What We Fix
Sinking Floor Stumps
Stabilise the ground beneath your stumps and level your floors — without ripping up floorboards.
- Free assessment · 1–2 day repair · 20-year warranty
- Structural Engineers · Licensed Builders · Skilled Technicians
Trustpilot
GoogleWhat We Fix
Sinking Floor Stumps
Stabilise the ground beneath your stumps and level your floors — without ripping up floorboards.
- Free quote · 1–2 day repair · 20-year warranty
- Structural Engineers · Licensed Builders · Skilled Technicians
Sinking Floor Stumps
Stabilise the ground beneath your stumps and level your floors — without ripping up floorboards.
- Free structural assessment with a fixed-price quote
- No floorboards removed — most repairs done in 1–2 days
- 20-year product and workmanship warranty
Structural Engineers · Licensed Builders · Skilled Technicians
TrustpilotGoogleAre my floor stumps sinking?
Most stumped homes develop a creak or a slight slope over time. It's usually so gradual you stop noticing — a door that needs more of a push, a table that's always wobbled.
But when the floor starts bouncing underfoot, gaps widen at the skirting, and the slope gets worse — the stumps have moved. Not because they've broken — stumps are simple, durable posts (100mm x 100mm concrete, sometimes timber) sitting on small pad footings. They hold for decades as long as the ground does. When it shifts, the stump drops and loses contact with the bearer above — and a brand-new stump poured onto the same ground will do the same thing.
The signs below will help you work out what your floors are telling you — and whether a structural engineer should take a look.
What are the symptoms of sinking floor stumps?
Your floors tell you when something is wrong. These are the most common signs of sinking stumps.
Sloping or Uneven Floors
Place a ball on the floor. If it rolls, the floor isn’t level. In a stumped home, each stump is an independent post — when one drops more than its neighbour, the bearer between them tilts and the floor follows. The slope is often worst in one section of the house while the rest feels fine. A table that wobbles, a cabinet door that swings open — these are the everyday signs.
Bouncy Floors
Walk across the room and feel the floor flex underfoot. In a stumped home, bearers span between narrow posts — when a stump drops and loses contact, the bearer has further to span unsupported and bows under load. The whole floor seems to shake with each step. Look at the skirting board as you walk past — if it moves up and down, the stump beneath that section has dropped.
Doors Sticking or Jamming
Internal doors are usually the first to go. The outside walls sit on strip footings sunk into the ground — they rarely move. But the floor beneath the internal walls sits on stumps, and when those stumps sink, the floor tilts and twists the door frame out of square. If a door that used to close fine now needs a shove, the stumps beneath it have likely moved.
Gaps Under Walls and Skirting Boards
In a stumped home, the walls and the floor are on separate supports — the walls sit on perimeter footings, the floor sits on stumps. When the stumps sink, the floor drops away from the walls above it. Gaps open at the base of skirting boards and under internal walls. If the gap is wider on one side than the other, the stumps have dropped unevenly.
Visible Gaps Beneath the Floor
If you can get under your home, look at the stumps. A gap between the top of the stump and the bearer above is the clearest sign — the stump has dropped and lost contact. Check for shims, packers, or wedges jammed in the gap — that’s jack and pack, and it means someone has already noticed the movement. If your stumps are timber, look at the base — dark, soft, or crumbling wood means the stump itself may have deteriorated, not just the ground.
What are the signs of sinking floor stumps?
How to fix sinking stumps
Non-Invasive. Laser-Monitored. Guaranteed.
Fix the Ground. Not the Stump.
GeoPoly™ PSR30 resin is injected through coin-sized holes around the affected stumps, filling voids and compacting the soil beneath each stump footing. As it expands, the stump lifts back into contact with the bearer above — slopes level out, doors close properly, gaps close up. Most jobs take 1–2 days.
Restumping achieves the same result — but it means ripping up floorboards, digging out old stumps, and weeks of disruption. GeoPoly™ fixes the ground beneath the stumps — no floorboards removed, no digging, and because the cause is treated, it's permanent.
Not sure whether your stumps need replacing or the ground needs fixing? That's exactly what the free assessment answers.
What to expect
A step-by-step guide of how the sinking stump repair process works — from assessment to completion.
Step 1Free Structural Assessment
A Buildfix engineer inspects your home, gets under the floor, and checks each stump for contact with its bearer. The soil beneath is probed for voids and soft spots. If the stumps are structurally sound but the ground has moved, GeoPoly™ injection is designed to fix it without replacing a single stump. The price can usually be explained on the spot.
Step 2Get Your Quote and Book
A complete quote package arrives — detailed drawings, repair method statement, and a fixed-price quote. The price you see is the price you pay. When you’re ready, book through the online portal and suitable dates are organised for the work.
Step 3GeoPoly™ Injection
Small, coin-sized holes are drilled at precise intervals around the affected stumps. GeoPoly™ resin is injected at depth beneath each stump footing, filling voids and compacting weakened soil — giving your existing stumps the solid base they’ve lost.
Step 4Level and Verify
As the resin expands, each stump is gradually lifted back into contact with the bearer above. Laser levelling equipment tracks every millimetre of movement in real time. The engineer confirms the floors are back towards level before the team leaves.
Step 5Receive Your Warranty
Your 20-year product and workmanship warranty arrives via email with the Completion Package — a job report covering the work, materials, and images.
See the difference
Actual GeoPoly™ floor stump repairs — before and after.
Instant results.
Guaranteed to last.
The benefits of fixing sinking floor stumps with GeoPoly™.
Sinking floor stumps are usually sitting on ground that’s moved — the stumps themselves are fine. GeoPoly™ stabilises the soil beneath each stump and lifts it back into contact with the bearer. Floors level out. Doors close again.
Not sure if it's subsidence? Get your home assessed for free — we'll explain exactly what's going on and what can be done.
Real homes. Real results.
15,000+ homes and structures repaired. Want to see real Buildfix floor stump repairs? Browse a few below.
HomeownerBrighton East, VIC
Stumps Relevelled — No Restumping Needed
The concrete stumps were fine — the soil beneath them wasn’t. GeoPoly™ stabilised the ground and relevelled the floors in two days, saving this homeowner from a second full restumping job.
HomeownerStrathfield, NSW
Heritage Home Repaired Twice, Same Team
When new cracks appeared in this 150-year-old Strathfield home, the owner didn’t hesitate — they called Buildfix again. Buildfix had already fixed the front of the house years earlier. This time, the team tackled the rear.
HomeownerO'Connor, ACT
New Kitchen Saved From a $50k Rebuild
A year after installing a new kitchen, it started pulling away from the wall. Local builders quoted $50,000 to fix it. Buildfix did it in four hours — without touching the kitchen.
HomeownerKings Park, NSW
Jack-and-Pack Failed — Deep-Lift Fixed It
A previous jack-and-pack had failed. The living room floor had sunk 40mm. Buildfix’s deep-lift injection fixed it permanently in a single day — without dismantling a thing.
HomeownerSouthport, QLD
Stumps Raised and Floors Levelled
Sloping floors, cracked tiles, and sunken stumps — this investment property needed to be tenant-ready fast. GeoPoly™ got it done at a fraction of the cost of restumping.
HomeownerPrestons, NSW
Floor Lifted 60mm — Renovation on Track
A broken pipe had eroded the soil beneath this property’s piers, sinking floors by up to 60mm. Buildfix stabilised and relevelled everything in two days — not the two weeks expected.
Ashfield, NSW
Meriton Apartments Re-Levelled
A 40-year-old Meriton apartment complex with 12 apartments suffering uneven floors from sinking brick piers. GeoPoly™ re-levelled all piers in under a day, saving over $300,000 versus traditional rebuild.
Pennant Hills, NSW
Sinking Piers and Verandah Rescued
Emergency repair of sinking brick piers on a 1930s villa in Pennant Hills. GeoPoly™ injection stabilised the verandah and prevented roof collapse — completed in a single day.
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
Questions?
Our team is here to answer any questions you may have Monday – Friday 8am to 4pm AEST. Give us a call on 1300 854 115.
