How much does foundation repair cost?

Most foundation repairs range from $4,000 to $16,000, depending on the extent of the damage and the size of your property.

How long does the repair take?

Most foundation repairs are completed in just 1-2 days using our GeoPoly™ resin injection method.

What is GeoPoly™ resin injection?

GeoPoly™ is a high-strength expanding resin that we inject beneath your foundation. As it expands, it fills voids, compacts loose soil, and lifts your foundation back to level.

Will you need to dig up my yard?

No! We drill small holes (about 16mm diameter) through your slab or beside your footings, inject the resin, and patch the holes. No excavation required.

What does the 20-year warranty cover?

Our 20-year structural warranty covers the repair work we perform. If any issues arise with the repaired area due to workmanship or materials, we'll fix it at no additional cost.

Is the assessment really free?

Yes, 100% free with no obligation. Our structural engineer will inspect your property, explain the issues, and provide recommendations.

What is restumping, and when is it needed?

Restumping — also called reblocking — is the process of replacing the stumps (posts) that support a raised-floor home. It's traditionally needed when timber or concrete stumps deteriorate, sink into the ground, or shift due to soil movement. Signs include sloping floors, bouncy or springy floorboards, gaps between walls and ceilings, and doors that won't close properly.

How does GeoPoly™ replace traditional restumping?

Instead of jacking up the house and physically replacing every stump, GeoPoly™ resin is injected into the ground beneath your existing stumps and piers. The resin fills voids, compacts weakened soil, and can typically lift the support points back towards level — all controlled with real-time laser monitoring. Your existing stumps stay in place; we fix the ground they're sitting on.

What are the signs that my stumps are sinking?

Common signs include visibly sloping or uneven floors, a bouncy or spongy feeling when you walk across the room, doors and windows that stick or won't latch, gaps appearing between walls and skirting boards, and cracks in internal plaster or external brickwork. If you've noticed any of these, it's worth booking a free structural assessment to check the stump condition.

Is GeoPoly™ cheaper than traditional restumping?

In most cases, yes — often significantly. Traditional restumping involves excavation, temporary jacking, removing old stumps, pouring new concrete piers, and making good the mess afterwards. GeoPoly™ avoids all of that. There's no excavation, no heavy machinery hire, and no landscaping restoration. Every job is quoted individually, but homeowners typically save thousands compared to full restumping.

How long does GeoPoly™ restumping take compared to traditional methods?

Most GeoPoly™ floor re-levelling jobs are completed in a single day. Traditional restumping typically takes one to three weeks depending on the number of stumps being replaced, plus additional time for the site to be cleaned up and landscaping restored. With GeoPoly™, there's no curing time, no excavation to backfill, and no garden to replant.

My home has timber stumps — can GeoPoly™ still help?

Yes. The most common reason timber stumps sink is that the soil beneath them has compacted, washed away, or dried out over time. GeoPoly™ addresses that root cause by filling voids and re-compacting the ground directly beneath the stumps. If the timber itself is rotten or structurally compromised, our engineer will let you know during the free assessment and recommend the best approach.

Can GeoPoly™ fix sinking brick piers and concrete stumps too?

Absolutely. GeoPoly™ works beneath any type of support — timber stumps, concrete stumps, brick piers, or steel posts. The issue is almost always the soil, not the stump material. By stabilising and re-compacting the ground beneath the support point, we can typically restore bearing capacity and help bring the floor back towards level.

What warranty do I get with GeoPoly™ restumping?

Every GeoPoly™ repair is backed by our 20-year warranty, covering both product and workmanship. If anything we've repaired moves again within that time, we come back and make it right. The warranty is attached to the property, so it transfers to the new owner if you sell.

How disruptive is the GeoPoly™ process?

Minimal. There's no excavation, no heavy machinery, and no need to jack up the house or remove floorboards. Our team works from small injection points around the perimeter or beneath the subfloor. You and your family can stay home throughout the process, and in most cases the work is done by the end of the day.

Do I need to move out during the repair?

No. GeoPoly™ injection is non-invasive and carried out from outside or beneath the home. There's no structural demolition, no dust from concrete cutting, and no need to vacate rooms. Most homeowners carry on with their normal routine while the work is being done.

Need Restumping? There's a Better Way.

GeoPoly™ resin injection stabilises the ground beneath your stumps and lifts your floors back towards level — no digging, no replacing stumps. Guaranteed for 20 years.

Free quote · 1–2 day repair · 20-year warranty
Structural Engineers · Licensed Builders · Skilled Technicians

Your Stumps Might Not Need Replacing.

GeoPoly™ resin injection stabilises the ground beneath your stumps and lifts your floors back towards level — no digging, no replacing stumps. Guaranteed for 20 years.

Free structural assessment with a fixed-price quote
Most jobs completed in just one day — no floors ripped up
Backed by a 20-year warranty

Qualified Engineers · Licensed Builders

15,000+Homes Repaired

20-YearStructural Warranty

1–2 DaysMost Repairs

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Your Stumps Might Not Be the Problem.

No Digging. No Replacing Stumps. Guaranteed.

Lift and Relevel — Typically in a Single Day.

Traditional restumping means digging under the house, jacking it up, pulling old stumps out, and pouring new footings — weeks of work, significant cost, and a huge disruption to your daily life. But here's what most restumping quotes don't tell you: the stumps themselves are often fine. It's the ground underneath that's moved.

GeoPoly™ resin injection targets the actual cause. Engineered resin is injected beneath your existing stumps through small access points — filling voids, compacting weakened soil, and lifting your floors back towards level. Real-time laser monitoring controls every millimetre of the lift. No digging, no stump replacement, no floors ripped up.

Most jobs are finished in a single day. Your floors are level, the stumps are sitting on solid ground again, and you've saved thousands compared to traditional restumping. Guaranteed for 20 years.

Not sure if your stumps need replacing or if the ground is the issue? That's exactly what the free assessment answers. Get in touch — no obligation.

What to expect

Here’s how we restump your home, from first visit to warranty.

Buildfix structural engineer assessing floor levels and stump condition with laser equipment

Step 1

Free Structural Assessment

One of our structural engineers inspects the subfloor, checks stump condition, and measures floor levels. If the ground beneath the stumps has moved — rather than the stumps failing — GeoPoly™ injection is designed to fix it without replacing a single stump. The price can usually be explained on the spot.

Buildfix quote package showing structural repair detail, quote cover page, and repair method statement

Step 2

Get Quote and Book

A complete quote package arrives with detailed drawings, method statements, and a fixed-price quote. When you're ready, book through our online portal (takes about 5 minutes) and suitable dates are organised.

Buildfix technicians injecting GeoPoly™ resin beneath house stumps and piers

Step 3

GeoPoly™ Injection

Small injection points are drilled beside or beneath your stumps. GeoPoly™ resin is injected at depth, expanding to fill voids and compact weakened soil — giving your existing stumps the solid base they've lost. Laser monitoring tracks every millimetre of the lift.

Laser monitoring equipment measuring floor re-levelling in real time during restumping alternative repair

Step 4

Level and Verify

Your floors are gradually lifted back towards level. Real-time laser monitoring ensures the lift is precise and controlled. Your engineer confirms the results before the team leaves.

Step 5

Receive Your Warranty

A few days after sign-off, the Completion Package arrives — covering the work carried out, materials used, and images. It includes the invoice and your 20-year warranty documentation.

See the difference

Actual GeoPoly™ projects where stumps are permanently stabilised.

Concrete stump and bearer gap closed after GeoPoly relevelling before and after

Skirting board gap closed after floor re-levelling before and after

Concrete pier stabilised beneath subfloor before and after

Sinking floor lifted back to level at skirting board before and after

Floor gap at wall closed after pier repair before and after

Subfloor pier and bearer re-supported before and after

Sinking pier causing uneven floor repaired before and after

Floor pier settlement corrected before and after

Pier gap closed with GeoPoly resin injection before and after

Sinking floor pier stabilisation before and after

Instant results.
Guaranteed to last.

The benefits of GeoPoly™ restumping.

GeoPoly™ resin is injected beneath your existing stumps to fill voids, compact weakened soil, and lift your floors back towards level. No digging up stumps, no ripping up floors — the existing structure stays in place.

Close-up of stump with GeoPoly resin expanding beneath to re-level floors

Real homes. Real results

See how we’ve helped homeowners fix their stumps.

Why choose Buildfix?

Buildfix brings qualified engineers, licensed builders, skilled trades, and the manufacturer together under one roof. One team accountable for every step — from assessment to final sign-off. For nearly 15 years, we've been delivering non-invasive structural repairs — saving homeowners the hassle and costs of traditional methods. What used to take weeks now takes just 1 to 2 days.

Here's why homeowners choose us

20-year warranty: Every repair is backed by a 20-year warranty — transferable if you sell your home.

Under one roof: We assess, design, repair, and manufacture — no need to deal with multiple contractors, because we handle it start to finish.

Fixed pricing, honest advice: No surprises, no tricks — just one fixed price from the start that never changes.

Non-invasive technology: Every method we use is non-invasive — less mess, less stress, and most repairs done in 1 to 2 days.

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Questions?

We are here to answer any questions you may have Monday – Friday 8am to 4pm AEST. Give us a call on 1300 854 115.

Need Restumping? There's a Better Way.

Your Stumps Might Not Need Replacing.

Don't take our word for it

Your Stumps Might Not Be the Problem.