The Cost Of Underpinning Your Home

How Much Does Underpinning Cost in Australia?

The cost of underpinning a house in Australia typically ranges from $3,000 to $25,000 as a general guide. Final pricing depends on factors such as the method used, soil conditions, access to the site, and the extent of foundation damage. Smaller, localised repairs may sit at the lower end, while extensive structural or deep-ground works can exceed this range. Resin injection underpinning is often more affordable and less invasive than traditional concrete methods, where site conditions make it a suitable solution.

As the saying goes, your home is your castle, so you want to be confident in its structural integrity. After all, you’ll likely find yourself in it for many years to come. One of the most important factors that adds to a home’s stability is its foundation. But sometimes foundations need support too, especially if they’ve been laid on soil that has experienced movement or subsidence over time. The results can include cracks in the walls, misaligned windows and unlevel floors.

One of the most effective methods of stabilising the foundations of your home is the process of underpinning. It’s a process that can be expensive, but in broader terms, that cost may be a small price to pay, especially if the alternative is irreparable damage to your home.

So what factors determine the average cost of underpinning a home? Let’s explore further.

How Is the Cost Of Underpinning or Foundation Repair Determined?

When it comes to the cost of underpinning a home, there are numerous points of consideration that must come into play. Those factors include:

• The severity of damage that has occurred – Determining overall underpinning cost depends largely on the nature and extent of the damage to your foundations. In fact, it is the key element that will establish the overall cost of the project. This typically requires a thorough assessment to gain a clearer understanding of the severity of the damage. A general rule of thumb to consider is that the greater the amount of damage to your foundations, the greater the total underpinning foundation cost.
• The root cause of your foundation problems – The foundations of your property can become destabilised by a range of potential causes. Knowing exactly what that cause is will determine the amount of time and resources, and therefore the cost, needed to complete your underpinning project. While Resinject uses the same core machinery across jobs, different root causes may require different injection techniques. And if the underlying issue involves another trade, that’s where additional costs come in. A broken water pipe causing soil washout, for example, would need a plumber to fix the source of the problem before underpinning work can begin. These extra trades and their associated fees can add to the overall project cost.
• The chosen underpinning method – As part of the assessment of your foundations, the structural consultant on site will determine the severity and nature of the damage. They will then select the most appropriate method of underpinning that will best get the job done. The three primary underpinning methods – conventional mass concrete underpinning, screw piers or push piers, and chemical underpinning – all bear different costs. Resin injection and chemical underpinning cost will differ significantly to conventional mass concrete underpinning, for example, as it uses different methods, materials and equipment. The structural consultant will explain the most suitable options for your site so you gain a clearer understanding of the likely underpinning cost.
• Depth of treatment and injection volume – The depth at which resin or other materials need to be injected, the volume of product required, and the number of affected areas all influence the final price. A single localised area of movement will cost less than multiple zones requiring deep ground injection across a larger footprint.
• The experience level of the underpinning professionals – Restoring the stability of the foundations of your property requires qualified and licensed professionals with the necessary skills and knowledge to bring structural integrity back to your home. These professionals can include everyone from geotechnical and structural engineers to the technicians completing the physical underpinning work. The collective expertise of these professionals will also contribute to the cost of underpinning your foundations.
• Your location – The cost of underpinning a house can often depend on the location of the property. Soil types can vary from one location to the next – one suburb might have a higher concentration of sand in their soil, while the next might be more clay-based. The type of soil that your home is built on can determine the necessary underpinning method which, in turn, will likely factor into the cost.
• The size of the house – In addition to the severity of the damage done to your foundations, the overall size of the house will also be a factor. Smaller properties will typically have less foundation area requiring treatment, meaning less time and fewer materials needed for the job, which can reduce the overall project cost. Of course, this is all contingent on the extent of the damage – a smaller property with more damage may end up costing more than a larger property with less damage.

No two homes and no two jobs are the same, which is why the average cost of underpinning a house depends on so many different factors.

Does house insurance cover underpinning?

It’s certainly a fair question, after all it can be an expensive process due to the many factors described above. But the answer to the question ‘is underpinning covered by insurance in Australia?’ is, unfortunately, usually no. Most home insurance policies exclude damage caused by gradual movement, settlement, poor maintenance, or long-term subsidence. In many cases, underpinning itself is not covered, particularly where movement has occurred gradually. Some policies may respond if the damage is linked to an insured event, so homeowners should check their Product Disclosure Statement and contact their insurer directly.

It can’t hurt to consult with your home insurance provider, as each one is typically different to the next in subtle ways, but as a general rule you usually won’t find that you can claim underpinning on your insurance.

What can I do to possibly minimise underpinning costs?

The cost of resin injection and chemical underpinning for your home can be costly – it has to be said. But chemical underpinning can be significantly more cost-effective in suitable applications, often requiring less labour, less excavation, and a shorter installation time. This means not only lower upfront costs but also reduced disruption to your home and daily life. In many cases, it’s a more practical solution while still delivering strong, long-lasting results. And the cost of NOT underpinning your home can be far greater. Ongoing subsidence can cause severe structural damage, leading to repairs that are many times more expensive if the problem is left untreated. Early assessment can reduce repair costs by addressing movement before cracking and slab distortion worsen.

The above factors will almost certainly contribute to determining the cost of the process from beginning to end. There may be some ways you can exercise some control over the costs without compromising on the overall quality of the work.

Conventional underpinning methods, such as traditional concrete underpinning, have a tendency to be quite disruptive and invasive. They often require a degree of excavation to complete the task, and take weeks to complete. This can ultimately make the process an expensive one. Not only are conventional methods financially costly, but they can also consume more of your time than you’d perhaps want. This is because they typically involve reinstatement activities that you as the customer are expected to arrange.

These days, underpinning methods have improved greatly with advancements in technology. Chemical underpinning, for example, can often be completed in a single day for many residential jobs, compared to several weeks for the traditional concrete-based approach. It’s a far less invasive method too, avoiding major excavation.

The best way to keep costs to a minimum as much as possible is to do your research. Find out what you can about the different methods of underpinning your home, what they involve, and what kind of impact the underpinning process may have on your day to day life. Speak to a structural consultant or licensed contractor if you have any questions. Armed with that information, you’ll be able to move forward with the solution that best balances cost-effectiveness with convenience.

So… how much does underpinning cost?

While every home is different, most underpinning jobs in Australia fall between $3,000 and $25,000 as a guide. The total cost depends on several factors, including the size of the property, severity of damage, method used, and how accessible your foundations are. Resin injection underpinning remains one of the most cost-effective options available, often lower in cost than traditional excavation-based methods where resin injection is suitable.

To arrange a free structural assessment and an upfront quote with a licensed and experienced structural technician, contact Resinject today.