Jesse Noakes, 36, Gerard Mazza, 33, Matilda Lane-Rose, 20, and Emil Davey, 23, pleaded guilty to attempted unlawful damage and trespass over the August 2023 incident.
About a dozen police were waiting for the Disrupt Burrup Hub group when they arrived at chief executive Meg O'Neill's home early in the morning with an ABC camera crew while she, her partner and their daughter were inside.
Woodside CEO Meg O'Neil said the group's action was designed to threaten her and her family. (Aaron Bunch/AAP PHOTOS)
They were initially facing the more serious charge of conspiracy to commit criminal damage but that was downgraded and they're scheduled to appear in Perth Magistrates Court on Tuesday for sentencing.
In the days after the incident, Premier Roger Cook said the action was carried out by "extremists seeking to terrorise".Â
Ms O'Neill also said the group were extremists and the action was designed to threaten her and her family.
A police prosecutor later told the court the group had yellow paint, water balloons and a bicycle lock in their possession when they were arrested.
Mr Cook also wrote to the ABC to complain about the broadcaster's alleged "complicity" in the incident, saying he doubted the activists would have targeted the property if the Four Corners television crew was not present.
The ABC previously said its journalists attended the property to gather material for a potential report and did not know about the protest plan.
The Burrup Peninsula, in Western Australia's northwest and known as Murujuga to traditional owners, contains the world's largest and oldest collection of petroglyphs.
Disrupt Burrup Hub claims Woodside's operations in the area and its proposed expansion form the biggest new fossil fuel project in the country and could produce billions of tonnes of carbon dioxide by 2070.
It has carried out a series of actions against Woodside in recent years including the release of stench gas at the company's Perth headquarters which forced the evacuation of about 2000 staff.
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