For retaining walls 1 m or higher the new zealand building code may require a safety barrier at the top.
How to build a concrete retaining wall nz.
So if your wall is higher than 1 5 metres or it supports a driveway parking area or the weight of a bank or building above the wall you should consult an engineer and obtain a building consent.
But even walls which do not require a building consent must comply with the requirements of the new zealand building.
For a low retaining wall the posts must go 100 mm into the ground for every 100 mm retained above ground.
Should also be provided in the base of the wall.
Avoid having downspouts pointed at the retaining wall and if it s against the house keep soil and mulch well below the siding.
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Concrete masonry retaining walls can be designed in accordance with the following new zealand standards but it is prudent to have the design checked and inspected by a structural engineer.
Starting from 299 per metre.
In new zealand retaining walls over 1 5 meters high or walls carrying extra loading on top require a building consent from the local body council.
Depending on the concrete blocks used a retaining wall made from concrete blocks could start from around 299 390.
Designing retaining walls when a building consent is required the wall must be specifically designed by a registered engineer.
When a building consent is required the wall must be specifically designed by a registered engineer.
Follow the block manufacturer s instructions for wall height limits.
The interlocking retaining wall block can be used to build walls up to 24 to 36 inches high depending on the size of the block.
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Another concrete option is traditional grey 300 by 150 millimetre blocks but it s not a diy type job as it involves steel and filling.
Walls higher than 1 5 m will require a building consent.
Cost for a concrete retaining wall.