1. What Counts as Expert Evidence in NCAT

Expert evidence is any opinion or explanation provided by someone with specialised knowledge based on training, study, or experience. In NCAT, expert evidence commonly appears in:

• Building defect reports

• Engineering assessments

• Medical or psychological opinions

• Financial or accounting reports

• Valuations

• Strata and property inspections

• Technical assessments (IT, safety, compliance, etc.)

NCAT accepts expert evidence only when it helps resolve a factual or technical issue.

2. When NCAT Requires Expert Evidence

Expert evidence is typically needed when:

• The dispute involves technical matters (e.g., structural defects, waterproofing, electrical issues)

• A party relies on specialised knowledge to prove a claim

• The Tribunal cannot make findings without expert input

• The law requires expert opinion (e.g., medical evidence in guardianship matters)

In building matters, NCAT almost always expects independent expert reports, not quotes or contractor opinions.

3. NCAT’s Expert Evidence Rules

NCAT follows Procedural Direction 3 – Expert Evidence, which sets out strict requirements for expert reports. Experts must:

• Understand their duty to NCAT

• Provide independent, unbiased opinions

• Clearly state their qualifications

• Identify the questions they were asked to address

• Set out assumptions, facts, and documents relied upon

• Explain their reasoning and methodology

• Acknowledge any limitations in their opinion

• Sign the required NCAT Expert Witness Code of Conduct declaration

Failure to comply can result in the evidence being given little weight — or excluded entirely.

4. Independence Is Critical

NCAT places strong emphasis on independence. Experts must:

• Avoid advocacy

• Avoid taking sides

• Use neutral, factual language

• Disclose any conflicts of interest

• Provide opinions based on accepted principles or standards

Reports that read like submissions or arguments are often rejected.

5. What NCAT Looks For in Expert Reports

NCAT expects expert reports to be:

Clear and Well‑Structured

• Logical sections

• Plain English

• Clear answers to each question

Transparent

• All assumptions listed

• All documents and tests identified

• Limitations openly acknowledged

Evidence‑Based

• Opinions supported by data, standards, or testing

• Reasoning explained step‑by‑step

Compliant

• Includes the NCAT Code of Conduct declaration

• Follows Procedural Direction 3

6. Expert Conferences and Joint Reports

In some matters, NCAT may direct experts to:

• Confer

• Identify areas of agreement and disagreement

• Produce a joint report

• Narrow issues before the hearing

Experts must approach conferences cooperatively and independently — not as advocates for the party who engaged them.

7. Giving Oral Evidence at NCAT

Experts may be required to attend the hearing to:

• Explain their report

• Answer questions from the Tribunal

• Respond to cross‑examination

• Clarify assumptions or methodology

NCAT expects experts to remain calm, factual, and impartial throughout.

8. Common Problems NCAT Identifies in Expert Evidence

• Reports written by contractors rather than qualified experts

• Unsupported conclusions (“in my opinion…”) without reasoning

• Failure to comply with the Code of Conduct

• Advocacy or argumentative tone

• Lack of testing or inadequate investigation

• Opinions outside the expert’s field

• Reports that do not address the actual questions in dispute

These issues significantly reduce the weight NCAT gives to the evidence.

9. Checklist for NCAT‑Compliant Expert Evidence

• [ ] Expert is qualified in the relevant field

• [ ] Report complies with Procedural Direction 3

• [ ] Code of Conduct declaration included

• [ ] Issues and questions clearly identified

• [ ] Assumptions and documents listed

• [ ] Reasoning and methodology explained

• [ ] Opinions supported by evidence

• [ ] Limitations disclosed

• [ ] Neutral, independent tone

• [ ] Expert available for hearing if required

Need an NCAT‑Ready Expert?

Witness.net.au connects you with independent, qualified experts across NSW who understand NCAT’s requirements and produce compliant, persuasive reports.