How to Read a Soil Report: A Homeowner's Guide
A soil report is full of technical detail most homeowners never learn to read — but understanding the key sections helps you engage confidently with your engineer and builder. Here’s what to look for.
Finding Your Site Classification
The most important single piece of information in your soil report is your site’s classification under AS 2870 — usually stated clearly near the front of the report or in an executive summary. This is the letter (A, S, M, H1, H2, E or P) that drives your foundation design, so it’s worth confirming you can find and correctly identify it before moving on to the more technical sections. See our site classification guide for what each rating actually means.
Understanding the Soil Profile
The soil profile section describes what type of material was found at different depths at each test location — clay, sand, fill, rock, and so on. You don’t need to interpret this in engineering detail yourself, but it’s useful to know it exists and broadly what it’s telling you: essentially, a snapshot of what’s actually beneath your specific site at various depths, which your engineer uses directly in their design calculations.
Groundwater Notes
If groundwater was encountered during testing, the report will note the depth at which it was found — relevant to excavation planning, drainage design, and in some cases foundation design itself. Not every site has notable groundwater issues, but where it’s present, it’s worth understanding it’s been factored into your engineer’s recommendations.
Site-Specific Recommendations
Beyond the classification, many soil reports include specific recommendations or flagged considerations — evidence of fill, proximity to trees affecting soil moisture, or other site-specific factors your engineer should account for. These are worth reading closely, since they often explain WHY a particular foundation approach has been recommended, beyond the classification alone.
Questions Worth Asking Your Engineer
If anything in your report is unclear, reasonable questions include: what does my classification mean practically for my foundation design, were any specific issues flagged that I should understand, and how old is this report (and does that matter for my project). A good engineer or soil testing provider should be able to walk you through your specific report in plain language without difficulty.
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Frequently Asked Questions
Do I need to understand every detail in my soil report?
No — the key thing to identify is your site classification; the more technical soil profile detail is primarily for your engineer’s use in the design calculations.
What if my soil report is a few years old?
It’s worth checking with your engineer whether it’s still considered current, particularly if the site has been disturbed or significant time has passed since testing.
Why does my soil report flag nearby trees?
Large trees can draw moisture from soil, affecting reactivity near a foundation — this is a common site-specific factor that engineers account for in design.
Can I request a simpler explanation of my soil report?
Yes — a good testing provider or engineer should be able to explain your report’s key findings in plain language, not just technical jargon.
Is a soil report the same as a geotechnical report?
They’re commonly used interchangeably for residential purposes, both referring to the site-specific soil testing and classification document your engineer needs.
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