Site classification & soil testing
AS 2870 site classification reports and residential soil testing for new homes, extensions and granny flats across Sydney and Wollongong.
From $750Service details →
Geotechnical engineers · Sydney & NSW
Know the ground.
Build with confidence.
Clear geotechnical investigations, site classification reports and construction advice for homeowners, builders and developers.
- Registered Australian business
- Reports aligned with relevant Australian Standards
- Greater Sydney & NSW coverage
Illustrative site profileInvestigation summary
TEST LOCATIONBH01
GROUND LEVELRL 42.60 m
METHODAuger + DCP
0 m1234
FILLSilty clay, trace gravel
RESIDUAL SOILStiff clay, low–medium plasticity
WEATHERED ROCKShale / siltstone profile
BH01DCP BLOWS / 100 mm123456
Ground conditions, interpreted clearlyField observations · test results · design recommendations
Not sure where to start?
Speak with us before requesting a quote
Tell us what your builder, engineer, certifier or council has requested. We will help identify an appropriate scope—without pressure to proceed.
Call (02) 9133 1329Email plans or documents →Direct discussion · Clear next steps · No obligation
What we do
Geotechnical services for your project
Focused scopes, clear communication and practical recommendations—from early design through construction.
Geotechnical investigations
Boreholes, test pits, DCP testing and laboratory coordination to support footing, foundation and pavement design.
From $2,200Service details →
Construction inspections
Footing, foundation, earthworks, compaction and retaining-wall inspections with clear written findings.
From $450Service details →
Slope stability assessments
Assessment of natural and constructed slopes, cuts, fills and development impacts, with practical risk-reduction recommendations.
From $1,500Service details →
Retaining-wall advice
Geotechnical parameters, earth-pressure advice and review support for proposed or existing retaining structures.
Scope-basedService details →
DA and CDC support
Clear geotechnical documentation to help builders, designers, certifiers and approval authorities progress your project.
Scope-basedService details →
Percolation testing
Field infiltration and percolation testing to support stormwater, wastewater and on-site absorption design.
Scope-basedService details →
Working platform assessments
Ground assessment and platform recommendations for piling rigs, cranes and construction plant, informed by BR 470.
Scope-basedService details →
Geotechnical resources
Clear guidance before you build
Practical information for Sydney homeowners and project teams—written to explain the decision, not replace project-specific advice.
How much does a geotechnical report cost in Sydney?
Compare a residential site classification with a broader investigation and understand the factors that shape a quotation.
Read the Sydney cost guide →A, S, M, H1, H2, E and P explained
Understand the AS 2870 site classes and why the result matters to residential footing and slab design.
Understand site classifications →Do I need a geotechnical report for a retaining wall?
Learn when wall geometry, slope, surcharge, drainage and nearby structures can require project-specific ground advice.
Read the retaining wall guide →A simple process
From enquiry to clear advice
We make the technical process straightforward and keep you informed at each stage.
- 1
Tell us about the site
Send the address, project description and any available plans or approval request.
- 2
Receive a clear scope
We confirm what is needed, the fixed fee and the likely timing before you proceed.
- 3
Fieldwork and analysis
We attend the site, coordinate testing where required and assess the results.
- 4
Receive your report
You receive practical findings and recommendations for your project team.
Ground insight.
Engineering clarity.
Engineering clarity.
About Sydney Geotechnical
Professional advice, explained clearly
Sydney Geotechnical is an independently owned practice serving clients across Greater Sydney and New South Wales. We focus on proportionate investigations, defensible engineering judgement and reports that are useful to homeowners, designers, builders and approval authorities.
Relevant standardsScopes and reporting informed by AS 1726 and AS 2870 where applicable.
Practical communicationClear limitations, findings and next steps—without unnecessary jargon.
Responsive serviceDirect communication from initial enquiry through to reporting.
Service area
Greater Sydney, Wollongong and NSW
Based in South West Sydney and available for projects throughout metropolitan Sydney, the Illawarra and surrounding regions.
Check availability for your suburb →Common questions
What clients ask before getting started
Still unsure what your project needs? Send the request you received from your engineer, certifier or council and we can help define the scope.
Email your documents →When is a geotechnical report needed?+
A report may be requested by your structural engineer, certifier or council for footing design, a site classification, a sloping site, retaining works or where ground conditions are uncertain. Send us your plans or approval request and we can recommend an appropriate scope.
How much does a geotechnical report cost in Sydney?+
A standard residential site classification starts from $750, a single construction inspection from $450 and a geotechnical investigation from $2,200. Access, development size, drilling depth and laboratory testing can change the final fee. We confirm a fixed quote before work begins.
What soil testing is needed for a new home in Sydney?+
A residential project commonly needs an AS 2870 site classification based on a site investigation, soil description and assessment of expected ground movement. Laboratory testing may be added where it materially informs the classification. The footing designer uses the report for slab and footing design.
Which areas do you service?+
We service Greater Sydney and projects across New South Wales, including Western Sydney, South West Sydney, the Hills, North Shore, Northern Beaches, Sutherland Shire, Blue Mountains, Central Coast, Illawarra and Southern Highlands.
What should I send for a quote?+
The site address, a short description of the proposed works, available architectural or structural drawings, and any council or certifier request. Photos of access constraints are also useful.
Do you work with homeowners and builders?+
Yes. Sydney Geotechnical supports homeowners, builders, designers, structural engineers and developers, from residential additions to larger development investigations.
Request a quote
Tell us about your project
Choose the service, add your site details and securely upload available plans or the exact request from your council, certifier, builder or engineer.
- Clear scope and fee confirmed before work begins
- PDF, JPG and PNG uploads accepted securely
- Direct response from Sydney Geotechnical
Prefer to speak first?
Call (02) 9133 1329 →