"We've had record winter rainfall and this is happening all over Wellington unfortunately. This one is further compromised by the water main, which is leaking through the slip.
There have been almost 500 slips over the past few soggy weeks in the capital.
They have been caused by a long period of wet weather, according to GNS Science.
In July, nearly 300mm of rain was recorded in Kelburn, which is almost double the average amount for that month based on recordings from the past 30 years.