Singh says around 600 cubic metres of soil came down in the slip – the largest slip Wellington has seen this year.
With more rain forecast this week, Singh says crews will be on standby to clear further slips.
"There's always a chance of slips occurring when it's wet so we'll address it the same way we always do, with crews on standby and keeping an eye on the MetService updates...we start with the worst one and then go from there."
As for the people evacuated from their homes, Singh says only two households have been deemed uninhabitable – but until the engineers assess the slip again, it's hard to know if more properties will join them.
"It's unlikely that more properties will be red-stickered but it is difficult to ascertain if further slips will put properties at risk."