Restumping advice
Restumping vs underpinning: what's the difference?
Published
Search “foundation repair Melbourne” and both terms come up constantly, often on the same page, sometimes describing the same job. They are not the same job. Restumping and underpinning fix different problems, on different construction types, for different reasons — and getting the wrong one quoted wastes real money.
The one-line version
Restumping replaces failed timber or concrete stumps under a suspended timber floor. Underpinning transfers the load of a concrete slab down to stable ground below reactive soil. If your house has a timber floor you can hear underneath, you’re in restumping territory. If it’s brick veneer on a concrete slab, restumping isn’t possible — there’s nothing to restump.
That single distinction resolves most of the confusion, and yet it’s the exact mistake we see constantly: a “restumping” quote issued for a slab home in Caroline Springs or Point Cook, suburbs where every house built since the estates went in has been slab-on-ground from day one.
Construction type decides everything
Walk into the subfloor of a pre-1970s weatherboard and you’ll find bearers and joists resting on individual stumps — timber or early concrete — set into the ground with gaps between them. That gap is why the floor sounds hollow when you knock on it, and why a marble rolls if the floor has sagged. This is what restumping addresses: the stumps themselves have rotted, settled, or cracked, and they’re replaced one at a time while the house is jacked back to level.
Walk up to a brick veneer home built after about 1980 and there is no subfloor to speak of — the ground floor is a solid concrete slab poured directly onto (or just above) the earth. There’s nothing underneath to inspect and nothing to “restump”. When this kind of house cracks, the cause is the ground itself moving under the slab, and the fix is underpinning — piers driven down past the zone of soil movement to give the slab something stable to bear on.
Why the confusion happens
Two reasons, and neither is a coincidence.
Both services get marketed under the same umbrella terms — “foundation repair,” “structural repairs,” “house levelling” — because operators who do one often do the other, and broad keywords capture more search traffic. That’s reasonable marketing. It becomes a problem when a suburb page for a slab estate is built by swapping the suburb name into a restumping template without checking what the housing stock actually is. We’ve found exactly this on competitor sites covering suburbs like Melton and Tarneit.
Both produce visually similar symptoms — sloping floors, cracked walls, sticking doors — because both are, at bottom, a structure moving out of level. The visible damage doesn’t tell you which service you need; what’s underneath the floor does.
How to tell which one applies to your house
Three checks, roughly in order of reliability:
- When was it built, and what’s the floor like? Pre-1970s with a timber floor that has any spring or hollowness underfoot — almost certainly stumped. Built from the 1980s onward with a floor that feels completely rigid, especially near external walls — almost certainly slab. This alone resolves it for most houses.
- Look under the house, or at the base of an external wall. A vent or manhole into a dark subfloor space means stumps. A concrete slab visible at ground level with brick sitting directly on it, no gap, means no stumps exist.
- Check the movement pattern. Stump failure is one-directional — it only ever gets worse, and it doesn’t reverse. Slab movement on reactive clay is often seasonal — cracks that widen in a dry summer and partly close after a wet winter point at ground movement, not failed stumps.
If you’re still unsure, that’s what a proper inspection is for, and it costs nothing to ask.
The suburbs, mapped
Melbourne splits fairly cleanly along construction era. The older inner west and inner north — Yarraville, Footscray, Seddon, Brunswick, Coburg — is largely stumped and needs restumping. The western growth corridor and Wyndham estates — Caroline Springs, Melton, Point Cook, Tarneit, Werribee, Hoppers Crossing — is slab-on-ground and needs underpinning. Sunshine sits right on the boundary and can genuinely need either, or both, depending on the specific house.
Why the wrong answer costs you
Beyond the obvious — paying for work that doesn’t fix the actual problem — there’s a subtler cost. A restumping quote for a slab home isn’t just wrong, it signals the contractor never inspected what the house is built on. That’s worth knowing before you sign anything, regardless of which service you end up needing.
Not sure which applies to your place? Send us the suburb and roughly when the house was built, or book a free assessment — we’ll tell you straight, and if it’s the wrong fit for us we’ll say that too.
Common questions
Can a house need both restumping and underpinning?
Yes, and it is more common than people expect on houses that have been extended. An original stumped section at the front and a slab-on-ground extension at the rear are two different structures with two different failure modes, and each needs its own service. It also happens on transitional-era houses and in suburbs like Sunshine that sit on the boundary between Melbourne's stumped and slab housing. The important thing is that the two are assessed together, because re-levelling one section changes its relationship to the other.
How can I tell which one my house needs without paying anyone?
Walk around the outside and look for subfloor vents or an access hatch in the perimeter. If they are there, the house has a suspended timber floor on stumps and restumping is the relevant service. If the brickwork or cladding runs down to a solid concrete edge with no vents, it is slab-on-ground and underpinning is the relevant service. Tapping the floor helps too — a stumped floor sounds hollow, a slab does not. It is a five-minute check and it decides everything that follows.
Is underpinning always more expensive than restumping?
Usually, but not always, and the ranges overlap more than people assume. A full restump commonly runs $11,000 to $22,000, and underpinning $15,000 to $40,000 — but a small underpinning job stabilising one corner can be $8,000, while a large period home with a high stump count and hand-dug access can exceed $30,000 to restump. The more useful comparison is not which service is dearer but which one your house actually needs, because paying for the wrong one is a total loss rather than a saving.
Think this is happening at your place?
We assess before we quote — floor levels measured, cracks mapped, and a straight answer on whether you need work at all. Read more aboutrestumping & reblocking, or get in touch.