Instructing a construction expert witness in Australia

The single most influential decision in a construction dispute is often the choice — and the instructions — of the expert witness. A carefully briefed expert clarifies the case; a poorly briefed one distracts the court and blows out costs. This guide is written for Australian instructing solicitors, insurers, strata committees and property owners preparing to engage a construction, structural, remedial, civil or building practitioner expert.

When to engage

Instruct early. Waiting until pleadings have closed forces the expert to reverse-engineer the theory of the case around the pleadings, rather than shape the pleadings around what the evidence supports. In most construction matters the ideal engagement point is:

• Before the site is altered, cleaned or handed over.
• Before a Scott Schedule is drafted.
• Before pre-litigation notices under the Home Building Act, DBP Act, QBCC Act or equivalent are issued.
• Before a rectification scope is agreed with the builder.

Choosing the right discipline

Construction disputes rarely fall neatly into a single specialty. The most common combinations seen in Australian matters are:

• Structural + remedial for concrete cancer, movement and façade failure.
• Remedial + waterproofing for balcony, planter and wet-area defects in strata buildings.
• Civil / geotechnical + structural for subsidence, retaining wall and stormwater matters.
• Building practitioner + fire for combustible cladding and Class 2 compliance disputes.

Where the matter spans disciplines the standard approach is a lead expert coordinating discipline-specific specialists, with a single integrated report and Scott Schedule presented to the court.

Vetting the expert

• Registration and licensing. RPEQ in Queensland; Registered Design or Building Practitioner in NSW; Registered Building Practitioner in Victoria and WA; CBOS licensed in Tasmania; equivalents in SA, NT and the ACT.
• Professional indemnity. Current, sufficient limit, and not excluding expert witness work.
• Court experience. Number of reports produced, number of matters where cross-examined, and any adverse judicial comment.
• Conflicts. Prior involvement with the parties, the site, the designers or the builder.
• Availability. Capacity to attend site, produce a report within the timetable and appear at hearing.

Drafting the letter of instruction

The instruction letter frames every downstream deliverable. A strong Australian instruction letter typically covers:

• Parties, matter reference and the forum in which the matter is proceeding.
• Reminder of the applicable Expert Witness Code of Conduct and the overriding duty to the court.
• Questions the expert is asked to address, expressed discretely and answerable within the discipline.
• Documents provided, with a full schedule appended.
• Assumed facts — expressly identified, with alternatives where facts are contested.
• The form of report required — standalone report, Scott Schedule contribution, joint expert report or supplementary report.
• Deliverables, timetable, budget and any conferral requirements.

What to expect during the engagement

• An initial scoping conference to confirm the questions, assumptions and documents.
• A site inspection with photographs, measurements and (where required) intrusive investigation.
• A draft report for scope and clarity review — not for opinion editing.
• The final report signed and acknowledged under the Code.
• Attendance at joint experts' conclaves, mediation and hearing as required.

Costs and fee estimates

Reputable Australian experts scope engagements in stages: an initial review and scoping estimate, a firm estimate for the site inspection and draft report, and separate estimates for joint conclave work, supplementary reports and hearing attendance. Requesting a fixed lump sum for the entire engagement before the site has been inspected is not realistic and usually signals a misalignment between expectations and technical reality.

Red flags

• An expert who offers an opinion on the phone before reviewing documents or inspecting site.
• A CV that lists litigation as the primary source of income for many years.
• Reluctance to acknowledge the Code or to disclose prior involvement.
• A refusal to identify the assumed facts underlying opinions.
• Adjective-heavy, advocacy-style drafting in prior reports.