As part of your building consent application, you will need to provide geotechnical information relating to your building site.

The Ministry of Business, Innovation and Employment (MBIE) have partnered with the New Zealand Geotechnical Society to develop a series of earthquake geotechnical guidelines. The guidelines explain current practice in earthquake geotechnical engineering.

In addition to site specific geotechnical requirements, there are also different geotechnical requirements for the subdivision of land, which can be found on the Resource Consent page.

Liquefaction Zone Map

The liquefaction zone map, in conjunction with the geotechnical guidelines clarify  the requirements for Resource and Building Consents Clarification and further information on the zones can be found on the ECAN website.

We have summarised the Zones for Geotechnical Requirements for new developments in Selwyn District below:

  1. Confirm if your land is susceptible to damaging liquefaction or not using the Map.
  2. Use the Table below to establish the level of geotechnical investigation required*.

Zone

Subdivision Consent

Plan Change Applications

Building Consent

Damaging Liquefaction Unlikely

Follow MBIE guidelines as required by the Selwyn District Plan and the Resource Management Act (s106)

Follow MBIE guidelines as required by the Selwyn District Plan and the Resource Management Act (s106)

Standard consenting procedures apply.

Shallow foundations are acceptable in accordance with NZ3604:2011 subject to verification of ‘Good Ground’ in accordance with Clause 3.1.3.

Liquefaction Assessment Needed

Follow MBIE guidelines as required by the Selwyn District Plan and the Resource Management Act (s106)

Follow MBIE guidelines as required by the Selwyn District Plan and the Resource Management Act (s106)

Provide a site investigation report carried out by a Chartered Professional Geotechnical Engineer to assess the land for liquefaction susceptibility and advise on suitable foundation design for the site. Not this includes DBH TC zoned area within the Liquefaction Assessment Needed zone.

* Please note that the purpose of this report is purely to review land in the Canterbury area that is likely to be subject to damaging liquefaction using multiple data sources – it does not however look at any other natural hazards which may be present. When considering building and planning implications of any site all natural hazards must be taken into account.

* Refer Council's stance on Ministry of Business, Innovation and Employment (MBIE) guidance on repairing and rebuilding houses affected by the Canterbury earthquakes.


Land not Assessed

Land not assessed will default to the building code clause B1.


Further Information

The Ministry of Business, Innovation and Employment (MBIE) have further information and guidelines on building on ground with liquefaction potential and repairing and rebuilding houses affected by the Canterbury earthquakes which can be viewed on their website.


If you have any further questions please contact:

Building Consents (Structures) - Phone 3472839 or email bca@selwyn.govt.nz

Planning (Resource Consents - Subdivision and Land) - Phone 3472868 or email planninginfo@selwyn.govt.nz