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Grading

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Grading is the reshaping of ground: cutting high areas down, filling low ones, and setting the finished levels a garden, a driveway or a building will sit on. On an Australian block it is usually the first trade on site and the one whose mistakes are hardest to undo, because everything built afterwards inherits the levels it leaves behind.

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The National Construction Code puts numbers on it. The ABCB Housing Provisions on earthworks require site cuts to be within the allotment and not deeper than two metres from natural ground level at any point, and fill to be placed within the allotment and no more than two metres in height from natural ground level. Filling must be placed and mechanically compacted in layers of not more than a hundred and fifty millimetres, and where filling is carried out, surface water must be diverted away from any existing structure on the property and on adjoining allotments.

The provision that catches homeowners is what happens at the face of the cut or fill. The Housing Provisions set maximum slope ratios for un-retained embankments by soil type, and where an embankment is steeper than those ratios, or the soil type is not listed, retaining walls must be installed. That is the moment a grading job stops being earthmoving and becomes structural work, with an engineer, a licence and often an approval attached.

The earthworks limits that govern cut and fill

  • Site cuts must be within the allotment and no deeper than two metres from natural ground level at any point.
  • Fill must be placed within the allotment and rise no more than two metres from natural ground level.
  • Filling must be placed and mechanically compacted in layers of not more than a hundred and fifty millimetres.
  • Maximum slopes for un-retained cut and fill embankments are set by soil type in the Housing Provisions.
  • Where an embankment is steeper than those ratios, or the soil is not covered, retaining walls must be installed.
  • Where filling is carried out, surface water must be diverted away from existing structures on your property and on adjoining allotments.

Reshaping the ground or retaining it: which one your site needs

There are only two ways to change a level: slope the ground between the two heights, or hold it with a structure. Sloping is cheaper, needs no engineering on modest changes, and is limited by how much horizontal room the site has and by the maximum slope the soil will stand at un-retained. Retaining buys the level change in a short distance and costs far more, because it is a structure with loads, drainage and, above a certain height, engineering behind it.

The decision is usually forced by the block rather than chosen. A wide, gently sloping yard can absorb a level change as a graded batter or a shallow terrace. A narrow urban block with a boundary a metre from the change has no room to slope and must retain. The useful exercise before you commission anything is to draw the slope the soil will stand at and see whether it fits between the two points. If it does not, you are buying a wall.

Approval, licensing and the paperwork grading attracts

Approval for earthworks and retaining is graded rather than binary in Australia, and it is state and council specific. New South Wales operates an exempt development pathway under which many minor and low impact works need no planning or construction approval, but only where every development standard in the relevant State Environmental Planning Policy is met and the work is structurally adequate and installed in accordance with manufacturer specifications complying with the Building Code of Australia. Heritage-listed property and environmentally sensitive land fall outside that pathway entirely.

The licensing side is separate again. In New South Wales retaining walls that are not part of a habitable building sit inside the structural landscaping work category, and a contractor licence is required for residential building or trade work valued at more than five thousand dollars in labour and materials including GST. Other states have their own classes and thresholds, so confirm both the approval pathway and the licence class before work starts.

How a grading job should be sequenced

  • Establish the survey and the finished levels first, including the levels at every boundary.
  • Lodge an underground services enquiry, because grading machines strike services just as excavators do.
  • Strip and stockpile topsoil separately, since it is the most valuable material on site and is routinely buried.
  • Cut to the design levels, and confirm the depth against the two-metre limit rather than guessing.
  • Place fill in compacted layers of not more than a hundred and fifty millimetres, testing as you go on anything structural.
  • Batter or retain the faces according to the soil type and the slope ratios that apply.
  • Set surface falls and temporary drainage before the site is left over a weekend of rain.
  • Respread topsoil last, so the finished surface is something that will actually grow.

What a badly graded site looks like a year later

  • Settlement across the filled areas, because the material went in as one lift instead of compacted layers.
  • Ground built up against the house so that water and termites have a path the design never intended.
  • A cut face slumping after heavy rain, which is the soil telling you it needed retaining.
  • Water now ponding on the neighbour's side, which is both a practical failure and a dispute.
  • Topsoil buried under the fill, leaving a surface nothing will grow in.
  • Levels that do not match the finished floor, discovered only when paving or decking is set out.

Sediment, spoil and the rest of the street

A graded site with no vegetation on it is loose soil waiting for rain, and the first storm carries it onto the footpath, into the gutter and into the stormwater system. Councils take this seriously, and sediment control is routinely a condition of any approval that involves earthworks. Silt fencing on the downslope side, a stabilised entry point so trucks do not track mud onto the road, and covering stockpiles are the standard measures, and they should be on the quote rather than discovered as an extra.

Spoil removal is the other item that surprises people. Cut material has to go somewhere, and the volume coming out of even a modest level change is larger than it looks in the ground. Establish before work starts whether spoil is being removed or reused on site, whether it is suitable as engineered fill if it is being reused, and who is paying the disposal cost if it is not.

Grading: frequently asked questions

How deep can I cut into my block without approval?

The building rules and the planning rules are two separate questions. The ABCB Housing Provisions require site cuts to be within the allotment and not deeper than two metres from natural ground level at any point, and fill to be no more than two metres in height from natural ground level. Whether the work needs planning approval on top of that depends on your state and council: New South Wales, for example, runs an exempt development pathway with its own standards that must all be met.

When does a level change need a retaining wall?

When the face is steeper than the soil will stand at un-retained. The Housing Provisions set maximum slope ratios for cut and fill embankments by soil type, and state that retaining walls must be installed where embankment slopes exceed those ratios or where the soil type is not listed. In practice that decision needs someone who can classify the soil on your site, which is why a geotechnical or structural input belongs at the start of a grading job, not after the face slumps.

Why does filled ground keep settling?

Because it was not compacted properly. The Housing Provisions require filling to be placed and mechanically compacted in layers of not more than a hundred and fifty millimetres, which is deliberately thin: a machine can only compact so far below the surface it is running on. Fill tipped in a single lift consolidates under its own weight and under rain for years afterwards, which is what produces the dish in the lawn and the step at the edge of the paving.

Do I need a licensed contractor for grading and retaining?

For the retaining, in most states yes once the value threshold is passed. New South Wales includes retaining walls that are not part of a habitable building within its structural landscaping work category, and requires a contractor licence for residential building or trade work valued at more than five thousand dollars in labour and materials including GST. Earthmoving itself may sit under a different licence again, so ask which class the contractor holds and check it on the regulator's public register.

Can grading change where water goes on my property?

That is precisely what it does, which is why it has to be designed rather than improvised. The Housing Provisions require that where filling is carried out, surface water is diverted away from any existing structure on the property and on adjoining allotments. Regrading a yard without deciding in advance where the water will now run is the most reliable way to create a drainage problem, a damp wall or a dispute with the neighbour downslope.

Sources

  1. NCC: ABCB Housing Provisions Part 3.2 Earthworks, cut and fill limits and embankment slopes
  2. NSW Planning Portal: Exempt development
  3. NSW Government: Structural landscaping work licence

Written by the LokalMatch editorial team. Last reviewed 22 September 2026. How we write and check our guides

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What affects the cost of grading

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Size of the yard and the scope of the design
  • Grading, excavation and drainage work
  • Hardscape materials, such as stone, pavers or wood
  • Plants, sod and soil
  • Access for machinery
  • Removal of old materials, trees or stumps
  • How often visits are scheduled for ongoing services

How to compare grading contractors before you hire

  • Choose a company that does the kind of work you need, since design, lawn care, tree work and hardscaping are different specialties.
  • For big projects, ask for a site plan or drawing before work starts.
  • Ask how they'll handle grading and drainage so water moves away from the house.
  • For tree removal or large pruning, look for a qualified arborist with liability insurance.
  • For ongoing services like lawn care or snow removal, get the visit schedule and what's included in writing.

Questions to ask grading contractors before you hire

  • Can I see a plan or drawing before you start?
  • How will you handle drainage and grading?
  • Will you have underground utilities located before you dig?
  • Does any of this work need a permit, such as for a retaining wall, fence or tree removal?
  • What plants or materials do you recommend for our climate and my yard's sun and shade?
  • Do you guarantee plants or sod, and for what conditions?
  • Can you show me proof of liability insurance?

When to call a pro for grading

  • Water that pools near the house or in the yard after rain
  • A tree that is leaning, cracked or has large dead branches over the house or a driveway
  • A retaining wall that is bulging, leaning or cracking

Grading permits and local rules

Some grading work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

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