Work to repair the storm-damaged seawall at Wollongong’s Flagstaff Hill is about halfway complete.
Construction on the seawall started in July 2018 and is expected to be finished, weather permitting, in October 2019.
That will be more than three years since a king tide – linked to an east coast low - severely damaged a 50-metre section of the wall in June 2016.
The heritage-listed wall, which spans 215 metres and is up to 3.6 metres high, was built by convicts in the 1880s.
Department of Industry's lands and water spokesman said work had progressed well despite some big tides and ocean swells.
"Completed works includes the reconstruction of the section that collapsed due to storm wave in 2016," he said.
"Future building work includes rebuilding with the original stones that are in good condition and replacement with new stones where original stones cannot be reused.
"Works will also include the removal and replacement of failed sandstone blocks, repair of undercutting to the sea wall with concrete, filling of voids with mortar, repointing with new mortar and repair and stabilisation of the mortar capping to top of the wall."
The NSW government revealed Gladesville-based company Marina and Civil Maintenance would undertake the repair and conservation work, worth $3.7 million in June 2018.