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5 Best Foundation Repair in Sydney (2026)

Independently ranked by our review of ratings, reviews and reputation · How we chose

Brad Smith
By Brad Smith, Home Services Expert · ✓ Data verified July 2026 · 8 min read

A door won't latch anymore, there's a hairline crack running across the cornice, and you're starting to wonder if it's the house settling or something worse. Foundation repair in Sydney is expensive and hard to judge from the outside, but the subsidence specialists here span 611 combined Google reviews and every one of them rates between 4.8 and a perfect 5.0. Only two, though, actually specialise in structural subsidence work rather than general concreting, which matters more than the star rating once you're calling around.

Short answer: Buildfix leads with a perfect 5.0 rating across 217 reviews, backed by structural engineers and a stated 15,000-plus jobs completed. Mainmark Sydney (4.8, 197 reviews) is the other major structural specialist, a global ground engineering company established in 1989. The other three names on this list mostly handle general concreting and driveways rather than structural subsidence repair, worth knowing before you call.
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Who actually does structural repair in Sydney

# Business Rating Reviews Best for
1 Buildfix® 5.0 ★ 217 Overall / structural subsidence repair View ›
2 Mainmark Sydney 4.8 ★ 197 Large-scale or complex re-levelling View ›
3 Raise and Relevel 4.8 ★ 92 Resin injection and re-levelling View ›
4 AMA Concrete 5.0 ★ 60 Driveways and general concreting View ›
5 Australian Concrete Pty Ltd 5.0 ★ 45 Civil-engineer-led concrete work View ›
5 Best Foundation Repair in Sydney (2026)

Our top picks, reviewed

Buildfix® logo
#1 Overall🕑 Open 6 days/wk↩ Responds to reviews

Buildfix®

5.0217 Google reviews

Buildfix runs structural and foundation repair out of a Seven Hills headquarters that also serves as its manufacturing base, sending qualified structural engineers to assess Sydney homes before quoting a fixed price. Its site describes methods including resin injection and helical bar wall crack repair, with most jobs completed in one to two days through small access holes so families can stay in the house. It claims over 15,000 jobs completed.

What people praise

  • Reviewers describe a smooth, well-coordinated process from the engineer's assessment through to the repair crew
  • Named technicians (Mark, Jack, Luke, Lucas) praised repeatedly for clear communication and walking clients through what was done
  • Follow-up support cited even after the original job, including chasing down an unrelated drainage issue at no extra confusion
Reputation scorecardrank in Sydney
Rating5 / 5
Review volume217 · 97th
Confidencehigh
Recency5 weeks ago
Info completenesssite · phone · hours
Rating breakdown98% 5-star
✓ VerifiedSource: Google

Our take: It tops this list on a genuinely rare combination for structural work: a perfect rating held steady across 217 reviews, with reviewers describing the same standard of communication from the first assessment through to handover.

Website+611300854115 Directions

167 Prospect Hwy, Seven Hills NSW 2147

Mainmark Sydney logo
#2🕑 Open 5 days/wk↩ Responds to reviews

Mainmark Sydney

4.8197 Google reviews

Mainmark Sydney is the local arm of a global ground engineering company established in 1989, offering re-levelling, slab lifting, void filling and ground improvement for residential, commercial and infrastructure clients. Its North Sydney office is one of many worldwide, and the firm lists thousands of completed projects globally.

What people praise

  • Praised for lifting a badly sunken concrete slab (over 100mm in one case) back to level after other approaches had failed
  • One reviewer highlighted a technician who turned down billable work because the job fell outside Mainmark's scope, rather than upselling
  • Communication before and during the job described as clear, respectful and free of pressure tactics

Worth knowing

  • At least one reviewer noted the work isn't cheap, which tracks with the scale of equipment and engineering involved
Reputation scorecardrank in Sydney
Rating4.8 / 5
Review volume197 · 92nd
Confidencemoderate
Recency7 weeks ago
Info completenesssite · phone · hours
Rating breakdown93% 5-star
✓ VerifiedSource: Google

Our take: A strong 4.8 across 197 reviews makes it the other clear structural specialist on this list, best suited to bigger or more complex subsidence jobs given its global engineering backing.

Website+611800623312 Directions

Level 7/124 Walker St, North Sydney NSW 2060

Raise and Relevel logo
#3🕑 Open 5 days/wk↩ Responds to reviews

Raise and Relevel

4.892 Google reviews

Raise and Relevel is an Australian subsidence remediation specialist with teams based in Sydney, Melbourne and Queensland, using resin injection, void filling, underpinning and structural grouting to stabilise sinking floors and cracked walls.

What people praise

  • Multiple reviewers describe a quick, efficient process at a reasonable price for relevelling work
  • Technicians praised for walking clients through the results and explaining what had been corrected
Reputation scorecardrank in Sydney
Rating4.8 / 5
Review volume92 · 87th
Confidencemoderate
Recency3 months ago
Info completenesssite · phone · hours
Rating breakdown95% 5-star
✓ VerifiedSource: Google

Our take: A solid 4.8 across 92 reviews. We found one detailed dispute in the public review record between a customer and the company over unrelated property issues following a job; both sides tell very different stories and neither has been independently verified, so we're not treating it as a mark against the workmanship itself, and it doesn't change the strong overall pattern across the rest of the reviews.

Website+611300535410 Directions

Unit 8/6-10 Booralee St, Botany NSW 2019

AMA Concrete logo
#4🕑 Open 7 days↩ Responds to reviews

AMA Concrete

5.060 Google reviews

AMA Concrete is a concrete contractor working on driveways, footpaths and general concreting rather than structural foundation repair specifically. Every review we found describes driveway and concreting work, not subsidence or structural jobs.

What people praise

  • Reviewers consistently praise Abdul and the team for tidy, efficient driveway work at a fair price
  • Multiple customers describe the finished concrete exceeding what they expected going in
Reputation scorecardrank in Sydney
Rating5 / 5
Review volume60 · 82nd
Confidenceearly
Recency7 weeks ago
Info completenesssite · phone · hours
Rating breakdown95% 5-star
✓ VerifiedSource: Google

Our take: Worth knowing upfront: this is a driveway and concreting business, not a foundation or subsidence specialist. It's a fine call if you need a slab poured, but not the right fit for structural cracking or a sinking floor.

Website+61434096709 Directions
Australian Concrete Pty Ltd logo
#5🕑 Open 6 days/wk

Australian Concrete Pty Ltd

5.045 Google reviews

Australian Concrete Pty Ltd is a Sydney concrete and excavation contractor founded by Derek, a licensed civil engineer, working on driveways and slabs for residential and commercial clients, including projects for local councils and NSW government agencies.

What people praise

  • Recent reviewers describe consistently clean, level driveway resurfacing work
  • Civil engineering credentials behind the business, useful context even though its Google reviews focus on driveways rather than structural repair
Reputation scorecardrank in Sydney
Rating5 / 5
Review volume45 · 76th
Confidenceearly
Recency6 weeks ago
Info completenesssite · phone · hours
Rating breakdown100% 5-star
✓ VerifiedSource: Google

Our take: Like AMA Concrete, this business's Google reviews are about driveways and resurfacing, not foundation or subsidence work, even though the founder's engineering background could theoretically extend further. Ask directly if structural work is what you need.

Website+61493397845 Directions
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Watch: 5 Best Foundation Repair in Sydney (2026)

How we score these companies

Rating is each business’s live Google average out of five. Review volume shows how many customers actually left feedback, and a bigger number means a steadier signal than a handful of five-star reviews. Confidence blends rating and volume together. Recency checks how current the reviews are. No business can pay to change these numbers or its position on this list.

What does foundation or subsidence repair cost in Sydney?

Structural repair pricing depends on the cause of movement, the size of the affected area, and the method used, resin injection, underpinning and full re-levelling all sit at very different price points. None of the specialists on this list publish fixed pricing publicly; all offer a free assessment and a fixed-price quote once an engineer has actually looked at the property, which is the honest way to price this kind of work rather than guessing over the phone.

Structural repair across Sydney

Buildfix works from Seven Hills in Western Sydney and covers the metro area plus the Blue Mountains, Newcastle and Canberra. Mainmark operates out of North Sydney with offices worldwide. Raise and Relevel is based in Botany with teams across Sydney, Melbourne and Queensland. Wherever you’re searching from, the Inner West’s Federation cottages, the sandstone-founded eastern suburbs, or Western Sydney’s reactive clay, these firms cover greater Sydney, not just their home suburb.

What to ask before hiring a foundation repair company

  • Will a qualified structural engineer assess the property before I get a quote?
  • Is the quote fixed-price, or can it change once work begins?
  • What method are you proposing, resin injection, underpinning or full re-levelling, and why?
  • How long will the repair take, and will we need to move out?
  • What warranty or guarantee comes with the completed work?
  • Can you show before-and-after documentation from a similar job?

Frequently asked questions

Are these rankings paid?

No. Rankings come from public Google data. A business can pay to be a Featured Partner, which gets it a badge and top placement, but that never changes another business’s score or position.

How did you choose these five businesses?

We compared foundation repair and subsidence specialists in Sydney with a real Google track record and ranked them on rating, review volume, and how recent the feedback is. We’ve also flagged where a listed business is really a general concrete contractor rather than a structural specialist.

How often is this updated?

This page reflects Google data verified in July 2026. We recheck rankings periodically as ratings and review counts shift.

How do I know if I actually have a foundation problem?

Common signs include doors or windows that stick, cracks running diagonally from door or window frames, and floors that feel uneven. A structural engineer’s assessment is the only way to confirm the cause.

Is a concrete contractor the same as a foundation repair specialist?

No. A concrete contractor pours and finishes slabs and driveways. Foundation repair for subsidence or structural movement is a different trade, usually involving engineers and specialised methods like resin injection or underpinning.

The bottom line

For genuine structural or subsidence work, Buildfix is the safest default, backed by the strongest and most consistent review record on this list. If you just need a driveway or slab poured, AMA Concrete or Australian Concrete are solid choices, but they’re not the businesses to call for a cracked wall or a sinking floor.

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