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Green Zone, Technical Category 2, yellow

  • Land classified as green means that homes are suitable for repair and rebuild.

    Key points to note

    • Land generally suitable for houses to be repaired or rebuilt;
    • Property owners should talk directly with their insurer or EQC about repairs;
    • Property owners no longer have to wait for the results of any area-wide land assessment reports by EQC or their engineering consultants Tonkin & Taylor;
    • There will be some isolated exceptions where geotechnical assessments will be required due to major land damage;
    • Repair and rebuilding work should take into consideration the risk of ongoing aftershocks, so some finishing tasks such as brick and driveway concrete laying should be delayed until that risk decreases.

    What does Technical Category 2 (TC2, yellow) mean?

    Some properties in the green zone have experienced liquefaction-related land damage and considerable settlement during the sequence of Canterbury earthquakes. While land in the green zone is still generally considered suitable for residential construction, houses in some areas will need more robust foundations or site foundation design where foundation repairs or rebuilding are required.

    Technical Category 2 (TC2, yellow) means that minor to moderate land damage from liquefaction is possible in future significant earthquakes.

    You can use standard timber piled foundations for houses with lightweight cladding and roofing and suspended timber floors or enhanced concrete foundations.

    Detailed foundation requirements information is available on the MBIE website.

    Further information about green zone technical categories »

    What happens next?

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

  • What is the difference between the technical categories?

    Land in the green zone has been divided into three technical categories. These categories describe how the land is expected to perform in future earthquakes.

    Technical category 1 (TC1) - grey

    Future land damage from liquefaction is unlikely. You can use standard foundations for concrete slabs or timber floors. Foundation requirements changed in 2011 and information is available on the MBIE, Building and Housing Group website.

    Technical category 2 (TC2) - yellow

    Minor to moderate land damage from liquefaction is possible in future significant earthquakes.

    You can use standard timber piled foundations for houses with lightweight cladding and roofing and suspended timber floors or enhanced concrete foundations – i.e. more robust floor slabs that better tie the structure together as outlined in the Department of Building and Housing 2010 Guidance on house repairs and reconstruction following the Canterbury earthquake. More information is available on the on the MBIE, Building and Housing Group website.

    Technical category 3 (TC3) - blue

    Moderate to significant land damage from liquefaction is possible in future significant earthquakes. Site-specific geotechnical investigation and specific engineering foundation design is required.

    Related information

    Residential green zone technical categories

  • Top green zone technical category 2 questions

    What do I need to do to ensure my repairs meet Building Code requirements?

    Homeowners whose land is in TC2 can get on with rebuilding their homes with confidence. The only further site-specific geotechnical investigation required is the simple shallow soil strength testing which is standard for all homes.

    New foundations

    If your home is in TC2 and you are rebuilding foundations the Department of Building and Housing recommends that you use:

    • Standard (NZS3604) piled foundations for houses that:
      • Are built of lightweight materials (not masonry or brick veneer). For example tin, not tiled, roofs and lightweight cladding such as weatherboards; and
      • Have timber floors instead of concrete floors
    • Or enhanced slabs (more robust foundations) such as those outlined in the Department of Building and Housing’s December 2010 Guidance on house repairs and reconstruction following the Canterbury earthquake.

    Repairs to foundations

    If you are carrying out repairs to foundations or other areas of you home these should be carried out in accordance with the Department of Building and Housing’s 2010 Guidance on house repairs and reconstruction following the Canterbury earthquake

    The Guidance on house repairs and reconstruction following the Canterbury earthquake document is being updated. A summary of the update, the 2010 guidance and other documents are available on the MBIE, Building and Housing Group website.

    Talk to your builder or project management office about the requirements of this guidance and the Building Code.

    How much are repairs to foundations likely to cost?

    The average additional cost for homeowners in Technical Category 2 with foundations that need to be repaired or rebuilt due to earthquake damage is expected to be around $5,000. However, depending on site circumstances costs may range from no additional cost to around $10,000.

    What if my house wasn’t damaged in the earthquakes and is in TC2?

    The technical categories only apply to houses that require their foundations to be repaired or rebuilt due to damage from the earthquakes. If your house was not damaged by the earthquakes then you will not need to upgrade your foundations.

    Where can I find more information?

    More information is available on the MBIE, Building and Housing Group website.

In this section you will find information about the various types of support and assistance that are available, in these categories:

Earthquake assistance centres

These are centres where you can access staff and information from a range of agencies about earthquake-related matters. The centres also provide information and assistance for red zone homeowners who have insurance and are deciding about the government offer.

Find out more »

Housing

There is information here about temporary accommodation options, affordable section development projects for residential red zone homeowners, and a collection of useful links covering different property types and situations, including rentals.

Find out more »

Financial assistance

This is a collection of information about financial, debt, tax and accommodation assistance and services available to individuals and businesses affected by the earthquakes.

Find out more »

Health and wellbeing

This section explains about the Earthquake Support Coordinators, who are available for free to assist people in navigating their way through the wide range of services available. It also gives the location of the Recovery Information Kiosks.

The health and wellbeing services and links covered here include:

  • various options for counselling and support services, including for Māori, new migrants, and those affected by family violence
  • energy advice and assistance with keeping warm at home
  • handling food and drink during an emergency

Find out more »

Community organisations

We’ve provided links to websites across greater Christchurch that can inform you of local community activities and events as well as innovative community initiatives taking place in your community.

Find out more »

Residential Advisory Service

The Residential Advisory Service (RAS) provides free, independent help to residential property owners who are facing challenges in getting their home repaired or rebuilt after it has been damaged by the Canterbury earthquakes. The service helps you to understand the process you are going through and to make progress in your repairs or rebuild.

For further information about the service visit the Residential Advisory Service website www.advisory.org.nz

Related information