Underpinning and concrete repair cost guide (Australia)
Realistic Australian price ranges for underpinning and concrete cancer repair in 2025, what drives the cost, and why quotes vary so widely.
Underpinning and concrete repair are quote-driven jobs, so any figure is a guide rather than a price. What you actually pay depends on the method, the soil, how deep stable ground is, access to the site and how much of the house is affected. With that caveat firmly in mind, here are the ranges homeowners are seeing in Australia in 2025, drawn from published contractor pricing, so you can sanity-check a quote rather than be surprised by one.
Indicative price ranges at a glance
Every figure below is an indicative guide, not a quote. Use it to sanity-check a written, inspection-based quote, never as a substitute for one.
| Job | Indicative range | How it is priced / what it suits |
|---|---|---|
| Residential underpinning (common) | $4,000 to $15,000 | Full spread across jobs runs about $3,000 to $25,000 |
| Screw piers / piles | Low thousands each | An average home might need 8 to 10 piers |
| Mass concrete underpinning | $1,500 to $3,000 per metre | Priced by linear metre of wall; suits shallower stable ground |
| Resin injection | Per point or per m2 | Often cheaper and faster for slabs and voids where it suits |
| Major foundation repair (extensive piling) | $40,000 to $80,000+ | Severe, deep-seated movement across much of the footprint |
Underpinning: typical ranges
For a residential job, published guides put a common range from roughly $4,000 to $15,000, with the wider spread across all jobs sitting somewhere between about $3,000 and $25,000. Priced by the pier, steel screw piers or piles commonly run in the low thousands each, and an average home might need eight to ten of them. Mass concrete underpinning is sometimes priced by the linear metre of wall, often around $1,500 to $3,000 per metre. At the severe end, major foundation repairs involving extensive piling can reach $40,000 to $80,000 or more.
Resin injection is usually quoted per injection point or per square metre and is often cheaper and faster than excavation-based methods for the cases it suits, though it is not a fit for every problem.
Concrete cancer repair
Concrete cancer repair is even harder to generalise because the true extent is only known once the concrete is opened up. Small, accessible patches can be modest, but repairs to balconies, facades and car park decks climb quickly once scaffolding or rope access, waterproofing renewal and multiple areas are involved. The honest planning assumption is that a proper repair costs considerably more than a cosmetic patch, and that a low quote which skips steel treatment and waterproofing is usually a false economy that fails within a season or two.
What moves the price, and how to compare quotes
The biggest cost drivers are the depth to stable ground, the reactivity and type of soil, site access for machinery, the number of piers or injection points, and whether waterproofing and drainage need renewing. Because two contractors can propose genuinely different methods, compare quotes on a like-for-like basis: the method, the number of piers or points, the design load, who provides the engineering, and what monitoring is included afterwards. Always start with a structural engineer's report so every contractor is quoting on the same diagnosis, and be wary of any quote given without an inspection.
Common questions
How much does it cost to underpin a house in Australia?
Published 2025 guides put a common residential range at roughly $4,000 to $15,000, with the full spread across jobs from about $3,000 to $25,000, and major piling jobs reaching $40,000 to $80,000 or more. The final price depends on the method, soil, depth to stable ground, access and the extent of movement, so treat any figure as indicative until you have an inspection-based quote.
Why are underpinning quotes so different from each other?
Because contractors may propose different methods for the same house, for example mass concrete versus screw piles versus resin injection, and each carries very different labour, plant and disruption. Getting an engineer's report first, then comparing quotes on the same method, pier count and design load, is the only fair way to compare.
Sources
- Ranges aggregated from published Australian contractor pricing (2025). Indicative only, not a quote.
- CSIRO, Foundation Maintenance and Footing Performance: A Homeowner's Guide (BTF-18)
Prices are indicative guides only, not quotes. Confirm cost and method with a licensed contractor after an inspection.
Ready to get quotes?
Tell us what you are seeing and roughly where the property is. We will match you with a remedial or underpinning contractor serving your area. It is free and there is no obligation.