Underpinning house solutions

Get your personalised quote for resin injection underpinning in 3 simple steps:

Step 1:

Submit your enquiry using our online form. Include a brief message on 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:

The Mainmark team of 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 for the cost of resin injection.

Why take it from us, read what our customers have to say :

Customer Testimonials

Process of underpinning a house using resin injection

Mainmark uses a 2 in 1 non-invasive underpinning solution which not only strengthens the ground under the foundation but lifts the structure back to level. As the building moves back to its original position wall cracks generally close, leaving only cosmetic crack repair, such as patching and painting, to deal with. Structural damage is resolved, and the aesthetics of the building is re-newed.

computer screen with Typical signs of subsidence

Want to learn more about the signs of subsidence?

Explore our interactive house and view typical subsidence problems around your home

Sinking floors, paths and driveway slabs, cracked walls, jamming doors and windows can all be indicators of structural damage due to subsidence and voids under the ground. Typical causes are unstable or weak ground, a broken pipe causing soil erosion, moisture changes in clay soil, nearby building and excavation works, and seismic activity or liquefaction. Our solutions are cutting edge and the modern answer to the traditional way to underpin; they are like keyhole surgery compared to concrete underpinning. Our alternatives to underpinning are not just for concrete slab floors. We can underpin, raise and re-level strip footings and raft slabs, plus we can infill under slabs and driveways.

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Underpinning foundation methods

When it comes to foundation repair, underpinning has been the method of choice for many years. Compared with traditional concrete underpinning, Mainmark’s underpinnings are fast, clean, reliable, cost-effective, and non-intrusive. They are modern, non-invasive alternatives to traditional underpinning techniques and are like keyhole surgery for your building or home.

Our Teretek resin injection solution achieves re-levelling faster and typically more cost-effective than concrete underpinning. On average, we can raise your home back to level as little as a day or within one or two weeks depending on the technologies we use, compared to the many weeks usually required for concrete underpinning. Also, with resin injection, there is no mess: it doesn’t require major excavation, water, cement, or concrete. For larger homes and buildings, we can use our JOG method which is a computerised system of cement grout injection. It enables pin-point level correction of more complex, large and heavy-weight structures.

Importantly, you usually don’t need to vacate the premises. Unlike concrete underpinning, which requires extensive excavation and digging, our Teretek resin injection solution doesn’t require invasive work. Any internal work required, uses minuscule holes (as little as 6mm in diameter) which can be drilled between tiles and even through carpet, and furniture doesn’t usually need to be moved.

Concrete underpinning should be avoided to address subsidence in poor ground conditions such as non-cohesive, sandy, or muddy soil, or poorly-compacted fill. The reason being that the added weight of concrete can make the situation worse. Instead, the Mainmark underpinning method delivers the correct specific rigidity to avoid further damage.

Cost of underpinning a house

As well as being more convenient, safer, and more reliable, our Teretek engineered resin injection solution is typically less than half the cost of traditional concrete underpinning.

However, the actual cost of underpinning will depend on many factors, including:

  • your location
  • the actual cause of the problem
  • the nature and condition of the foundation soil
  • the type and profile of the building footings
  • the surroundings e.g. access to the site, adjacent buildings or retaining walls
  • unknown or unforeseeable underground conditions
  • the volume of material that will be required
  • the time that the work will take.

If only one small corner of the house needs re-levelling, then concrete underpinning may be cheaper, but it may also give rise to additional challenges. For example, new cracks can develop in the house if only one part of the foundation is concrete underpinned.

In most cases, the cost of the resin injection will be lower than other methods, particularly concrete underpinning.

Get a FREE site assessment and see how much you can save with Mainmark.

(AU) 1800 623 312 | (NZ) 0800 873 835


The materials we inject have been specifically engineered to resist shrinkage or deterioration causing significant settlement. As such, our Teretek engineered resin is warranted by Mainmark for 50-years, in strict accordance with the product durability requirements of the applicable local, state or national Building Code.

Locations we service

Mainmark offers comprehensive Teretek resin injection foundation repair services across Australia and New Zealand.
Click on the pinpoints around the map to see how we have assisted customers with their geotechnical and asset preservation needs:

Perth: The soil in Perth varies. Mainmark has been underpinning Perth homes for many years, overcoming subsidence issues.

Adelaide: Mainmark has been underpinning Adelaide buildings for many years. In South Australia, underpinning is critical since many of Adelaide’s buildings sit on concrete slabs, or concrete strip footings.

Melbourne: We provide reliable foundation repair and house underpinning across Melbourne, addressing issues caused by prolonged drought.

Mildura and regional Victoria: Many Victorian houses are built on concrete. Mildura is no exception, making it a key location for Mainmark’s underpinning method.

Hobart and Launceston: Tasmanian homes have been known to suffer from subsidence and can be addressed quickly and reliably by Mainmark’s underpinning method.

Sydney: It is common for homes in the Sydney area to require underpinning due to a mixture of high drought and heavy rain fall seasons causing ground subsidence. Mainmark has successfully raised and re-levelled hundreds of Sydney homes and driveways.

Newcastle and Cardiff: Drought and excessive rain, as well as Newcastle’s famous earthquake have contributed to a need for house raising. Mainmark offers reliable house re-levelling and raising in Newcastle and Cardiff.

Brisbane, the Gold Coast, and the Sunshine Coast: Mainmark has been underpinning Brisbane and south-east Queensland homes for decades. Underpinning Gold Coast and Sunshine Coast homes is critical due to the sandy soils.

Mackay, Townsville, Cairns and Far North Queensland: When it comes to house raising, Townsville and other regions of FNQ require significant underpinning due to extended periods of rain and drought.

Auckland and Wellington: We’ve been underpinning Auckland homes for many years and have extensive experience across the North Island.

Christchurch and Kaikoura: Mainmark have helped thousands of Christchurch homes and buildings, affected by the earthquakes, with level correction and ground strengthening.