Red Zone information

Flat land residential red zone

For properties in the flat land residential red zone areas, being zoned red means that the land has been so badly damaged by the earthquakes it is unlikely that it can be rebuilt on for a prolonged period.

The criteria for defining flat land areas as residential red zone are:

    • There is significant and extensive area wide land damage

    • The success of engineering solutions may be uncertain in terms of design, success and possible commencement, given the ongoing seismic activity

    • Any repair would be disruptive and protracted for landowners

Key points to note for the flat land residential red zone areas:

    • It is not feasible to rebuild on this land at the present time

    • Wide scale land remediation would take a considerable period of time, the social dislocation of such massive works would see homeowners out of their homes for at least three years, and in some cases more than five years

    • In some areas remediation would require up to three metres of compacted fill to bring the land up to compliant height, along with many kilometres of perimeter treatment

    • In addition, a complete replacement of essential infrastructure like sewer, water, electricity and roading would be required

    • Full land repair in these areas may mean that every house would need to be removed, regardless of its degree of present building damage

    • Even if full land repair was viable, the resulting ongoing social dislocation would have major impacts on schooling, transport and employment for whole communities.

Land Information New Zealand (LINZ) is responsible for Crown-owned properties in Christchurch’s residential red zones, to find out more visit the LINZ website.

Port Hills residential red zone

Being zoned red in the Port Hills means the property is in an area where there is an unacceptable risk to life safety from rock roll or cliff collapse.

In red zone areas affected by cliff collapse, there are immediate risks to life, land remediation is not considered viable and infrastructure would be difficult and costly to maintain.

In red zone areas affected by rock roll, the risk to life is considered unacceptable based on modelling by the Institute of Geological and Nuclear Sciences (GNS). The risk to life is unlikely to reach an acceptable level in a reasonable timeframe. Protective works to mitigate the life safety risk in those areas are not considered practicable, after consideration of a wide range of factors including feasibility, disruption to landowners, timeliness and cost effectiveness.

The assessment of risk has been based on reports on geotechnical issues, prepared and peer reviewed by experts after extensive area-wide investigations and assessments.

LINZ is responsible for Crown-owned properties in Christchurch’s residential red zones, to find out more visit the LINZ website.

The above zoning information is correct to the best of our knowledge at the time of publishing.