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Sydney & New South Wales

Geotechnical Investigations Sydney

A geotechnical investigation develops a reliable ground model for design. We investigate soil, rock, fill and groundwater conditions and provide practical foundation, earthworks and construction recommendations for residential, commercial and development projects.

Indicative feeFrom $2,200Primary referenceAS 1726 geotechnical site investigationsCoverageGreater Sydney & NSW

When this service is useful

The right scope depends on your development, site access, ground conditions and the information needed by your project team. This service is commonly used for:

  • New dwellings and multi-unit residential projects
  • Commercial buildings and light industrial development
  • Pavements, accessways and hardstand areas
  • Sites with fill, soft soil, rock, groundwater or uncertain conditions

What the assessment can include

  • Review of project drawings, proposed loads and site constraints
  • Boreholes, test pits or DCP testing selected for the project
  • Engineering description of soil, fill and rock conditions
  • Laboratory testing coordination where it will materially inform design
  • Groundwater observations at the time of investigation

What you receive

  • Interpreted subsurface profile and investigation results
  • Foundation options and founding-depth recommendations
  • Allowable bearing-pressure guidance subject to project conditions
  • Earthworks, excavation, drainage and pavement advice where relevant
  • Construction-stage verification requirements

Frequently asked

Geotechnical Site Investigations questions

How many boreholes are required?+

The number and depth depend on development size, variability, proposed loads, access and the level of risk. We recommend a proportionate scope rather than applying one number to every project.

Will laboratory testing be needed?+

Testing is selected where it helps classify materials or quantify properties relevant to design. Not every site needs the same test schedule.

Can you investigate restricted-access sites?+

Often yes. Test pits, hand methods or compact equipment may be suitable, but the achievable depth and information quality depend on access and ground conditions.