A rock ejected from a Geocon construction site on Northbourne Avenue smashed the window of a neighbouring home, an ACT parliamentary committee has heard.
Officials from the ACT work health and safety agency have told a budget estimates hearing that construction works on Geocon's "urban village" at 220 Northbourne Avenue, Braddon, damaged a nearby building at least twice in 2026.
ACT Work Health and Safety Commissioner Jacqueline Agius said her team had visited the site numerous times in response to notifiable incidents and public complaints.
"On the first occasion that we visited the site ... that was when the rock hit the window and smashed the window," she said.
"The inspectors were satisfied at that stage that the [worksite] had put in place controls, and those controls included raising the fence to that adjoining property by another two metres.
"There were some initial controls put in place that inspectors were happy had relieved the risk, but we were subsequently advised that it happened again."
Independent member Thomas Emerson said his office has received a number of complaints about the construction works.
"There have allegedly been significant negative impacts on the neighbouring property including rocks and dust flying into the building, resulting in at least one smashed window and smashed door, rubble in the car park and potential risk to personal safety," he said.
In a statement, a Geocon spokesperson confirmed an incident had occurred at its Northbourne site.
"As soon as the incident occurred, all appropriate procedures and operating standards were followed, including notification to WorkSafe ACT. The contractor has since implemented additional measures to ensure this incident is not repeated," the spokesperson said.
The 10,663-square-metre site on Northbourne Avenue was sold to Geocon for $54 million in March 2025.
WorkSafe ACT executive branch manager Bill Smith said the last complaint about the "ejection of rocks" from the site was made on June 17, 2026.
"When we received the first notification from the [developer], they'd done an internal review of the incident and advised they were mediating [with the neighbour]," he said.
Ms Agius said staff at the worksite had attached a mesh sleeve over the "chute" rocks came out of to trap the material.
"We haven't received any other complaints since those early ones in relation to rocks going into the neighbouring property," she said.
The commissioner noted she had also received a complaint on July 5 that trucks were lined up along a road near the site, but inspectors did not find evidence of this when they visited.
