Canterbury, NZ 03 661 7200
ChristchurchEarthworks.

Retaining, Landscaping & Grading

Christchurch Retaining Wall Excavation & Groundworks

Precision excavation and groundworks for retaining walls across Christchurch's hill suburbs, cutting and benching to your engineer's design before the wall goes in.

03 661 7200

Your site. A clear next step.

Retaining Wall Excavation & Groundworks Christchurch

Christchurch Retaining Wall Excavation & Groundworks means precision excavation and groundworks for retaining walls across Christchurch's hill suburbs, cutting and benching to your engineer's design before the wall goes in.

Tell us what you want to achieve, where your site is and when you would like to start. Include any plans, access constraints or measurements that will help us understand the work.

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Recognise your project

Make room for the retaining structure

Hillside residentialLifestyle blockCoastal sectionSubdivision lotCommercial site
  • Sloping section limits usable building or garden space
  • Existing retaining wall showing signs of movement or failure
  • Bank needs cutting back before a new wall can be built
  • Water pooling or seeping behind an existing wall
  • Narrow hill-site access restricting machinery options
  • Old fill or unstable ground behind a proposed wall line

Define the work

Define the footing, working space and backfill

01

Site assessment against your engineer's or wall builder's drawings

02

Cutting and benching to specified depths, lines and batter angles

03

Excavation for wall footings and foundations

04

Removal and cartage of spoil off site

05

Excavation of a drainage channel behind the wall line

06

Preparation of a stable, compacted base for the wall crew

07

Temporary access and safety works for a steep or confined site

08

Handover walkthrough with the wall-building contractor before they start

From site assessment to completion

From wall set-out to prepared ground

  1. 01

    Plan review

    We go through the engineer's or designer's drawings with you so the excavation matches the approved design before any digging starts.

  2. 02

    Site setup

    We set up access, temporary fencing and erosion control measures suited to the slope and site constraints.

  3. 03

    Cutting and benching

    Ground is cut and benched to the specified levels and batter angles, checked against the drawings as we go.

  4. 04

    Footing excavation

    We excavate to the depths and dimensions required for the wall's footings or foundation system.

  5. 05

    Spoil removal

    Excess material is loaded out and carted away, or stockpiled on site if it's needed for backfill later.

  6. 06

    Handover

    The site is left ready for the wall-building contractor, with drainage excavation in place where specified.

Illustrative retaining wall excavation & groundworks work

Working conditions

Equipment and access for retaining wall excavation & groundworks

Most retaining wall excavation on Christchurch hill sites is done with compact excavators that can manoeuvre in tight, sloping access. Larger machinery may be used where access allows and the scale of the cut requires it. We select gear based on the site rather than a fixed approach.

Plan around the work

Expect some disruption to driveways, gardens or shared access while cutting and cartage are under way. Hill sites often need temporary tracks or fencing for machine access, which we remove once excavation is complete. Truck movements for spoil removal are scheduled to suit the site and, where relevant, your neighbours.

Get the detail right

Retaining Wall Excavation & Groundworks: decisions that matter

Cutting into a bank changes how that ground handles water and load, so excavation needs to follow the depths and batter angles an engineer has specified, not a general estimate. Getting this wrong can undermine the stability of the slope or the wall built on top of it. We carry out the groundworks; the wall design, consent and construction remain with your engineer and wall-building specialist.

Do you design the retaining wall?

No. We carry out the excavation and groundworks only. Wall design and any required structural engineering sign-off need to come from a qualified engineer or designer before we start cutting.

Do you build the wall itself?

No, wall construction is carried out by a specialist wall-building contractor. We prepare the ground, cut to the required lines and levels, and hand over a site that's ready for them to start.

Does my retaining wall need engineering approval?

Many retaining walls over roughly 1.5 metres require engineering design and building consent under the New Zealand Building Code. Check with your engineer or council early, since it affects how the excavation needs to be carried out.

Can you recommend a wall designer or builder?

We're happy to point you toward the questions to ask, but we don't hold ourselves out as your engineer or wall builder. If you don't already have one lined up, your council's building consent team is a good place to start.

What about drainage behind the wall?

We can excavate the drainage channel behind the wall line to the dimensions specified in the design. The drainage system itself, including any pipe and outlet design, is generally specified by the engineer and installed alongside the wall build.

How steep can the cut be?

That depends on the soil type and what the engineer has specified for temporary and permanent batter angles. We follow those specifications closely, since an over-steep cut can be unstable even before the wall goes in.

The next part of your project

Work that connects with retaining wall excavation & groundworks

Planning this work

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Planning retaining wall excavation & groundworks?

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YOUR SITE. THE NEXT CHAPTER.

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