NSW building defect case studies: the difference between a claim and an outcome

Quick answer: Published NSW building cases can reveal failures in workmanship, evidence, limitation rules and enforcement. But they cannot, on their own, tell us the percentage of new-build purchasers harmed or the average amount they ultimately recover. The examples below are drawn from NCAT's official 2024–25 annual report and are explicitly identified as owner-commissioned construction disputes, not developer resale cases. Official source, pages 41–43.

Case 1: Sader v Renbar Constructions Pty Ltd [2025] NSWCATCD 47

Core issue: Whether owners could bring new statutory warranty proceedings for alleged defects after earlier litigation involving the building work.

What happened: The owners contracted Renbar to demolish and rebuild their home. Earlier Supreme Court proceedings involving payment and alleged defects concluded in March 2022. In 2024 the owners commenced further NCAT proceedings, seeking $222,315.46 for alleged roof waterproofing, drainage and ensuite leakage defects.

Decision described by NCAT: The tribunal dismissed the claim on the basis that the owners knew or reasonably ought to have known about the defects from expert material in the earlier proceedings. In an alternative consideration of the merits, it indicated the defective roof waterproofing allegation would otherwise have succeeded, and discussed a statutory defence based on whether the builder had provided written advice.

Why it matters: Knowing about a defect in earlier proceedings can limit later warranty claims. An owner may spend time and resources pursuing a problem yet face a procedural legal barrier. This is not an example of an identified SPV or a subsequent purchaser unaware of problems at settlement.

Numbers to avoid misreporting: $222,315.46 was claimed, not awarded or established as actual loss. Actual private legal spending and recovery are not established by the annual report summary.

Earlier detection point: Expert reports in prior proceedings and legal advice on whether all known defects should be raised together.

Source: NCAT Annual Report 2024–25, page 41.

Case 2: Fish v Kurmond Homes Pty Ltd; Kurmond Homes Pty Ltd v Polycrete Australia Pty Ltd [2025] NSWCATCD 6

Core issue: What amount of alleged construction and finishing problems was legally established, and which work caused the damage?

What happened: The owner contracted Kurmond Homes to build a house. Polycrete Australia performed polished concrete finishing under an arrangement involving a variation to the building contract. The owner alleged uneven aggregate, damaged polishing and mortar smears, seeking $415,622.

Decision described by NCAT: The tribunal rejected the aggregate allegation and the brickwork claim. It found that an unsuitable chemical applied to the polished floor by the builder or its cleaning contractor had damaged the finish. NCAT awarded $55,999.19 for grinding, sealing and polishing the damaged surface.

Why it matters: An owner's claimed remediation amount may be dramatically different from a tribunal's findings. The presence of multiple contractors also illustrates why identifying work scope and evidence of causation matters. But the fact an owner claimed a high amount is not proof that the entire claim was meritorious.

Numbers to avoid misreporting: $415,622 sought; $55,999.19 awarded. This is not necessarily the amount actually collected, nor the owner's total out-of-pocket spending.

Earlier detection point: Construction variation records, chemical/product suitability documentation and completed-surface inspection at handover. The official summary does not establish that the problem was discoverable by an ordinary house buyer before a resale.

Source: NCAT Annual Report 2024–25, pages 42–43.

What these two cases establish—and what they don't

How we will publish the broader study

The promised 30–50-case investigation should be based on individual decision texts, linked to associated appeals and costs orders, and ASIC details where company structure is material. It must distinguish confirmed, not established, and unknown for each risk factor; record final orders separately from actual recovery; and separate subsequent purchasers from owners who contracted directly for construction.

Until that work is completed, a site should not publish sample percentages for SPVs, average legal fees or builder accountability as though they were established results. Read the case research method.

Frequently asked questions

Are NCAT building judgments representative of all new homes?

No. Published judgments are selected litigated matters, not a random sample of newly completed properties or all homeowner disputes.

Does the amount claimed tell us how much the defect cost?

No. A claim is an allegation. It may differ from evidence accepted, the amount awarded, actual costs paid and the amount recovered.

Can one building dispute generate multiple decisions?

Yes. Interim decisions, merits decisions, costs decisions and appeals may all arise from one underlying dispute. They must be deduplicated in statistical analysis.

Are there verified SPV cases in these two official summaries?

No. Neither summary establishes an SPV arrangement. We should not infer one from the corporate form of a builder.

Do these cases prove home buyers have no protection?

No. They show that legal rules and evidence determine outcomes, and that purchasers and commissioning owners may face different circumstances. NSW statutory warranties, dispute assistance and insurance can be effective in suitable cases.

Related reading

Data investigation · Developer accountability · What if a builder refuses?.