On 29 November 2021, changes to the New Zealand Building Code for dealing with liquefaction-prone land come into effect to ensure new buildings are built strong enough to withstand liquefaction effects.
This means, if you are applying for a building consent after 29 November 2021, you will need specifically designed foundation for buildings on ground identified as liquefaction-prone land.
When we receive a building consent (post 29 November 2021) each site will be considered on its own merits with the application having to contain enough geotechnical information to allow us to determine whether the proposed foundation design is appropriate for that site.
The current ‘deemed to comply’ acceptable solutions, such as NZS3604 for foundations, are unlikely to be able to be used.
Further information can be found on the Otago Regional Council website regarding the assessment of liquefaction hazards GNS Science Consultancy Report (orc.govt.nz) and the Otago Natural Hazards portal Otago Natural Hazards Portal (orc.govt.nz)
Further information can be found on the Ministry of Business, Innovation and Employment web site.