Whanganui couple Mark and Nicola Goodier are likely to take on the Earthquake Commission in the Whanganui High Court in September, their son Louis says.
The June 2015 flood and rain event caused a huge slip on the pair's section in Shakespeare Rd. The slip took out part of the driveway and undermined the garage.
The house tilted very slightly and was red-stickered as dangerous by Whanganui District Council. The Goodiers had to move to rented accommodation.
The Earthquake Commission (EQC) has offered them $76,000 to repair the slip and $38,000 to fix the garage. But Louis Goodier says it would cost more than $200,000 to repair the slip.
The house is insured, but their insurer doesn't have to pay to fix it unless EQC estimates will cost more than $115,000 to repair.