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Underpinning Brisbane

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Underpinning Brisbane

Having troubles with your foundation? Walls cracking, windows jamming? Your foundations may need repair before it gets worse.

Are you looking for reliable underpinning contractors? Brisbane Underpinning Group is dedicated to underpinning foundations of homes right across Brisbane. We have experience with foundation repairs in reactive soils within Brisbane suburbs. We give expert attention to detail releveling to ensure the structural integrity and beauty is restored to your home.

Due to the reactive soils across Brisbane, many properties are more likely to experience some form of settlement in their foundations. There is a need for strengthening the foundations to help stabilise them. Brisbane Underpinning Group can repair the foundations to make your home safe and secure. This allows you to finally complete the cosmetic repairs that last. We pride ourselves in providing the best underpinning services Brisbane has on offer. We use tailored solutions to provide the best outcome for your home.

Read more to find out why you can be another happy client! 

What causes foundation problems?

There are several reasons why foundation repairs are necessary for maintaining the stability of your home. Here are some of the reasons why we’re house underpinning Brisbane:

Cracking in concrete slab in Coorparoo Brisbane caused by faulty foundations

Faults in the original foundation

Due to poor ground preparation as the house was being built, which is one of the construction defects.
non compacted soil is a reason why Brisbane Underpinning Group have been Underpinning Brisbane homes

Reactive soils

Soils may experience subsidence (which is a shrinkage that occurs due to a decrease in moisture content) or heaving (which is the swelling of the soil due to an increase in moisture content).
Excavations nearby footings can cause foundations problems in Brisbane

Nearby excavations

May destabilize the soil supporting the foundation.
Photo shows flooding in Brisbane can cause foundation issues which then require underpinning

Natural disasters

Such as an earthquake or floods which may weaken or moved the existing foundation.
Construction project in Brisbane construction can add extra weight to a building causing foundation issues needing underpinning

Adding weight to the existing building

By constructing a second story to the property, increasing the weight bearing on the existing footings.
A broken water pipe can cause foundation issues that will require underpinning Brisbane homes

Water leaks in the foundation

Which soak and wash away the surrounding soils resulting in a shift or drop in the foundation.
Dry soil which can cause foundation problems in Brisbane (1)

Poorly compacted soils

It usually occurs when a house is built on poorly compacted backfills. As the soil absorbs water, it pushes against the foundation which weakens it.
image of soil in Brisbane that is being dug for underpinning works

Slope failure

which is the movement of the earth downhill. It may be slow movement over the years, known as creep, which can be corrected using underpinning methods. However, the methods tend to be site specific, requiring assessment by an expert.
It is very important to understand the reason for underpinning the property before determining the ideal method for underpinning a house. Mistaking the causes could worsen the problem, complicating the foundation repair efforts. This may lead to an increase in the cost of underpinning a house. For this reason, when slab jacking Brisbane homes that have suffered house subsidence, we start with an inspection by a qualified engineer and order a geotechnical report.

Why do you need underpinning?

Image is of cracks in a house that need underpinning in Adelaide

Cracking in walls and corners of your home

Screw piles used for underpinning Adelaide houses

Windows no longer opening and closing

Photo shows some of the screw piles used by our underpinning contractors in Adelaide

You’ve noticed your floors are not level

Adelaide Underpinning Group working in Tusmore, Adelaide, underpinning a house

Step cracking has occurred in brickwork

Image is of our team underpinning a house in Unley park Adelaide

Gaps expanding around door frames

Image is of equiptment used by our underpinning Adelaide team

Cracks in wall and floor tiles occuring

What is Underpinning?

Underpinning a house is the process of strengthening the foundations of properties that suffer subsurface destabilization — which are movements in the foundation. House subsidence – the sinking of your home’s foundations – is common for properties built on reactive soils like clay, which are mostly unstable due to changes in moisture content.
Underpinning methods are used to increase the bearing capacity of the foundation to withstand destabilization. At times one side or corner of the house may experience more shrinkage or heaving than other parts, affecting the stability of the structure. If it’s subsidence, this will require house lifting techniques to level the foundation of the house.

House underpinning Brisbane foundations is a process that might involve house lifting, and excavation- removal of the surrounding soils – so that it can be replaced with firmer and stable footings, that will withstand underground destabilization, including changes in moisture content.

The techniques for foundation repair work may differ from one property to another and are very often site specific due to different factors. However, when you engage our reputable underpinning specialists, your house is restored to almost its former state, returning the beauty and stability of your property. 

We are on a mission to provide reliable underpinning services Brisbane residents require for property restorations. We will not rest until your house foundation has been repaired.

Does my house need underpinning?

There are various reasons why your house may need underpinning. These include:

If you’re a homeowner looking for a foundation repair contractor, look no further. We offer reliable underpinning services Brisbane properties require against the reactive soil. Call us today.

Underpin & Hold

The underpins are constructed around the existing foundation. Concrete is poured and left to cure, which holds the structure in position, and stops any further movement.

Underpin & Hold

The underpins are constructed around the existing foundation. Concrete is poured and left to cure, which holds the structure in position, and stops any further movement.

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Underpin & Lift

Underpins are constructed around the foundation, followed by house lifting to level the foundation. Concrete is then poured to secure the structure into place

Underpin & Lift

Underpins are constructed around the foundation, followed by house lifting to level the foundation. Concrete is then poured to secure the structure into place

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Concrete Underpinning Vs Resin Underpinning

The Concrete underpinning process involves excavating the soils surrounding segments of the foundation in order to increase its strength (known as load-bearing capacity). After excavation, underpins are constructed and concrete is poured and left to cure before it is loaded with the foundation. As the concrete sets and stronger as it dries, it becomes the new foundation. That will increase the depth of the foundation, and the weight of the house is supported from a firm ground, increasing the stability of the property. 


The technique has been around for over a century, and is considered to be more efficient and cost effective compared to resin underpinning method. For this reason, it is more commonly used in house underpinning Brisbane among other places around Australia.

There are two methods of concrete underpinning which are:

  1. Mass underpinning – is whereby underpins are constructed on weaker segments of the foundation, and poured with concrete to strengthen the load-bearing capacity of the foundation. 
  2. Concrete Pilings – the method uses long steel tubes with a screw head drilled into the ground to reach the firm soil layer. The load is transferred to the firm ground which stabilises the foundation.

On the other hand, resin injection underpinning is a simple method that requires no excavation. The technique involves drilling holes into the ground around the foundation and injecting resin under pressure through the holes. It will expand as it dries, binding all the loose soils around the foundation, making it less reactive. However, this method is less preferred because of its associated high risks. For instance, the resin may block any damaged pipes underground, finding its way through any hairline cracks and filling up pipes. Also, if the method fails to stabilize the foundation, traditional methods of underpinning foundations cannot be used. That’s why traditional underpinning is mostly recommended for Brisbane restorations.

What causes foundation problems?

There are various reasons why foundation problems occur. These include:

Have you noticed any of the following foundation problems?

The cost of underpinning a house is high, depending on the nature of the damage. A faulty foundation worsens over time, and could result in increased underpinning costs, or at worst, a reconstruction project. Here is a better way is to spot the warning signs, and fix them, before it’s too late:

If you notice some of these unusual signs, always carry further investigation before deciding on underpinning methods to use. Contact Brisbane Underpinning Group to inspect the property and determine whether foundation repair is necessary. 

When underpinning foundations, choose reputable underpinning contractors Brisbane homeowners have hired before. We pride ourselves in offering the best underpinning services Brisbane has on offer. In Pullenvale and Ascot, Balmoral and Hamilton, we continue to use our methods that are site specific, and tailored to bring stability in your property. Call us today for a consultation!