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.

How do I know if my plaster damage is structural?

If the cracks follow the brick joints behind the plaster, if the plaster sounds hollow when tapped, or if the cracks keep coming back after filling — the damage is likely structural. A free assessment confirms what's causing it.

Will replastering fix cracked plaster?

Only if the cause has been fixed first. Replastering over a wall that's still moving or still damp means the new plaster fails the same way. Buildfix plaster wall repair fixes the cause, then finishes the wall.

How long does plaster wall repair take?

Most plaster wall repairs are completed in 1–3 days, depending on whether structural work or damp treatment is needed first. The engineer will confirm the expected timeframe during the free assessment.

Do you handle the plastering or do I need a separate plasterer?

Buildfix handles the full plaster wall repair — structural fix, damp treatment, plaster stripping, rendering, and finish. One team, one quote. No need to coordinate a separate plasterer.

What type of plaster finish do you use?

Breathable gypsum plaster — the right choice for older homes where modern cement render would be too rigid and crack again. For damp-affected walls, a salt-retardant base coat is applied first to prevent residual salts from migrating to the surface.

Can I stay home during plaster wall repair?

Stay home the entire time. The work is done internally with minimal dust and disruption. The technicians work room by room around your schedule.

Is the 20-year warranty transferable if I sell?

Yes. The 20-year product and workmanship warranty is attached to the property, not the owner. If you sell, the warranty transfers automatically.

Plaster Wall Repair

Plaster cracks keep coming back?

Find the cause, fix the structure, and skim-coat your walls for a good-as-new finish. Backed by a 20-year warranty.

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

Trustpilot

Google

Plaster Wall Repair

Plaster cracks keep coming back?

Find the cause, fix the structure, and skim-coat your walls for a good-as-new finish. Backed by a 20-year warranty.

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

Plaster cracks keep coming back?

Find the cause, fix the structure, and skim-coat your walls for a good-as-new finish. Backed by a 20-year warranty.

Free structural assessment with a fixed-price quote
Cracks repaired structurally — plaster finished ready to paint
Backed by a 20-year warranty

Structural Engineers · Licensed Builders · Skilled Technicians

15,000+Homes Repaired

20-YearStructural Warranty

1–2 DaysMost Repairs

Trustpilot

Google

Plaster wall repair — fix the cause, finish the surface.

Non-Invasive. Stronger. Guaranteed.

No need to strip and replaster — save thousands.

If cracks keep coming back and you're thinking about replastering, think again. The wall behind the plaster is moving — no amount of replastering will fix that. This isn't just mending walls. It's reinforcing them permanently.

Neat channels are cut through the plaster, stainless-steel HelicalBars™ bonded into the centre of the brickwork — where it's toughest — and fixed in place. That's it. Most of your existing plaster stays intact.

Our plasterers finish the wall with gypsum plaster — the best finish for older homes. Your walls look new. And you've saved thousands by not having to strip and replaster.

Not sure if your cracks are structural — or just cosmetic? That's exactly what the free assessment answers.

Structural Engineers · Licensed Builders · Skilled Technicians

What to expect

Here’s how we repair your home’s plaster wall cracks, from first visit to warranty.

Buildfix structural engineer assessing cracked plaster wall with tablet

Step 1

Free Structural Assessment

Our structural engineers assess the cracked areas, identify the root cause, and design a tailored repair. Repair details — with photos, markings, and measurements — are created on-site using our mobile software, and the price can usually be explained there and then, so you know exactly where you stand.

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

Step 2

Get Quote and Book

You receive a complete quote package including detailed drawings, repair method statements, and a fixed-price quote — so you’ll know exactly what it’s going to cost. When you’re ready, book through our online portal (takes about 5 minutes) and we’ll organise suitable dates for the work.

Buildfix technician installing stainless steel HelicalBars into mortar joints behind plaster wall

Step 3

HelicalBar™ Installation

On the scheduled day, our technicians arrive and get straight to work — cutting precise slots through the plaster and into the mortar joints behind, then bonding stainless-steel HelicalBars™ with high-strength structural grout. This reconnects the cracked structure at depth, tying separated sections of wall back together so they work as one piece again.

Smooth plaster wall finish after HelicalBar crack repair

Step 4

Replaster & Finish

Once the HelicalBars™ are locked in, we repair the plasterwork over the top. Cracks are filled, surfaces are skimmed smooth, and the wall is left paint-ready. For heritage homes we use gypsum plaster rather than rigid cement render, so the finish is sympathetic to your home's original character. When we pack up, you'd hardly know we were there.

Step 5

Receive Your Warranty

After the work's done and signed off, you'll receive your Completion Package a few days later — a report covering the work carried out, materials used, and images from the process. It also includes your invoice with links to pay through our portal, and your warranty documentation.

See HelicalBar™ plaster wall repair on real homes.

Actual HelicalBar™ projects where cracked plaster walls are left in near perfect condition.

Press the image for a closer look.Click on the image for a closer look.

Heritage room with severe plaster cracking exposing brickwork before and after HelicalBar repair

Cracked plaster around arch window before and after concealed structural repair

Plaster cracks around window frame before and after permanent repair

Hallway wall and ceiling cracks before and after plaster restoration

Internal wall with peeling plaster and ceiling damage before and after repair

Stairwell plaster cracks before and after smooth replastering

Exterior render cracks on building facade before and after repair

Structural fix.
Guaranteed to last.

The benefits of a HelicalBar™ plaster wall repair.

HelicalBars™ are bonded into the centre of the brickwork — where it’s toughest — through neat channels in the plaster. This isn’t just mending the crack. It’s reinforcing the wall permanently, reconnecting the cracked structure so it works as one piece again.

Plastered wall cross-section showing HelicalBar stainless steel bars reinforcing a crack through rendered wall

Ready to fix the cracks for good?

Cracks measured, cause identified, fixed-price quote. It's free.

Structural Engineers · Licensed Builders · Skilled Technicians

Real homes. Real results

See how we’ve helped homeowners fix their plaster wall cracks.

Why choose Buildfix?

Buildfix brings structural engineers, licensed builders, skilled technicians, and the manufacturer together under one roof. For nearly 15 years, Buildfix has 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.

Why homeowners choose Buildfix:

Non-invasive technology. No walls torn open. No replastering over and over. No structural rebuild. You can stay home while the work happens.

Guaranteed. Your repair is backed by a 20-year warranty. If the plaster cracks return, we come back at no cost to you.

One team, diagnosis to repair. Buildfix engineers assess your home and oversee the repair. Buildfix technicians carry it out.

Save thousands — best pricing. All quotes fixed-price. No hidden charges. No surprise costs. If your job goes over, it's on us.

Structural Engineers · Licensed Builders · Skilled Technicians

Watch Video

Learn more about Buildfix and how we fix cracked plaster and internal walls.

Structural Engineers · Licensed Builders · Skilled Technicians

“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 5pm AEST. Give us a call on 1300 854 115.

Plaster cracks keep coming back?

Plaster wall repair — fix the cause, finish the surface.