Construction disputes often come down to technical facts that are difficult to prove without the right expert. Issues like defective concrete, building envelope failures, project delays, and cost-to-complete disputes usually require expert evidence. In BC construction litigation, that evidence is one of the most mismanaged.
Choosing the wrong expert, missing a procedural deadline, or failing to properly instruct your client can seriously hurt an otherwise strong case. This article explains who you need, what courts expect, and how to build and protect a strong expert evidence strategy from the moment a construction dispute arises.
The Legal Framework: What BC Courts Require from Expert Witnesses
In BC Supreme Court proceedings, expert evidence is governed by Part 11 of the Supreme Court Civil Rules, B.C. Reg. 168/2009. An expert’s main duty is to help the court fairly and independently within their area of expertise, not to argue for the side that hired them nor be an advocate. If an expert appears to be acting as an advocate, the court may exclude their evidence or give it little weight.
Threshold Admissibility: The White Burgess Test
Before relying on expert evidence, courts apply the two-step test from the Supreme Court of Canada in White Burgess Langille Inman v Abbott and Haliburton Co, 2015 SCC 23:
First, the proponent bringing forth the evidence must establish the threshold requirements for the evidence to be admissible. Specifically, it must be established that:
- the expert is properly qualified;
- the evidence is not to be excluded by exclusionary rules;
- the evidence being offered is relevant and;
- the evidence necessary to assist the court beyond ordinary experience.
Secondly, this is a discretionary gatekeeping step where the court retains a discretion to exclude even otherwise admissible expert evidence where its prejudicial effect outweighs its probative value.
Their expert report must also comply with Rule 11-6, including by setting out their qualifications, assumptions, documents reviewed, and reasons for the opinion provided. If those requirements are not met, the report may be struck.
Types of Expert Witnesses in Construction Disputes
Different construction disputes require different experts. The key is to match the expert’s training and experience to the issue that needs to be proven.
| Expert Type | Primary Role in Construction Disputes |
|---|---|
| Structural / Civil Engineer | Defective construction, code compliance, cause and extent of structural failure, remediation scope |
| Geotechnical Engineer | Foundation failures, soil conditions, slope instability, subsidence |
| Building Envelope Consultant | Water ingress, envelope failures, cladding defects, moisture damage |
| Architect | Design standard of care, drawing deficiencies, specification errors |
| Quantity Surveyor (PQS) | Cost to complete, cost overruns, value of work in place, lien quantum, payment disputes |
| Project Management / Scheduling Expert | Delay analysis, critical path method, concurrent delay, disruption costs |
| Forensic Accountant | Loss of profits, business interruption, damages quantification |
For example, for cost disputes, including payment claims, lien quantum, and cost-to-complete issues, a Professional Quantity Surveyor (PQS) is often the better fit. A PQS can connect the numbers to contracts, invoices, change orders, and field verification. An appraiser may be helpful for valuing completed buildings but is usually not the right expert for disputed mid-construction costs.
Common Scenarios That Require Expert Evidence
- Defective workmanship or materials: What exactly is defective, what caused it, and what will it cost to remediate?
- Building code non-compliance: Did the work meet the applicable building code and industry standard?
- Delay claims: Who caused the delay, how long was it, and what did it cost the claiming party?
- Lien quantum: What is the fair value of the unpaid work or materials supplied to the project?
- Cost to complete: After contractor abandonment or wrongful termination, what will it cost to finish the project?
- Professional negligence: Did the engineer, architect, or other design professional meet the applicable standard of care?
- Change order and extras disputes: What was the fair value of additional work directed by the owner?
Common Mistakes That Undermine Expert Evidence
Even strong construction claims can become weakened if the expert evidence is not managed carefully. Common mistakes include the following.
- Retaining the expert too late. Expert reports must be served on every party at least 84 days before trial. Experts also need time to review project records, ask questions, and prepare a useful opinion. Retain one early, not after the other side serves its report.
- Coaching the expert. Counsel can point out factual errors or unclear wording but should not pressure an expert to change their opinion. The expert must remain independent, or their report may lose credibility. Communications between counsel and an expert are discoverable, and a coached expert is easily exposed in cross examination, often destroying the credibility of the entire report.
- Using the wrong type of expert for the dispute. An appraiser is not a quantity surveyor, and a general contractor is not a scheduling analyst. Make sure the expert’s qualifications line up with the question the court needs answered.
- Providing the expert with incomplete documentation. An expert opinion is only as strong as the records behind it. Missing contracts, change orders, site reports, emails, or photographs make the report easier to challenge. From the first day of a project, treat your records as if every document may one day be reviewed by an expert in litigation.
- Missing the deadline to challenge the opposing expert. If you want to cross-examine the other side’s expert, you must demand their attendance within 21 days of receiving the expert report. To challenge their qualifications or the admissibility of their report, written notice must be provided to all parties at least 21 days before trial or at the Trial Management Conference.
Key Deadlines Under the BC Supreme Court Civil Rules
The following deadlines apply in ordinary BC Supreme Court actions. Fast-track actions and arbitrations may have different timelines, so it is important to confirm the applicable rules early.
| Action | Deadline |
|---|---|
| Retain your expert | As soon as a dispute arises. Do not wait |
| Expert provides draft report for counsel review | At least 91 days before trial |
| Serve ordinary expert report on all parties | At least 84 days before trial |
| Demand cross-examination of opposing expert | Within 21 days of receiving their report |
| Object to opposing expert’s qualifications or report | 21 days before trial, or at Trial Management Conference (whichever is earlier) |
| Serve responding expert report | At least 42 days before trial |
Practical Advice for Each Type of Party
For Property Owners and Developers
- If a defect or failure appears, photograph and document it right away. Early records are usually more reliable than records reconstructed later.
- If you suspect a structural defect, speak with an independent engineer before repairs begin. Repairs can remove or change important evidence.
- Get legal advice before terminating a contractor. If termination is handled incorrectly, it can lead to significant counterclaims.
For General Contractors
- Start building the expert record early. Daily reports, photos, correspondence, and change orders are the materials experts will rely on later.
- For delay claims, retain a scheduling expert early. Delay analysis depends on the baseline schedule and a complete project record.
- If you are facing a deficiency claim, retain your own engineer. Do not accept the other side’s conclusions about scope, cause, or repair cost without independent review.
For Subcontractors and Material Suppliers
- In lien proceedings, the value of the work or materials is often central. A PQS report can connect the claim to scope, rates, and market standards.
- Do not assume invoices alone will prove value. A qualified expert can explain the pricing, scope, and industry standard behind the claim.
For All Parties
- Let your expert form an independent opinion. Provide all relevant documents, including documents that may be unfavourable.
- Use a clear instruction letter. The expert should know exactly what questions they are being asked to answer.
- Choose someone who is both technically qualified and able to explain their opinion clearly under cross-examination.
How Lindsay Kenney LLP Can Help
Expert evidence often plays a major role in the outcome of construction litigation. Early legal advice can help you choose the right expert, preserve the right records, and avoid procedural mistakes.
Lindsay Kenney LLP’s Construction Law team advises owners, developers, contractors, subcontractors, and suppliers across the Fraser Valley and Greater Vancouver. We can help with:
- Choosing and properly instructing the right expert from the outset of a dispute
- Drafting clear expert instruction letters defining the scope of the opinion required
- Managing expert report deadlines and procedural requirements
- Assessing weaknesses in opposing expert evidence and preparing effective cross-examination strategies
- Preparing experts for examination and cross-examination
- Representing clients in litigation, arbitration, and lien proceedings
- Providing early strategic advice so that you build the strongest possible evidentiary record before litigation begins
If you are involved in a construction dispute, or anticipate one, we encourage you to contact any member of our Construction Law team as early as possible.
In construction litigation, early legal advice is one of the most valuable investments you can make.
This article is intended to be an overview of the law and is for informational purposes only. Readers are cautioned that this article does not constitute legal or professional advice and should not be relied on as such. Rather, readers should obtain specific legal advice in relation to the issues they are facing.
