Building Defect Report Explained
A building defect report is a documented, independent assessment of the defects in a building: what is wrong, what caused it, how serious each defect is, and what it will take to fix. It is the difference between knowing your balcony leaks and having the evidence to prove who is responsible and what the repair involves.
People usually need a building defect report at one of a few moments: nearing the end of a new build’s warranty period, when a strata scheme finds defects in common property, before buying an apartment, or when a defect dispute is heading to NCAT. In each case, the value is the same: an accurate, defensible record of the building’s defects, prepared by someone independent.
This article explains what a building defect report is, what it includes, when you need one, and why an engineer-prepared report tends to carry more weight than a visual inspection alone.
What a Building Defect Report Is
A building defect report records the defects in a building and assesses them. A general building inspection from a visual inspector tells you what can be seen. An engineer-prepared defect report goes further: it identifies the cause, classifies each defect against the Building Code of Australia and the relevant Australian Standards, and sets out the rectification, which matters when money or a dispute rides on the findings.
Reports usually classify the defects in three ways:
- Major defects: serious problems affecting the structure, safety or use of the building, such as structural cracking or a failed waterproofing membrane letting water into the structure.
- Minor defects: smaller issues that need attention but do not threaten the building’s structural integrity.
- Incomplete works: items the builder has not finished to the contract or the standard.
That classification is not just labelling. Whether a defect is major or minor affects warranty periods, who is responsible, and how a matter is treated at NCAT.
What a Building Defect Report Includes
A thorough building defect report covers more than a list of problems.
- Site inspection with photographic evidence: an on-site inspection of the building, documented with photographic evidence, so each defect is recorded and located.
- Defect classification against standards: each defect is assessed against the Building Code of Australia and Australian Standards, and classified as major, minor or incomplete.
- Causes, remedial recommendations and cost estimates: the likely cause of each defect, the recommended remediation, and cost estimates so an owner or owners corporation can budget and act.
Because our reports are engineer-prepared, the remedial recommendations are grounded in how the defect would actually be designed out, rather than a generic note that repairs are required.
When You Need a Building Defect Report
There are a few common triggers.
- End of warranty: before the statutory warranty periods run out on a new build. Under the NSW Home Building Act, these are generally six years for major defects and two years for other defects, so a defect report near those dates protects your right to claim. Confirm your exact dates with a lawyer.
- Strata common-property defects: when an owners corporation finds defects in common property, such as balconies, facades or waterproofing, and needs to document them to pursue the builder or developer.
- Pre-purchase due diligence: buyers of an apartment or home use a building defect report or strata inspection report to understand what they are taking on before they commit.
Building Defect Reports for NCAT and Disputes
When a defect dispute cannot be resolved with the builder, it often ends up at NCAT, the NSW Civil and Administrative Tribunal. A report used in that setting has to meet specific requirements.
- NCAT-ready reports: prepared to the format NCAT expects, with the author acting as an independent expert under the Expert Witness Code of Conduct, not as an advocate for one side.
- The Scott schedule: a table that itemises each defect, the claimed cause, the rectification and the cost, so the tribunal, the parties and their experts can work through them line by line. It is the backbone of a defect claim.
- Expert witness and litigation support: an engineer can provide expert witness reports and attend as an expert if the matter proceeds. See our expert witness reports for the building defects page.
We keep the engineering factual and independent. For the legal side, including whether and how to run a claim, get advice from a construction lawyer.
Why Choose MJ Engineering Projects
- Engineer-prepared, forensic-grade reports: our building defect reports are prepared by engineers, with forensic engineering where the cause is contested, which carries more weight than a visual-only building inspection.
- Registered practitioners with remedial design: the same team that documents the defect can design the rectification, so the report connects to a real fix.
- Support from inspection to rectification: we can take you from the first inspection and defect report through to overseeing the remediation, with one point of contact. A building condition assessment is often the starting point.
Need a building defect report? Contact us with the building and the problem, and we will tell you what is involved.
Frequently Asked Questions
What is a building defect report?
A building defect report is an independent, documented assessment of the defects in a building. It records each defect, classifies it as major, minor or incomplete work against the Building Code of Australia and Australian Standards, explains the likely cause, and recommends the rectification. An engineer-prepared report also ties findings back to a remedial design, which a visual inspection does not.
What does a building defect report include?
It includes a site inspection documented with photographic evidence, each defect classified against the Building Code of Australia and Australian Standards, and the likely cause, recommended remediation and cost estimates for each item. For disputes, it can also include a Scott schedule that itemises the defects, causes, fixes and costs in the format NCAT uses.
How much does a building defect report cost?
It depends on the size and type of building, the number and complexity of the defects, and whether you need an NCAT-ready report with a Scott schedule. There is no fixed price. We scope the work after understanding what the report is for, then quote before anything proceeds.
Do I need an engineer or a building inspector for a defect report?
A visual building inspector can report on the general condition and visible defects. An engineer is the better choice where the cause is structural or contested, where you need defects classified and tied to a remedial design, or where the report may be used at NCAT. For strata, structural or dispute matters, an engineer-prepared report generally carries more weight.
Can a building defect report be used at NCAT?
Yes, if it is prepared to NCAT’s requirements: the author acts as an independent expert under the Expert Witness Code of Conduct, and the defects are set out in a Scott schedule with causes, rectification and costs. The engineering report supports the claim, but the claim itself is a legal matter, so get advice from a construction lawyer.
Contact us about a defect report. If you need an engineer-prepared building defect report for an end-of-warranty claim, a strata defect, a purchase, or an NCAT dispute, MJ Engineering Projects can help. Contact us for an inspection. Call 1800 953 935 or email info@mjengineeringprojects.com.au.
About the Author
MJ Engineering Projects, Remedial Engineers, Sydney
MJ Engineering Projects is a Sydney remedial engineering firm preparing building defect and expert witness reports for owners, strata schemes and their advisers. This article is general information, not legal advice. For the legal side of a defect claim, get advice from a construction lawyer.
