AS 2870 site classification
Residential soil assessment for new homes, additions and granny flats, with reports from $750.
View service details →
Request a quoteGreater Sydney & New South Wales
Geotechnical Engineer Sydney
Sydney Geotechnical provides site-specific ground investigations, engineering reports and practical construction advice for homeowners, builders, designers and developers. We assess soil, rock, fill, groundwater and slope conditions so your project team can make informed design and construction decisions.
Residential site classificationFrom $750Geotechnical investigationFrom $2,200CoverageGreater Sydney & NSW
Ground advice for real projects
When should you engage a geotechnical engineer?
A geotechnical engineer should be engaged when ground conditions may influence design, approvals, construction risk or long-term performance. Early advice can help the project team identify investigation, foundation, excavation, drainage or construction issues before they become expensive surprises.
Common triggers include a new dwelling or extension, filled or reactive sites, basement excavation, retaining walls, sloping land, unexpected soil or rock during construction, and a written request from a council, certifier or designer.
Sydney geotechnical services
Investigation, reporting and construction support
Each scope is selected around the proposed work, available access and the decisions your project team needs to make.
Geotechnical investigations
AS 1726 investigations for foundations, excavations, earthworks and development design, from $2,200.
View service details →Slope stability assessments
Assessment of sloping sites, cuts, fills, drainage and development impacts, from $1,500.
View service details →Construction inspections
Footing, foundation, excavation and earthworks inspections with clear written findings, from $450.
View service details →Retaining-wall advice
Ground parameters, founding conditions, drainage and excavation advice for the structural designer.
View service details →DA and CDC support
Focused geotechnical responses for council, certifier and project-team requirements.
View service details →Footing and foundation inspections
Ground observations for accessible footing, foundation and pier excavations before concrete placement.
View service details →Excavation stability assessments
Project-specific assessment of temporary cuts, basement excavations and shoring ground conditions.
View service details →Pavement and subgrade investigations
Ground and pavement-profile information with appropriate testing coordinated where required.
View service details →Piling and foundation geotechnical
Investigation and ground inputs for bored piers, piles and other foundation systems.
View service details →Earthworks and compaction assessments
Earthworks observations with accredited testing coordinated where the specification requires it.
View service details →Crane working-platform assessments
Subgrade and platform assessment for supplied crane configurations and outrigger loads.
View service details →Local ground conditions
Why Sydney sites require project-specific assessment
Sydney development occurs across varied geological settings. A site may contain residual clay, weathered shale or sandstone, coastal sand, alluvial soil, uncontrolled fill, shallow rock or groundwater. Conditions can vary over a short distance because of earthworks, drainage, vegetation and previous development.
A nearby report or geological map can provide context, but it does not replace investigation of the actual building area. The scope should reflect the development, site variability and consequences of uncertainty.
Information that helps us prepare a clear quotation
- Site address and description of the proposed works
- Architectural plans, survey and relevant structural drawings
- Council, certifier or designer requirements
- Photos showing access, slope and existing development
- Known fill, groundwater, cracking or excavation history
Service coverage
A geotechnical engineer for Sydney and surrounding regions
We provide project-specific services across metropolitan Sydney, Wollongong, the Illawarra and surrounding NSW regions.
Check availability for your site →Frequently asked questions
Choosing a geotechnical engineer in Sydney
Clear scope comes first. We explain what is appropriate for the project before work begins.
What does a geotechnical engineer do?+
A geotechnical engineer investigates soil, rock, fill, groundwater and site conditions, then interprets how those conditions may affect foundations, excavations, slopes, retaining walls, pavements and construction.
When do I need a geotechnical engineer in Sydney?+
You may need one when requested by a structural engineer, builder, certifier or council, or where a project involves uncertain ground, fill, reactive clay, rock, groundwater, a slope, retaining wall or excavation.
How much does a geotechnical report cost in Sydney?+
A suitable residential AS 2870 site classification starts from $750, construction inspections from $450, slope stability assessments from $1,500 and broader geotechnical investigations from $2,200. Access, investigation depth, laboratory testing and deliverables affect the final fixed quotation.
Is a geotechnical report the same as a soil test?+
Not always. Soil test is commonly used for residential site classification, while a broader geotechnical report may investigate deeper ground conditions and provide recommendations for foundations, excavations, retaining structures or earthworks.
Which areas do you service?+
Sydney Geotechnical serves Greater Sydney and NSW, including Western Sydney, South West Sydney, Macarthur, Parramatta, the Hills District, Sutherland Shire, Northern Beaches, Blue Mountains, Wollongong and the Illawarra.