A collapsed retaining wall made of concrete blocks lies beside a road, highlighting the importance of landslide risk assessment.

May 10, 2026

Article Summary

A landslide risk assessment is required in Australia when building on or near sloping land, during Development Applications (DA), or when a site shows signs of instability.

Local councils often mandate geotechnical analysis and environmental risk assessment to ensure safety, compliance, and project approval. These assessments evaluate slope stability, soil conditions, and groundwater behaviour to prevent failures and delays.

What Is a Landslide Risk Assessment?

A landslide risk assessment is a specialist study that evaluates the likelihood and impact of slope failure on a site. It combines geotechnical analysis and environmental risk assessment to determine whether land is safe for development.

We assess how soil, rock, water, and slope conditions interact. This helps identify potential risks such as landslides, erosion, or ground movement.

Key components include:

Geotechnical analysis of soil and rock properties
Slope stability assessment to evaluate failure risks
Environmental risk assessment to understand broader impacts

Slope failure can lead to structural damage, safety hazards, and regulatory issues. Early assessment helps avoid costly outcomes.

Who Needs a Landslide Risk Assessment?

A landslide risk assessment is commonly required across a wide range of projects, particularly where land stability is a concern.

You may need one if you are:

Property developers preparing a Development Application (DA)
Builders working on sloping or uneven sites
Homeowners planning construction or renovations on hills
Managing projects in coastal, escarpment, or landslide-prone areas
Working on sites flagged by council hazard mapping or overlays

If your site has any slope or instability risk, a geotechnical assessment is typically required.

When Is a Landslide Risk Assessment Required?

In Australia, landslide risk assessments are often triggered at key stages of a project.

Common scenarios include:

During Development Applications (DA)
When building on or near slopes
After signs of ground movement, cracking, or erosion
When requested by councils, engineers, or certifiers

These assessments are often linked to broader requirements such as:

Site classification reports
Environmental Management Plans (EMP)

Early engagement helps streamline approvals and reduce delays.

Australian Standards and Council Requirements

Landslide risk assessments in Australia are guided by national standards and local planning controls.

Key considerations include:

Local councils in NSW and across Australia enforce planning rules for slope stability
Development Applications often require supporting geotechnical reports
AS 1726 – Geotechnical Site Investigations provides guidance on soil and site investigations
Many areas are subject to risk-based planning controls, including slope or hazard overlays

Most councils require a geotechnical or landslide risk assessment before approving developments on sloping land. This ensures risks are identified and managed before construction begins.

What Is Landslide Susceptibility Mapping?

Landslide susceptibility mapping identifies areas where landslides are more likely to occur.

It is important to understand the difference:

Susceptibility mapping shows where landslides could happen
Risk assessment evaluates likelihood and consequences for a specific site

These maps often use:

GIS mapping tools
Council hazard overlays

They are used by planners and engineers to guide development decisions and identify high-risk zones.

Key Factors Engineers Assess

A landslide risk assessment considers multiple technical factors to determine site stability.

These include:

Slope stability assessment and gradient analysis
Soil and geological conditions
Groundwater monitoring and drainage patterns
Excavation stability assessment for construction impacts
Site classification under Australian standards

Each factor influences how the land will behave under load, weather conditions, and construction activity.

What’s Involved in a Landslide Risk Assessment?

We follow a structured process to ensure accurate and reliable outcomes.

Typical steps include:

Site inspection to assess visible conditions
Geotechnical analysis of soil and subsurface materials
Slope stability modelling using engineering methods
Risk evaluation based on likelihood and impact
Engineering recommendations to mitigate risks

This process provides clear guidance for safe and compliant development.

Monitoring & Ongoing Risk Management

Landslide risk does not end after initial assessment. Ongoing monitoring is often required.

We support long-term safety through:

Geotechnical monitoring of slope movement
Settlement monitoring to track ground changes
Groundwater monitoring to manage water-related risks
Environmental Risk Management (ERM) strategies

These measures help ensure compliance and reduce the likelihood of future failures.

How to Reduce Landslide Risk

Effective risk mitigation is essential for safe construction and long-term stability.

Common solutions include:

Temporary shoring design to support excavations
Working platform design for safe site access
Drainage and groundwater control systems

These strategies are tailored to site conditions and project requirements, helping reduce risk and improve outcomes.

Why It Matters for Your Project

Failing to address landslide risk can have serious consequences.

Key risks include:

Safety hazards for workers and occupants
Project delays due to approvals or failures
Council compliance issues
Costly structural damage or remediation works

A proactive approach ensures your project stays on track and meets all regulatory requirements.

Need a Landslide Risk Assessment in Australia?

If you're planning a development on a sloping site or your council has requested a geotechnical report, we can help.

We provide:

Landslide risk assessments
Slope stability analysis
Geotechnical investigations

Our team works across NSW and Australia to ensure your project meets all regulatory and safety requirements. Get in touch with Nova Group Pacific to discuss your site and approval requirements.

Frequently Asked Questions (FAQ)

What is a landslide risk assessment?

A landslide risk assessment is a geotechnical evaluation that determines the likelihood of slope failure and the potential impact on people, property, and infrastructure. It typically includes site inspection, soil analysis, slope stability assessment, and risk mitigation recommendations.

When is a landslide risk assessment required in Australia?

A landslide risk assessment is usually required when:

Submitting a Development Application (DA) for sloping land
Building in landslide-prone or coastal areas
Requested by local council or planning authorities
There is evidence of ground movement or instability

Who needs a landslide risk assessment?

You may need a landslide risk assessment if you are:

A property developer seeking council approval
A builder working on a sloped site
A homeowner planning construction or major excavation
Managing land identified in hazard or susceptibility mapping

What is the difference between landslide susceptibility mapping and a risk assessment?

Landslide susceptibility mapping identifies areas where landslides are more likely to occur based on terrain and geological data.
A landslide risk assessment goes further by evaluating the likelihood, consequences, and site-specific risks, along with recommendations for mitigation.