Ontario Solicitor Negligence: Professional Liability for Lawyers

The Standard of Care

A solicitor owes a client a duty to exercise the standard of care of a reasonably competent lawyer in the same or similar circumstances. The standard is not that of a specialist unless the lawyer holds themselves out as a specialist in the relevant area. In Central Trust Co v Rafuse [1986] 2 SCR 147, the Supreme Court confirmed that solicitor negligence sounds in both contract and tort, and that the concurrent liability analysis applies — the plaintiff may elect the most advantageous cause of action.

The standard of care is assessed objectively: what would a reasonably competent solicitor have done in the circumstances? Expert evidence from a qualified lawyer in the relevant practice area is typically required to establish both the standard and the breach. Ontario courts have held that the standard:

• Is not perfection — lawyers are not required to be right, only to be competent;
• Includes staying current with the law in the relevant area of practice;
• Requires candid advice about the strengths and weaknesses of the client's position;
• Extends to following the client's instructions unless they are unlawful or involve ethical violations.

Scope of Retainer

The scope of the retainer is a threshold issue in every solicitor negligence claim. A lawyer cannot be liable for failing to advise on matters outside the scope of the work they were retained to do. Ontario courts have held that the scope of retainer is determined by:

• The express terms of the retainer letter or agreement;
• The reasonable expectations of the client based on the nature of the work;
• The subject matter of the file and the lawyer's professional obligations;
• The client's sophistication and the availability of independent legal advice.

In Pickel v Pocklington (1998), 39 OR (3d) 197 (CA), the Court of Appeal held that a lawyer retained solely to register a mortgage was not required to advise on the commercial merits of the underlying loan transaction. However, where the scope is ambiguous, courts tend to construe the retainer broadly in the client's favour.

Practical note: a clear, written retainer letter specifying exactly what work is included — and what is excluded — is the most effective protection against scope-of-retainer disputes.

Causation: But-For and Loss of Chance

The plaintiff must establish that the solicitor's negligence caused the claimed loss. Two causation frameworks apply in Ontario solicitor negligence cases:

Common Heads of Claim

Limitation Periods

The 2-year limitation period under the Limitations Act, 2002 applies to solicitor negligence claims. The clock runs from the date the client discovered (or ought to have discovered) that a claim against the solicitor may exist. This typically requires the client to know:

1. The identity of the solicitor;
2. That loss or damage was suffered;
3. That the loss was caused by an act or omission of the solicitor; and
4. That the act or omission may have been negligent.

The discoverability rule is particularly significant in real estate and will-drafting claims where the defect may not become apparent until years after the lawyer's work was completed. In estate claims, the limitation period does not begin to run against a beneficiary until the beneficiary knows of the will's deficiency.

The 15-year ultimate limitation period under s. 15 of the Limitations Act, 2002 sets an outer bound. Claims more than 15 years after the act or omission are presumptively barred regardless of discoverability.

Damages

Damages in solicitor negligence follow general tort principles of restoration. The plaintiff is entitled to be put in the position they would have been in but for the negligence. Common heads include:

• Lost claim value — the value of the underlying cause of action lost due to the missed limitation period or negligent conduct of proceedings;
• Transaction losses — losses on real estate transactions arising from title defects, improperly registered instruments, or undisclosed encumbrances;
• Consequential losses — foreseeable losses flowing from the breach, including financing costs and carrying costs on a failed transaction;
• Estate losses — the difference between what the beneficiary would have received under a properly drafted will and what they actually received;
• Costs thrown away — legal fees and disbursements wasted on proceedings that were compromised by the solicitor's negligence.

Contributory Negligence

Ontario's Negligence Act allows courts to reduce damages for contributory negligence. Common findings in solicitor negligence cases include:

• Failure to follow the solicitor's advice (where proper advice was given);
• Failure to disclose material information to the solicitor;
• Delay in giving instructions that contributed to the limitation period expiring;
• Failure to review documents before signing.

Practical Protection for Ontario Lawyers

The best defence against a solicitor negligence claim is good practice management:

• Use a written retainer letter on every file specifying the scope of work and exclusions;
• Maintain a reliable tickler/limitation period tracking system — missed deadlines are the single largest source of claims;
• Document all advice given in writing, including risks the client was warned about;
• Follow up unanswered client communications in writing;
• Close files promptly and formally with a reporting letter;
• Carry adequate errors and omissions insurance through LAWPRO (mandatory for Ontario lawyers).