Restumping in Kangaroo Flat

Kangaroo Flat is three suburbs in one, and the first thing to establish isn’t what’s wrong with your house — it’s whether it has stumps at all.

Goldfields cottages, post-war homes and modern slab estates all sit inside this postcode. They fail differently, they cost different amounts, and one of them can’t be restumped under any circumstances.

Three housing generations, three different problems

[[VERIFY — the three-generation characterisation and roughly where each sits. Source from City of Greater Bendigo planning and heritage material, census dwelling-age data, or subdivision records before publishing. This block is the page’s foundation.]]

Most Bendigo suburbs are one thing. Long Gully is goldfields housing. Maiden Gully is modern estates. Kangaroo Flat is all of it, because it started as a gold-era settlement and then kept growing through every subsequent phase of Bendigo’s development.

Generation	What’s underneath	What it needs
Gold-era 1850s–1910s	Original timber stumps, 110–170 years in clay. Low subfloor clearance	Restumping, or jack and pack if the stumps are sound
Post-war 1950s–1970s	Second-generation stumps, often concrete, now reaching end of life. Better clearance	Partial or full restumping. Frequently the sweet spot for jack and pack
Modern estates 1980s onward	Concrete slab on ground. No stumps, no subfloor	Underpinning or resin injection only

The gap between the cheapest and dearest of those is roughly tenfold, and it’s decided by which street you’re on before anyone looks at your house.

Working out which one you've got

Two minutes, no tools, and it determines everything that follows.

Look for subfloor vents. Small grilles or airbricks low down on the external walls, usually just above ground level. Vents mean a subfloor, which means stumps. No vents anywhere means a slab.
Look for a step up at the front door. Houses on stumps sit above ground level. Slab homes sit close to it.
Tap the floor, or lift a corner of carpet in a wardrobe. Timber boards mean a suspended floor. Concrete means a slab, whatever the covering is.
Check for a manhole or crawl-space access — usually under the house externally, occasionally inside a cupboard.
Roughly when was it built? Pre-1980 in Bendigo is usually stumps. Post-1980 is usually a slab. Not a rule, but a strong indicator.

If you have a slab: restumping, reblocking and jack and pack are all impossible. Your options are underpinning or resin injection, and the mechanism is usually ground moisture or fill rather than anything structural. Cut-and-fill platforms and estate housing →

If you have stumps: all options are live, and the next question is their condition and age.

If it’s both — original house on stumps with a slab extension, which is common here — you have two structures with different foundations, and they move independently. That needs both assessed.

Where the generations meet

The interesting cases in Kangaroo Flat are the houses that straddle two eras, and there are more of them than you’d expect in a suburb that’s been infilled and extended for 170 years.

A gold-era cottage with a 1970s addition. Original timber stumps under the front, later concrete stumps under the back. Two stump generations settling at different rates, which means the house keeps going out of level however often it’s corrected — because structurally it’s two houses. Levelling treats the symptom. Why mixed stump materials cause ongoing problems →

A post-war house with a modern slab extension. Suspended timber floor meeting a concrete slab. The timber section moves with its stumps; the slab moves with the ground. Cracking concentrates at the junction, and it’s frequently misread as a defect in the join rather than differential movement.

A house that’s been part-restumped. Very common on the older stock. Someone did the worst side decades ago and left the rest. What’s under it now is a mix, and a partial repeat produces a third generation of the same problem.

In every one of those cases, the useful question to a quoting contractor is: what are you not touching, and how long has it got?

What's most likely moving yours

Sorted by generation, because the answer genuinely differs.

Gold-era housing:

Stumps at end of life — original timber failing at ground line. The most common answer on this stock by a wide margin. Restumping →
Water arriving somewhere it shouldn’t — downpipe beside the house, cracked stormwater, ground falling towards a wall. Cheapest fix on the list. Drainage and subfloor →
Joists rather than stumps, if the floor springs instead of sagging. Bouncy floorboards →

Post-war housing:

Second-generation stumps reaching end of life — 50 to 75 years in, which is genuinely the age at which this becomes live.
Sound stumps with a settled house — the classic jack and pack case, and a fraction of the cost of restumping.
Blocked subfloor ventilation from later additions and built-up garden beds.

Modern slab housing:

Moisture change around the slab perimeter — the most common cause and the cheapest to address.
Inadequately compacted fill consolidating under part of the slab. [[VERIFY — whether modern Kangaroo Flat estates involved cut and fill. If confirmed, reference the Maiden Gully page rather than rebuilding the explanation here.]]
Seasonal clay movement — Bendigo’s deep-movement classifications mean the moisture cycle reaches further into the profile than it does in Melbourne.

What it costs in Kangaroo Flat

Three Different Starting Points for Foundation Repairs

The right repair depends on what is actually failing beneath the home. Restumping, stump adjustments, underpinning and drainage work solve different problems, which is why there is no single “average” repair cost.

Jack and pack — typically around $500 to $2,500 for localised adjustments, depending on the number of stumps affected, access underneath the home and whether additional repairs are required. Most commonly used where existing stumps are still structurally sound but require levelling adjustments.
Per stump, installed — around $280 to $550
Full restump — typically $12,000 to $30,000
Underpinning — typically $15,000 to $40,000+, at roughly $1,200 to $2,500 per pier. This is a different structural solution generally used where the issue involves foundation support rather than deteriorated stumps.
Drainage and ventilation work — hundreds rather than thousands, and frequently the whole answer

Cost Factors That Change Between Housing Types

Gold-era cottages often have lower subfloor clearance and tighter access, which can increase labour costs. Post-war homes are generally easier to access underneath, making some repairs more straightforward. Slab homes remove the subfloor question entirely but have fewer low-cost adjustment options because there are no stumps to repair or pack.

Full cost breakdown, and the nine questions to ask any quote →

Start with what your house sits on

Five questions — what you’re seeing, what the house sits on, roughly when it was built, why you’re looking into it now, and how to reach you. If you’re not sure whether you’ve got stumps or a slab, say so; that’s a normal answer and it’s the first thing worth settling.