Soil test cost in Queensland: $700 to $3,000+ in 2026

A residential soil test in Queensland, meaning an AS 2870 site classification with two boreholes on a standard suburban lot, starts at about $700 in 2026. Adding footing design takes it to roughly $1,200 to $2,500. A full investigation with laboratory testing starts around $3,000, and complex or disputed sites run higher. An automated desktop report, which is evidence for scoping and pricing rather than a classification, is $119.

This covers what each of those buys in Queensland, what moves the price, how the regions differ, and where a desktop report does and does not substitute.

What you are buying

Site classification (the residential "soil test"). A geotechnical engineer or technician attends the lot, drills or hand augers a small number of holes, logs the profile, and assigns an AS 2870 class from A to P for footing design. This is the report a certifier expects before a slab is designed.

Site classification with footing design. The same fieldwork, plus a designed footing system for the specific house on the specific lot. Usually cheaper bundled than commissioned separately after an unexpected result.

Full geotechnical investigation. More holes, deeper holes, laboratory shrink-swell and strength testing, groundwater observation, and an engineering report with founding recommendations. Required for difficult ground, multi-storey and basement work, retaining and most commercial projects.

Desktop report. Existing evidence assembled for the address: mapped geology, soils, terrain, nearby borehole logs, groundwater records and hazard mapping. No drilling, no laboratory work, no classification.

Indicative Queensland costs, 2026

What you commission	Indicative cost	Turnaround
Automated desktop report	$119	Minutes
Desktop assessment by a consultant	$800 to $1,200	1 to 2 weeks
Site classification, 2 boreholes	from $700	1 to 3 weeks
Site classification with footing design	$1,200 to $2,500	2 to 4 weeks
Full investigation, drilling and laboratory	$3,000+	3 to 6 weeks
Complex, disputed or large sites	$3,000 to $10,000+	Varies

These are ranges for residential-scale work. Commercial and infrastructure investigations are scoped individually and generally start higher. The national picture, including New South Wales and Victoria, is in our geotechnical report cost guide, and the state-by-state price drivers are in soil test cost by state.

What moves the price in Queensland

Distance from the consultant's base. Mobilisation is a real line item. A lot in an outer growth corridor or a regional centre carries travel that a suburban Brisbane lot does not.

Access. Steep lots, narrow side setbacks, established landscaping and soft wet ground can rule out a truck-mounted rig. Hand augering or a tracked rig costs more and reaches less.

Reactive clay and laboratory testing. Where the profile needs shrink-swell index (Iss) testing to settle the class rather than a profile identification, laboratory time is added to field time.

Fill. Fill extends the investigation and can change the arithmetic. Hargreaves (2005), reviewing two decades of AS 2870 practice in South East Queensland, reports that the same clay placed as compacted fill can produce a characteristic surface movement substantially greater than the identical clay in its natural state, because the placed material has no cracked zone to absorb the movement. Fill also frequently pushes a site to Class P.

A Class P result. Class P puts the site outside the standard designs, so an engineer designs the footing specifically, adding investigation and design fees. Hargreaves (2005) also records practitioners' view that Class P is under-reported relative to how often the triggering conditions are present, which is worth knowing when a neighbouring lot's letter is used as a guide. The triggers are set out in Class P site classification.

Urgency. Expedited turnaround attracts a premium, and drilling lead times stretch in busy construction periods.

Regional differences within Queensland

Brisbane, Logan, Ipswich, the Gold Coast and the Sunshine Coast. Dense borehole coverage and well-mapped geology, short mobilisation, competitive market. This is where base pricing applies.

Toowoomba and the Darling Downs. Basalt-derived clays are frequently highly reactive, so classifications more often need laboratory testing rather than profile identification, and results at the H and E end are common.

Coastal lowland estates. Soft compressible deposits, shallow groundwater and acid sulfate soils turn a two-hole classification into a deeper investigation. Screen for these before accepting a quote built on a standard suburban assumption.

Regional and rural Queensland. Travel dominates the quote. Where several lots are being tested, a single mobilisation across them is the main saving available.

What a desktop report does not do

No desktop assessment, including ours, produces a site classification a certifier will accept. AS 2870 requires site-specific investigation, and the letter has to come from an engineer who has seen the profile.

What the desktop evidence provides is the mapped geology, terrain and slope, nearby borehole logs, groundwater records, hazard mapping and a regional reactive-soil screen with an indicative movement range. That is enough to price the investigation, brief the driller, compare lots before purchase and identify the sites likely to need more than the standard two holes. It is a screening and scoping tool, not a substitute.

If laboratory Iss results are already in hand, the free AS 2870 site classification calculator computes the characteristic surface movement and class from them.

Keeping the cost down

1. Screen the lot before booking the rig. A site with fill, soft ground or shallow rock needs a different scope, and finding that out at quotation stage prevents a second mobilisation.
2. Quote classification and footing design together.
3. Give the consultant the site plan, the footprint and the known history. Contingency pricing falls when the scope is clear.
4. Group lots into one mobilisation where more than one is being tested.
5. Book early. Rush jobs and busy periods both carry premiums.

What each line in a quote pays for is broken down in what is in a geotechnical quote, and the commissioning steps are in how to get a geotechnical report.

Common questions

How much does a soil test cost in Brisbane?

A standard residential site classification with two boreholes starts at about $700 in 2026 for a suburban Brisbane lot. Classification with footing design typically runs $1,200 to $2,500, and a full investigation with laboratory testing starts around $3,000.

Is a soil test the same as a site classification?

For a house, generally yes. The residential "soil test" is an AS 2870 site classification: limited drilling, logging of the profile, sometimes laboratory testing, and a class letter for footing design. A full geotechnical report is a larger scope with founding recommendations.

Can a desktop classification be used for building approval?

No. A desktop assessment can indicate the likely reactivity and scope the investigation, but the classification used for footing design must come from site-specific investigation and testing.

How long does a site classification take in Queensland?

Typically one to three weeks from booking to report, driven mostly by drilling availability rather than the assessment itself. Busy construction periods stretch that.

To screen a Queensland lot before commissioning the fieldwork, generate a desktop report for the address, or see a sample report to check what it covers.

LayeredGeo compiles geology, soils, groundwater and site data into an automated geotechnical desktop report for any address in Queensland, New South Wales or Victoria.

Sources

• Hargreaves, B. (2005). 20 years of AS 2870 in South East Queensland: a personal view. Australian Geomechanics, Vol 40 No 3. geomechanics.org.au

About this article. Published by LayeredGeo and written from the published research cited in the Sources section above. It is general information about how property and ground conditions are assessed in Australia, not engineering, planning, legal or financial advice, and it is not specific to any property. Check anything that matters against the source dataset or a suitably qualified professional before you rely on it. If you spot something wrong, tell us at hello@layeredgeo.com.au and we will fix it.

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