protest action in the building without much more intrusive screening measures.
"We need to strike a balance between welcoming the public to come and see their parliament in action and ensure that the chambers are not interrupted by vocal and very small minority of people," he told MPs on Tuesday.
"We'll continue to take advice and seek the most prudent balance between the ease of access to the building by visitors and the needs of security."
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