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Ground Stability Melbourne — Soil & Foundation Stabilisation Specialists

The stability of any structure is directly dependent on the soil it is positioned on, so when that soil shifts (for example, reactive clay that expands and contracts due to weather or seasonal changes, embankment slippage at large properties, or erosion of the soil under a foundation over time) the resulting effect on the stability of any building created on top can be damaging.
At Harman Contracting, we address ground stability issues on a daily basis. We are experts in foundations and underpinning throughout Melbourne, which means we understand the soil type and ground conditions in the city of Melbourne better than the average person. We know how best to provide ground stabilization solutions for residential homes, commercial properties, and public infrastructure throughout Victoria by use of our knowledge, experience, and extensive range of technology.

What Is Ground Stability?

The capacity of earth material beneath and supporting any structure to support the weight of that structure when it stays in a position requires that the foundation soil to be stable. When a foundation has sufficient stability, it prevents any movement of the building and maintains its solidity. Conversely, a loss of foundation stability results in a range of outcomes, from minor cracks to complete failure of a building or structure.
Ground movement can occur over both short periods and also long periods for various reasons. Ground instability can occur at residential properties, commercial buildings, industrial parks, and civil works. Identifying the cause of ground instability is the first step towards correcting the issue appropriately.

What Causes Ground Instability in Melbourne?

  • Reactive clay soils — expanding in wet weather and contracting in dry conditions, placing constant stress on foundations and the ground around them.
  • Leaking pipes and stormwater — water saturating the soil beneath a building softens the ground and washes away fine particles, creating voids beneath foundations.
  • Tree root activity — large trees draw significant moisture from the soil, causing localised shrinkage and ground movement directly beneath and around foundations.
  • Poor drainage — water pooling around a building or running toward foundations gradually destabilises the surrounding soil.
  • Embankment slippage — on sloped sites or larger industrial properties, sections of ground can shift downhill, pulling structures with them.
  • Erosion — soil being gradually washed away from beneath slabs, footings, or paved surfaces creates voids that cause sudden and unpredictable settlement.
  • Fill material settlement — properties built on filled or made ground often experience ongoing settlement as the fill material compresses over time.
  • Neighbouring excavation — construction or excavation work on adjacent properties can disturb the ground and trigger movement on your site.
  • Seismic activity — while less common in Melbourne, minor ground movement events can trigger or accelerate existing instability.

Signs of Ground Instability

  • Cracks appearing in walls, floors, or paved surfaces — particularly diagonal or stair-step cracks.
  • Floors or slabs that have become uneven, sunken, or developed a noticeable slope.
  • Doors and windows that no longer sit square in their frames.
  • Gaps forming between structural elements — walls and ceilings, walls and floors, around window and door frames.
  • Visible erosion, washing away of soil, or voids appearing around foundations or beneath slabs.
  • Retaining walls that are leaning, cracking, or showing signs of movement.
  • Embankment areas that have shifted, settled, or show signs of slippage.
  • Paved surfaces — driveways, paths, car parks — that have cracked or subsided.

Ground Stability Solutions We Provide

Foundation Underpinning — Where ground movement has caused foundation settlement, underpinning stabilises the building by extending its footings down to stable, load-bearing soil. This stops further movement and restores structural integrity to the building above.

Screw Piling — Screw piles are driven through unstable surface soils into the stable ground beneath, providing a reliable load-bearing foundation that bypasses the problem layer entirely. Particularly effective on sites with sandy, loose, or highly variable soils.

Bored Piers — For situations requiring deep ground support, bored piers are drilled to the necessary depth and filled with reinforced concrete. They transfer the building’s load past the unstable soil layer and into stable ground below.

Micropiling — Where access is restricted or conventional equipment can’t reach, micropiling delivers deep ground support in a compact, precise format. Our purpose-built plant allows us to stabilise ground in tight spaces and difficult conditions that other contractors can’t access.

Soil Investigation & Testing — Before recommending any solution, we can arrange soil testing and geotechnical investigation to properly understand the ground conditions on your site. This ensures the solution we recommend is designed for the actual conditions beneath your property — not a generic assumption.

Embankment & Slope Stabilisation — On larger sites where embankment slippage or slope instability is a concern, we carry out stabilisation work to arrest the movement and prevent further erosion or slippage from damaging structures and infrastructure on the site.

Ground Stability for Residential Properties

For homeowners in Melbourne, the primary source of ground instability is foundation movement as a result of having reactive clay substrates found in the area. If you experience dry summer and wet winter weather cycles (or vice versa), then this can cause enough ground movement so that your walls crack, stumps shift from each other or become noticeably uneven; all these issues can happen over the course of one season due to ground instability.
We service all different types of residential properties in and around Melbourne; we work with older homes built on timber stumps through to more modern brick veneer home’s and inner city terrace dwelling types as well. The first step in our service is performing an inspection to determine the cause of ground movement; this means that once we have gained an understanding of what has caused your ground movement issue(s), we are in a position to recommend a suitable remedy. Treating the resultant effect of ground movement without first determining its original cause is only a temporary solution at best.

Ground Stability for Commercial & Industrial Sites

Ground instability at commercial and industrial properties presents significant risks because of how sensitive large construction equipment is to changes in elevation of the floor below them; larger (heavier) buildings put more weight on the ground below them than smaller (lighter) buildings do; and in addition to affecting individual buildings on a wide area of land, any ground shifting, or erosion of soil, due to a shifting embankment can also have an impact on all other structures located around the area

Our expertise includes warehouses, factories, industrial buildings, parking lots, loading docks and all kinds of civil works projects. We understand the technical complexities that are usually associated with commercial-grade geotechnical projects – including engineering issues, project constraints, and the importance to deliver long-lasting, sustainable results (not just short-term solutions).

Melbourne Soils & Why Ground Stability Matters Here

Melbourne’s construction and geotechnical industries have a reputation for having to deal with very difficult soil types, including significant amounts of highly reactive clay, which is found throughout much of the metropolitan area. These clays are some of the most expansive in Australia; therefore their ability to shrink (or swell) with changes in moisture is extreme compared to other areas.
The implication here is that all but the very best designed and constructed foundations in Melbourne will experience some degree of ground movement over their lifespan due to the effects of seasonal cycles of moisture on the underlying clay soils throughout the decades of time they have been in place. Older buildings — those built prior to any clear understanding of soil reactivity or building codes that adequately addressed soil reactivity — are particularly susceptible to issues related to soil reactivity.
Melbourne’s soils are more than just useful information to our industry; they are fundamental to determining how we assess issues pertaining to soil reactivity, solutions to soil reactivity and the performance of Melbourne’s existing stock of buildings.

Why Choose Harman Contracting for Ground Stability Work?

  • Deep knowledge of Melbourne soils — we’ve been working with and around Melbourne’s reactive clay for decades.
  • Full range of stabilisation methods — from conventional underpinning to screw piling, bored piers, and micropiling.
  • Purpose-built equipment — including specialist plant for limited access and tight sites.
  • Engineering certified — all work is backed by proper documentation and certification where required.
  • Residential and commercial experience — we work on everything from single homes to large industrial facilities.
  • Family-run business — honest advice, direct communication, and people who take pride in the quality of their work.
  • Free on-site quotes — no cost, no obligation, just a straight answer about what your site needs.

Frequently Asked Questions — Ground Stability Melbourne

The most common signs are cracking in walls or floors, uneven or sinking surfaces, sticking doors and windows, and visible gaps forming between structural elements. On larger sites, visible erosion, embankment movement, or slippage are also warning signs. If you’re unsure, an inspection will give you a clear picture.
It depends on your policy and the cause of the instability. Some policies cover sudden events like burst pipes that cause ground movement, but gradual soil movement — which accounts for the majority of foundation problems in Melbourne — is typically excluded. It’s worth checking your policy and speaking with your insurer, but in most cases foundation and ground stability repair is an out-of-pocket cost for the property owner.
To some extent, yes. Maintaining good drainage around your property, keeping gutters and downpipes in good working order, managing trees close to the building, and fixing leaking pipes promptly all help reduce the risk of moisture-related ground movement. However, Melbourne’s reactive clay soils mean that some degree of seasonal movement is difficult to avoid entirely — which is why proper foundations designed for local soil conditions are so important.
Stabilising the ground and foundation stops further movement — but the damage that’s already occurred, such as cracked walls or uneven floors, will typically need to be repaired separately once the underlying problem is resolved. We carry out crack repairs and structural repairs alongside our foundation and ground stability work so the whole problem is addressed properly from top to bottom.