Do You Know The Soil Type of Your New Block?

Do You Know The Soil Type of Your New Block?


What You Need to Know About Soil Types

When deciding to build your dream home, a lot of research goes into the decision. You might have researched the design, different builders in the area and what inclusions you’d like in your home.

But one factor many forget to consider is the soil type of your block.

Finding out the soil type on your block is necessary so that the engineers know the exact requirements of the foundations of your home.

“If the foundations aren’t done properly based on your specific soil type then the foundations may move,” says Stroud Homes Ipswich Salesperson Peter Woolgar.

“This may result in anything from cracking to the house being uninhabitable due to the lack of structural integrity.”

Peter explains everything we need to know about soil, and why we need to know it.

Soil Types – Building Basics with Bryan


How many different soil classes are there?

There are seven main types of soil when talking about foundations:

  • A – Acceptable
  • S – Satisfactory
  • M – Moderately Reactive
  • H1 & H2 Highly Reactive
  • E – Extreme
  • P – Problem Site (Usually due to trees on site)

We allow for an A, S or M class slab as part of our standard inclusions.

Find out more about soil types on the Residential Reports:

CSIRO Foundation Maintenance & Footing Performance: A Homeowner’s Guide


How much does the soil type affect the cost of my home?

An engineered soil test on your block is the only way to find out exactly what soil type you have.

Conducting a soil test is one of the first parts of the preliminary agreement. It’s the main thing that can affect the contract and the pricing of the house. A soil test with Stroud Homes will cost around $480.

Two to three boreholes are drilled (usually 2m down) and soil samples are removed and taken to the laboratory for testing. It typically takes around 5-10 business days to get the results back.

An unfavourable soil test can mean tens of thousands of dollars going into your slab and foundation. This is of course only in the most extreme of circumstances, but it is why we always recommend getting a soil test done as early as possible.


Can I use a neighbouring property’s soil test results?

Unfortunately, a neighbour’s soil test will not be accurate enough for the foundations of your home.

We need to take a soil test directly underneath where your new home will eventually sit. This is because soil runs a lot like wood grain, you and your neighbour could have completely different results.

We have built homes next to each other in the past, and more often then not neighbouring blocks have different soil results!

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Peter Woolgar
Peter Woolgar

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