If you’re planning to build a new home, extend an existing structure, or subdivide land in Western Australia, there’s one critical document you can’t afford to overlook — the Site Classification Report.
This report isn’t just a formality for your building application. It forms the foundation (quite literally) of how your home or building will be designed and constructed. Understanding what it is — and why it matters — can help you make better decisions, avoid costly issues, and ensure your build complies with Australian Standards.
What Is a Site Classification Report?
A Site Classification Report assesses the soil conditions of your land and categorises it according to the likelihood of ground movement due to moisture changes. This classification is crucial for determining the right foundation design for your structure.
In Australia, site classifications follow the AS 2870 Residential Slabs and Footings Standard, and the classification typically falls into categories like:
- Class A – Stable ground (minimal movement)
- Class S – Slightly reactive clay (may require extra footing support)
- Class M, H, E, P – Increasing levels of reactivity or problem soils (e.g., highly reactive clay or filled ground)
Why It Matters for Your Building Project in WA
Western Australia has unique soil conditions, especially in areas around Perth, where sandy, clay, or reactive soils are common. A proper site classification helps:
✅ Determine the correct foundation design
Engineers use the classification to specify slab thickness, footings, and reinforcement, ensuring your structure remains stable over time.
✅ Prevent cracking or movement issues
Getting the footing design right from the start can prevent structural problems like wall cracks, uneven floors, or even major settlement issues later.
✅ Meet council and engineering requirements
Most local councils and certifiers will not approve your plans without a proper geotechnical report, including site classification.
✅ Avoid delays and redesign costs
Starting with accurate soil information means fewer surprises during construction — and no need to redesign or reinforce slabs mid-project.
When Do You Need a Site Classification Report?
You typically need this report when:
- Building a new home or granny flat
- Subdividing land for multiple dwellings
- Extending your home with new footings or slabs
- Applying for building permits or council approval
Even if it’s not explicitly required, it’s still a smart investment for peace of mind.
What’s Included in the Report?
At Logsys Engineering, our site classification report includes:
- Soil sampling and borehole testing
- Site inspection by a qualified engineer
- Soil profile and reactivity analysis
- AS 2870 classification (A, S, M, etc.)
- Recommendations for footing and slab design
- Clear documentation suitable for submission to councils and builders
Get It Right from the Ground Up
At Logsys Engineering Services, we provide fast, reliable, and certified site classification reports across Perth and Western Australia. Our team understands the local ground conditions and delivers documentation that gets your project moving — with no surprises down the line.