Engineering Expert Reports: What Municipalities Can Learn from Litigation and Claims Experience

Rising Municipal Liability Pressures

Municipalities across Canada, particularly those managing roads, bridges, and other public infrastructure, confront mounting financial and legal pressures from liability claims. These often stem from accidents or failures where plaintiffs allege negligence in maintenance, design, or warning systems.

A key driver is the intersection of aging infrastructure and intensifying climate impacts. In 2024 alone, insured losses from severe weather reached $8.5 billion, with claims volumes surging dramatically compared to historical averages. Projections indicate that without adaptation, annual climate-related infrastructure costs could rise by billions by century's end, amplifying failure risks and subsequent litigation.

Social inflation has compounded these challenges. Higher public expectations, escalating healthcare costs, and larger jury or settlement awards have driven up liability expenses across public entities. Municipalities increasingly find themselves targeted when infrastructure underperforms during floods, storms, or routine use, leading to claims for personal injuries or property damage.

Engineering expert reports play a central role in these disputes. In road-related claims—among the most common—experts evaluate factors like road conditions, signage, sightlines, collision reconstructions, and adherence to engineering standards. Their analyses, prepared with a duty to the court for objectivity, often determine whether a municipality bears liability or successfully defends itself. Insights from past cases reveal recurring themes, such as inadequate documentation or maintenance, that feed into proactive strategies to mitigate future risks.

Tensions arise between fiscal constraints and legal imperatives. Municipalities balance limited budgets against the need for robust maintenance and documentation to withstand scrutiny in court. Over-reliance on mitigation measures rather than avoidance can prove costly and only partially effective. Meanwhile, insurers like Intact Public Entities highlight how lessons from claims data can inform better practices, though broader systemic issues—like inconsistent provincial land-use policies—allow risky development to persist.

Recent judicial developments underscore the stakes. Decisions have expanded municipal responsibilities, including under occupational health and safety laws, while social inflation trends persist into 2026. The result is a landscape where claims frequency and severity continue upward, pressuring public budgets and insurance markets.