Tracked excavator digging a foundation trench on a Perth residential building site

Earthworks and Excavation Estimating Perth

Cut and fill volumes, bulk excavation, trenching, compaction and WA tip and disposal rates calculated from your site drawings and soil report. Accurate earthworks quantities that subbies can price confidently.

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18+ years experience
First estimate free
24hr turnaround
No lock-in contract

The Trade That Blows Out on Site

Earthworks is the most commonly under-estimated trade on a construction job. Volumes look manageable on a plan and blow out on site.

Soil classification changes the excavation rate. Disposal costs move with material type and tip location. All of that has to be in the estimate before you price the job, not discovered halfway through the dig.

We calculate earthworks quantities for Perth builders, earthmovers and civil contractors. Cut and fill volumes off real contour data, bulk excavation depths, service trenching, compaction layers and disposal quantities. Send us the survey and drawings and we will handle the numbers.

Site survey drawing with contour lines and spot levels laid out with a scale rule and dividers

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What We Cover in an Earthworks Estimate

Element	What We Measure	Notes
Cut volumes	Bulk earthworks cut in m3 from contour data	Includes swell factor for loose material
Fill volumes	Engineered fill in m3 by layer specification	Compaction factor applied to calculate supply volume
Net cut/fill	Balance of cut against fill on site	Identifies surplus or deficit for disposal/import
Topsoil strip	Stripping depth x area in m3	Stockpile or disposal quantity noted
Bulk excavation	Depth x area in m3 by ground type	Rock or hard material noted as a provisional sum
Trench excavation	LM x width x depth by service type	Telecommunications, sewer, stormwater, electrical
Compaction layers	Fill layers in m3 by specification	Proof roll or testing allowances if specified
Disposal	Surplus material in m3 by soil type	WA tip gate rates applied by waste classification

Earthworks takeoff elements for a typical residential or civil project. Rock excavation and contaminated material disposal are priced as provisional sums unless confirmed by a geotechnical report.

What Is Earthworks Estimating?

Earthworks estimating is the process of calculating cut and fill volumes, excavation depths and disposal quantities from survey data and site drawings, then pricing those quantities using current plant hire rates and WA tip costs. An accurate Perth earthworks estimate needs contour data or a survey. A flat plan with no levels will produce a volume figure that can be badly wrong on a sloping site.

WA Disposal Rates and Tip Costs

Perth tip gate rates move with the material and the facility. Clean soil, contaminated soil, rock and concrete rubble all go to different places at different costs.

Haulage moves too. Tipping out of an inner-ring suburb costs more in truck time than tipping from an outer suburb, even when the gate rate is identical.

We apply current WA disposal rates. If you have a preferred tip or a known gate rate, tell us and we will use your number instead of ours.

Cut To Fill Beats Cart To Tip

The biggest saving on an earthworks job is using the cut as fill on the same site. That needs the material to be clean and compactable and the soil classification to suit.

We calculate the net cut and fill balance so you know exactly what has to leave and what can stay. On a sloping block that one number is often the difference between a job that makes money and one that does not.

Tracked excavator parked on a graded sand pad beside a limestone cut face at a Perth earthworks site — Every cubic metre this machine lifts either stays on site as fill or becomes a gate fee plus a haulage leg, which is why the balance is worth getting right on paper first.

Volumes measured

Cut, fill and disposal

Local tip rates

Current Perth market

Class

Soil classification

Affects rate and disposal

24hr

Turnaround

Residential sites

Bulk earthworks across a Perth land subdivision with graded sand pads, limestone cut faces and an excavator working

We Read The Site Before Anyone Turns A Wheel

A subdivision like this is thousands of cubic metres of decisions made before a machine arrives. Where the balance point sits, which lots carry surplus, what leaves site and what gets pushed next door.

Get that wrong on paper and you find out about it in truck movements. Every extra load is a gate fee, a haulage leg and an hour of machine time nobody priced.

We work it out off the contours first, lot by lot, so the number you quote is the number the site actually produces.

Residential and Civil Earthworks

Residential house site cuts on sloping blocks, split-levels and basement garages
Residential retaining wall earthworks and backfill compaction
Subdivision earthworks with a lot by lot cut and fill balance
Civil road construction, subgrade preparation, road base, kerb and gutter
Drainage earthworks, stormwater pit excavation and pipe trench quantities
Industrial hardstand preparation, subgrade, subbase and base course
Pool excavation including spoil removal quantities
Footpath and crossover earthworks

01
Survey and Drawings In
Send site survey, contour plans and any geotechnical or soil test report. Flat plans without contour data will produce less accurate volume calculations.
02
Volume Calculation
Cut and fill volumes calculated using grid or cross-section method from contour data. Net balance calculated to determine disposal or import requirements.
03
Disposal and Import Pricing
Surplus material quantified by soil type and priced at current WA tip gate rates plus haulage. Import fill priced at supply plus delivery if required.
04
Plant Rate Application
Excavation and compaction quantities applied to current Perth plant hire rates for the appropriate machine size.
05
Estimate Delivered
Quantities and priced estimate in a structured document. Usually within 24 hours for straightforward residential sites.

The Machine You Price Changes the Number

Excavation gets quoted per cubic metre, but the cost sitting behind that rate is machine hours. A five tonne excavator squeezed onto a tight residential block and a twenty tonne machine working an open subdivision shift very different volumes in a day.

So we price the plant the site can actually take, not the biggest machine on the list, and we allow for float on and off. If you need the machines as well as the numbers, you can compare plant hire in Perth for excavators, bobcats, rollers and tipper work.

Common Questions

Straight answers on how we price earthworks and excavation estimating in Perth. If yours is not here, send your plans and just ask.

For cut and fill calculations, yes. Contour data or a survey is needed to calculate volumes on anything other than a flat site. For simple bulk excavation to a uniform depth on flat ground, plans with dimensions are enough.

We include rock excavation as a provisional sum when geotechnical data indicates hard material below a certain depth. A confirmed rock quantity requires a geotechnical borehole report to price accurately.

Yes. Haulage is calculated based on average haul distance to the tip facility, truckload volumes and estimated trip counts. We apply current Perth tip gate rates for the material classification.

Yes. On civil and subdivision projects we commonly estimate earthworks, concrete and pavement as a combined package. The trades are priced separately so you can compare subcontractor prices against individual elements.

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