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Resin Injection – The Modern Underpinning Alternative

The Cost Of Underpinning in 2025

Underpinning is a critical solution for addressing sinking foundations, cracked walls, and subsidence issues. It restores the structural integrity of your home.

However, the cost of underpinning can vary significantly depending on the method used, the extent of damage, and several other factors.

Here’s a breakdown of what you need to know about underpinning costs, including modern alternatives like resin injection technology.

Resin underpinning is generally more cost-effective compared to traditional methods due to its efficiency and lower labour requirements. You can expect the average residential underpinning job cost to be anywhere between $4,000 and $15,000*. 

 

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Founded in 1989, Mainmark pioneered Resin Injection technology in Australia.

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The Cost of Underpinning and Foundation Repairs for Your Home
Severity of Foundation Damage

The extent of the damage to your foundation plays a significant role in determining the overall cost of underpinning. Foundations suffering from major cracks or severe sinking will likely require more comprehensive and expensive solutions.

Cause of Foundation Problems

The root cause of the foundation issues, such as soil settlement or tree root intrusion, will influence the cost of the project. Different causes require different approaches and equipment, which can increase the cost.

Underpinning Method

There are several underpinning methods, such as mass concrete underpinning, screw piers, and resin injection. The choice of method will significantly affect the cost. For example,  underpinning using resin injection is typically faster,  less invasive and more cost-effective compared to traditional methods.

Accessibility to Foundations

The ease of access to your home’s foundations is another cost factor. If the foundation is difficult to reach, it could prolong the process and limit the methods available, leading to increased costs.

Location and Soil Type

The geographical location of your home and the type of soil it sits on also impact underpinning costs. Properties built on unstable soil types, like clay, may require more complex underpinning solutions, which can increase the price.

Size of the House

Larger homes with more extensive foundations will naturally incur higher underpinning costs. Conversely, smaller properties may be less expensive to underpin, provided the damage is not severe.

Typical Costs of Underpinning

The average cost of underpinning a house in Australia varies.

The final price will depend on the abovementioned factors, including the property size and the damage’s extent.

Resin injection underpinning is typically more cost-effective compared to traditional methods, and it can often be completed within a day, making it a popular choice for homeowners looking for a quick and efficient solution.

The cost of underpinning varies based on factors like the method used, soil conditions, and project size. Here’s a general breakdown:

  • Mass Concrete Underpinning: $1,000 – $3,000 per meter.
  • Beam and Base Underpinning: $1,500 – $3,500 per meter.
  • Mini-Piled Underpinning: $10,000 – $20,000 per pile (depending on depth).
  • Resin Injection: The cost of underpinning a house using resin injection varies based on the size of the property and the extent of foundation damage.However, resin underpinning is generally more cost-effective compared to traditional methods due to its efficiency and lower labour requirements.

 

Resin Injection Underpinning Information
Resin Injection Underpinning

The modern resin injection alternative method of underpinning uses a very different approach to the traditional methods. It uses a precise process to deliver an expanding polyurethane resin into the ground through small injection tubes. The position of the injection tubes will be tailored to the nature of the underpinning needed for each project.

After being injected into the ground, the resin expands and hardens to fill any voids and strengthens the ground. Controlled injection of further resin can then be used to return the building to the required level.

Resin injection process is non-disruptive and fast, with the work on a typical house taking on average one day. However, it may only be suitable for some applications, but as the method with the lowest typical cost is worthy of consideration when looking for alternatives to the more disruptive and time-consuming traditional underpinning methods.

Mainmark provides underpinning services in Sydney, Melbourne, Brisbane, Perth, Adelaide, Canberra, Hobart, Tasmania, NSW, Queensland, Victoria, South Australia, Western Australia.

Mainmark also provide the following in Australia:   wall crack repairs, sinking floor repair, Concrete slab repair, sinking foundation repair, underpinning, ground improvement, re-levelling, subsidence repair, void filling and slab lifting

Chemical Underpinning

Chemical underpinning, also referred to as resin injection and is an innovative non-invasive solution used to provide ground improvement and enhance the load-bearing capacity of a structure’s foundation.

This method is particularly useful in situations where the foundation soil has insufficient strength or when the soil’s characteristics have changed over time, reducing its ability to support a structure.

Will Insurance Cover Underpinning Costs?

Underpinning is often considered a preventive measure, meaning it’s usually not covered by home insurance policies in Australia.

Most insurance providers exclude underpinning from coverage since it aims to prevent further damage rather than repair existing issues.

It’s always worth consulting with your insurance provider for clarification on your specific policy.

Minimising Underpinning Costs

While underpinning can be costly, it is possible to minimise expenses by choosing modern, efficient methods like resin injection underpinning.

This technique reduces the need for excavation and long project durations, which can help lower labour and material costs.

Doing thorough research and consulting with professionals will also help you make an informed decision that balances cost and effectiveness.

Get a Quote for Underpinning

To get a clear idea of the cost of underpinning your home, it’s best to arrange a professional inspection.

For more information or to schedule a FREE inspection, get in touch with Mainmark today.

Our experienced team will provide a customised solution to restore your home’s structural integrity.

The Cost of Underpinning Quote

Arrange a site assessment in 3 simple steps:

Step 1

Submit your enquiry using our online form. Include a brief message about the type of foundation issues you are experiencing.

Step 2

Our friendly customer service team will be in touch to schedule a site assessment that suits you.

Step 3

One of the Mainmark experts will visit your home or property, assess the damage, and ascertain the likely cause. They will establish the approach needed, creating a plan specific to the needs of your building and provide you with a detailed quote.

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