Geotechnical Engineering

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At VANN BOMA Engineering, we provide accurate and site-specific Soil Classification Reports to support residential construction projects with confidence and compliance. A lot classification is more than just a formality — it’s a critical step in the design and approval process. Our reports give engineers and builders the insights needed to design suitable foundations, avoid costly surprises, and meet the latest regulatory standards. 

Our team provides prompt and professional reporting that complies with certification requirements and is trusted by engineers, builders, and local certifiers across NSW.

This affordable investigation provides essential peace of mind for your project — reducing the risk of unexpected ground conditions, foundation failures, or cost overruns.

Contact VANN BOMA Engineering today to arrange a site inspection and report tailored to your lot. 

A site or lot classification involves a geotechnical assessment of your property to determine the soil profile and its behaviour under load. This includes identifying key ground conditions that may influence the design of footings, slabs, and overall structural stability.Each report is conducted in accordance with:

• AS 2870-2011 – Residential slabs and footings
• AS 1726-1993 – Geotechnical site investigations 

These standards guide our methodology in testing and classification, ensuring the report is suitable for engineering design and certification. 

Assuming a soil class or deferring classification to on-site inspections is no longer acceptable under current regulations. Structural engineers must reference a current, site-specific soil classification report when finalising plans. Additionally:

• Subdivision-level reports are not compliant for individual lots – especially in new estates or Greenfield developments.

• Building certifiers require the report to be submitted and referenced in engineering documents before issuing a Construction Certificate (CC) or Complying Development Certificate (CDC).
   

Without a compliant report, your project may be delayed or rejected at certification stage.

Our classification reports provide detailed information specific to your lot, including:

• Soil reactivity and movement potential (e.g. Class A, S, M, H, E, P)

• Presence of rock or collapsing/soft ground

• High water table zones or areas prone to saturation

• Tree root zones or organic materials that may impact foundations

• Wind classification, used by structural engineers and frame/truss manufacturers

This information enables accurate foundation design, early identification of construction risks, and improved cost certainty.