Using Expert Evidence at the LTB in Ontario

Many Ontario tenants face disputes about repairs, safety, or evictions where expert evidence can make a difference. Expert reports—such as engineering assessments, medical opinions or air-quality tests—can explain technical issues the Landlord and Tenant Board (LTB) might not otherwise understand. This article explains when expert evidence is useful, how to get and prepare reports, what to expect at an LTB hearing, and practical steps tenants can take to keep costs reasonable. It also covers how to submit evidence, disclose reports to the other party, and the kinds of experts commonly accepted by the LTB in Ontario. The aim is to help renters make informed choices and present clear, reliable evidence to support their claims.

What is expert evidence?

Expert evidence means technical or specialist reports or testimony that explain matters like building structure, mold, HVAC, or medical injury. The Landlord and Tenant Board (LTB)^[1] and Ontario law (Residential Tenancies Act, 2006)^[2] allow parties to present expert reports when those facts are central to a dispute.

When expert evidence helps

Expert evidence is often useful in disputes about habitability, health and safety, or the cost and scope of repairs. If your case touches on building safety or health risks, consider an expert early. For background on tenant health and safety obligations, see Health and Safety Issues Every Tenant Should Know When Renting.

• Repairs, structural safety or habitability disputes where a professional inspection clarifies the problem.
• Mold, air-quality or HVAC assessments tied to health or habitability concerns.
• Medical or accessibility opinions that explain how conditions affect a tenant's health or daily living.
• Valuation or damage reports when the amount of loss or cost to repair is disputed.

How to obtain and prepare expert reports

Follow clear steps to produce useful, admissible evidence. If you need additional context about landlord and tenant responsibilities, see Obligations of Landlords and Tenants: Rights and Responsibilities Explained.

1. Contact and hire a qualified, independent expert with experience in the specific issue.
2. Agree the scope, timeline and fee in writing so expectations are clear.
3. Collect supporting documents: photos, receipts, communications and inspection logs.
4. Request a written report that includes facts, methods used, evidence, and clear conclusions.
5. Disclose the report to the other party and to the LTB before the hearing according to filing rules.^[3]

Using expert evidence at the hearing

At the hearing the expert may present the report, be examined by the party who called them, and be cross-examined by the other side. Practical tips:

• Arrange to have the expert available to attend or give sworn evidence at the hearing.
• Make the expert's report concise: clear findings and numbered recommendations help the adjudicator follow the issues.
• Be ready to explain costs; the LTB may order who pays expert fees depending on fairness and results.

FAQ

What kinds of experts are accepted by the LTB?

The LTB accepts professionals such as engineers, property inspectors, medical practitioners and environmental consultants when their expertise is relevant to the issues in the case.

Who typically pays for an expert?

Usually the party who hires the expert pays initially. The LTB can order costs after the hearing; ask the tribunal or a duty counsel about cost claims.

How should I submit an expert report to the LTB?

File the report with the LTB according to the forms and timelines on the official forms page and provide copies to the other party in advance.^[3]

How-To

1. Identify the issue that needs expert proof.
2. Find and hire a qualified expert with clear written terms.
3. Gather and organize supporting evidence and photographs.
4. Obtain a dated, signed written report with findings and conclusions.
5. File and disclose the report to the LTB and the other party before the hearing.

Key Takeaways

• Expert reports clarify technical issues the tribunal may not know about.
• Start early: arranging experts and reports takes time and money.
• Follow LTB filing and disclosure rules to avoid evidence being excluded.

Help and Support / Resources

• Landlord and Tenant Board (Tribunals Ontario)
• Residential Tenancies Act, 2006
• LTB forms and filing information

1. [1] Landlord and Tenant Board (Tribunals Ontario)
2. [2] Residential Tenancies Act, 2006
3. [3] LTB forms and filing information