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In accordance with AS 4100, the length of the bolt shall be at least one clear thread above the nut.
The photo shows an unacceptable installation of the nuts as the threads are too short and are not one clear thread past the nut.
Brisbane City Council has now published further information about changes to siting variations which can be found at: https://www.brisbane.qld.gov.au/planning-and-building/do-i-need-approval/types-of-approval/building-near-the-boundary