Lot / Site Classification Services

Atlas Engineering and Technology Group (AETG) delivers thorough site and lot classification services throughout Sydney. 

Our geotechnical engineers assess your site's soil conditions to classify the ground according to Australian Standards (AS2870). This determines how reactive the soil is and how much movement might occur over time.

What is Lot/Site Classification?

Site classification evaluates the soil's reactivity and potential movement, which directly impacts foundation design requirements. This classification is essential for:

  • New residential construction
  • Home extensions or renovations
  • Commercial and industrial developments
  • Ensuring compliance with building codes and regulations

Classification Types

According to Australian Standard AS2870, sites are classified into these categories:

  • Class A - Stable, non-reactive sites with little or no ground movement
  • Class S - Slightly reactive clay sites with minimal ground movement
  • Class M - Moderately reactive clay sites
  • Class H - Highly reactive clay sites with significant ground movement
  • Class E - Extremely reactive sites with very high ground movement potential
  • Class P - Problem sites (filled, mine subsidence, landslip, collapsing soils)

Our Process

  1. Site inspection and assessment
  2. Soil sampling and borehole drilling as required
  3. Laboratory testing of soil samples
  4. Analysis of soil reactivity and movement potential
  5. Classification report with foundation recommendations
  6. Professional consultation to explain findings

Why Choose AETG for Your Site Classification?

  • Experienced geotechnical engineers with local Sydney knowledge
  • Fast turnaround times to keep your project moving
  • Comprehensive reports accepted by all local councils
  • Cost-effective solutions tailored to your specific project
  • Clear communication throughout the process

Successfully Completed Jobs by AETG to Date

✔ Proposed Residential Development - Warana Road, Cecil Park NSW

The soil classification report, as assessed in the Site Classification Report by AETG, was determined based on detailed fieldwork and laboratory testing. The subsurface profile encountered across three boreholes consisted of a thin topsoil layer overlying sandy clay fill, which transitioned into residual silty clay soils at depth. Laboratory Atterberg Limits testing of the residual silty clay indicated high plasticity, with a Liquid Limit (LL) of 68%, Plastic Limit (PL) of 19%, and Plasticity Index (PI) of 49, categorising the material as a highly plastic silty clay. Based on these findings, along with Dynamic Cone Penetrometer (DCP) results and site observations, the site was classified as Class H2 in accordance with AS2870, indicating it is subject to very high ground movement due to moisture changes. The residual soil horizon was identified as the preferred founding material for structures, while fill was deemed unsuitable for foundation support without specific remediation measures.

✔ Site Classification Assessment - Chandos Road, Horsley Park NSW