Excavation and site preparation: what an earthmoving contractor actually does

Once a site has been cleared following demolition, or before a new build begins, excavation and earthmoving contractors typically take over to shape the ground for whatever comes next. Understanding the actual scope of this work — and what commonly drives its price — makes it easier to know what a quote and a schedule should reasonably cover.

The work generally starts before any digging happens, with locating underground services. Before You Dig Australia, formerly known as Dial Before You Dig, is a free national referral service used to identify underground gas, water, telecommunications and electricity assets in the area a project is planned for. Checking this before excavation starts is standard practice for a competent contractor, since it materially reduces the risk of damaging existing infrastructure or causing disruption, injury, or worse, to anyone nearby.

From there, the core of the work is bulk excavation and site preparation — cutting and grading the site to the levels a project design calls for, removing existing spoil, and clearing tree stumps, roots and any remaining debris from a previously demolished structure. The specific scope varies significantly by project, from a modest site cut for an extension through to full-site bulk excavation ahead of a new build, and the ground conditions found on site — soil type, rock, existing contamination — meaningfully affect both how the work is carried out and how long it takes.

On the question of who can operate the machinery involved, a high risk work licence is not required to operate a standard excavator for general earthmoving tasks under current Australian WHS laws. That licence becomes mandatory once an excavator is being used for lifting operations above roughly 3 tonnes, or as a substitute for a crane, situations that go beyond standard earthmoving. Even where a formal high risk work licence is not required for the job at hand, competent, trained operators are still expected, commonly evidenced by a recognised civil construction excavator unit of competency, so it is entirely reasonable to ask an earthmoving contractor about operator training and experience even for work that does not legally require a high risk work licence.

Pricing for excavation work is commonly structured a few different ways, and it is worth understanding which basis a quote is actually using. Bulk excavation in standard soil conditions is commonly priced somewhere around $60 to $120 per cubic metre including cartage, rising toward $150 per cubic metre or more where roots, rock or contaminated material need additional handling and disposal. Where equipment is hired with an operator by the hour rather than priced by volume, rates commonly reported across the industry run around $80 to $150 an hour for a mini excavator, $120 to $220 an hour for a standard excavator, and $180 to $350 an hour for a larger excavator. Site cuts and grading work is commonly priced instead on a per-square-metre basis, reported around $8 to $25 per square metre depending on the scope involved. These are general industry ranges rather than a quote for a specific site, and which pricing structure applies, and where a given job lands within these ranges, depends heavily on the contractor, the equipment required, and the ground conditions actually found on site.

Given how much soil conditions, access and the volume of material to be removed can shift these numbers, a written, site-specific quote from an earthmoving contractor who has actually assessed the ground — rather than a phone estimate based on a general description — is the most reliable way to know what a specific excavation or site preparation job will cost. This article is general information, not engineering or project advice, and any specific project should be assessed and carried out by a suitably qualified and, where relevant, licensed contractor. Our directory lists Australian excavation and earthmoving contractors by area if you are ready to compare quotes.

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