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Geotechnical Engineering Services

Slope Stability Assessment

Slope stability assessments are an important determinant of whether ground conditions are suitable to build on, and the type of structures permissible within a nominated building envelope. They are essential for safely managing and mitigating risks associated with natural terrain and engineered slopes.

Our process for slope stability assessments involves:

  • Initial site inspections and data gathering
  • Advanced drone surveying for comprehensive aerial imagery and topographic mapping
  • Detailed geotechnical analysis using industry-leading SLOPE/W software
  • Clear and actionable recommendations for risk management and stabilisation
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When is a Slope Stability Assessment Required?

Slope stability assessments are essential when undertaking projects involving terrain that may pose stability risks. They help ensure the safety, compliance, and structural integrity of your project. Common scenarios requiring an assessment include:

  • Residential, commercial, or infrastructure developments on sloped terrain
  • Projects near steep cliffs, embankments, or excavations
  • Areas prone to erosion or landslip
  • Regulatory or council compliance for high-risk terrain projects
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What’s included?

Each STA Slope Stability Assessment delivers:

  • Detailed geotechnical site investigation
  • Comprehensive aerial drone survey and topographic mapping
  • Advanced slope stability modeling (using SLOPE/W)
  • Factor of Safety calculation under multiple scenarios
  • Customised recommendations for slope stabilisation

Experts in local geology

We have over 30 years’ soil testing experience and complete hundreds of geotechnical investigations every year, giving us a deep understanding of local conditions throughout Queensland and NSW.

NATA lab

With our own NATA accredited laboratory, we thoroughly test and analyse materials. Because we have full control over the testing process, we produce extremely reliable data for every project.

Regional soil profile maps

With decades of data across hundreds of thousands of soil tests, we’ve developed local and regional profiles of soil compositions, along with wind ratings, bushfire assessments, and other ‘site estate specific’ data.

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One engineer for all your needs

Every building project is different, requiring a combination of engineering disciplines. From bottom to top, our engineers can work on soil testing and foundations, all the way up to frame and roof truss design and even inspections. We believe these shouldn’t be thought of as separate, unrelated services.

Whether you’re renovating, extending, building a brand new home, or putting in a pool, you can gain significant benefits from understanding (in advance) the full range of engineering services you might need — and from using the same engineer for all these services.
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Key advantages of integrated services

STA is a one-stop engineer with a service range that delivers three key advantages:

  • Save time and money

Pre-planning your engineering needs means you won’t have to keep re-booking an engineer when you need a particular service. It creates efficiencies that cut service times and save you money by pulling together the services you’ll need, at a lower overall price.

  • Enjoy engineering continuity

With all your engineering done by a single organisation, your consultants tap into a deeper knowledge of the site and the project, which leads to high quality outcomes, with more opportunities for innovative solutions.

  • Less risk, more reliability

While STA always takes legal responsibility for its engineering designs, an up-front engineering services package makes it easier to trust our work with a strong mutual commitment, and reduced risk of potential interruption or delay.

How it works

Engineering consideration – We help you think about your project in engineering terms. What specific services might you need?
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Packaged plan – We develop a plan that packages up all the engineering services you need for your individual home or build project.
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Prescheduled services – With each service pre-scheduled, we can work more closely with you over the life of the project.
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Explore our engineering services

Whether you’re a builder, developer, architect or owner, STA has the size and range to cover every possibility, with a team of experts in every engineering specialty. Explore more specific info on:
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