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Professional liability insurance for the work clients rely on.

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Reviewed August 30, 2026Sources Insurance Bureau of Canada; Registered Insurance Brokers of Ontario

On this page
  1. Professional work can create financial-loss claims
  2. Professional and general liability are different
  3. What to compare in an E&O or professional-liability proposal
  4. Protect the claims-made timeline
  5. Contracts can exceed the insurance
  6. Information insurers commonly request

Professional work can create financial-loss claims

A client may allege that advice, design, documentation or a service was negligent, late or incomplete. Professional liability insurance—often called errors and omissions or E&O—can address covered allegations and defence costs, subject to the policy.

The professional services definition is central. It should describe what the firm actually does, including newer services, subcontracted work and projects outside Ontario.

Professional and general liability are different

Commercial general liability is primarily concerned with covered bodily injury and property damage. Professional liability is designed for specified errors in advice or services that may cause a client’s financial loss. Some events can raise both questions, but one policy should not be assumed to replace the other.

Media, cyber, intellectual-property, pollution and bodily injury arising from professional services may require tailored wording.

What to compare in an E&O or professional-liability proposal

Professional liability and errors and omissions (E&O) are two common names for this coverage family. The terminology and form vary by profession, but the review should address:

  • Whether the professional-services definition includes every revenue-generating service
  • Which employees, contractors, predecessors and subsidiaries qualify as insureds
  • Whether defence costs reduce the limit
  • Contractual-liability, intellectual-property, privacy or media provisions
  • Territorial limits and exclusions for warranties, estimates or performance guarantees
  • Consent-to-settle terms and any resulting co-insurance provision

Technology firms may see the term “technology E&O,” while regulated professions may use profession-specific forms. The label does not replace a comparison of the actual wording.

Protect the claims-made timeline

Many professional liability policies are written on a claims-made basis. The claim must meet the reporting requirements, and the alleged act must fall within the applicable prior-acts period. Retroactive dates, continuity, known-circumstances exclusions and extended reporting provisions deserve careful review when changing insurers or closing a practice.

Promptly report demands, complaints and circumstances that may reasonably lead to a claim. The policy wording determines the notice standard.

Contracts can exceed the insurance

Client agreements may include warranties, broad indemnities, performance guarantees or liability caps that do not align with insurance. Have legal counsel review contracts and ask the broker about insurance requirements before signing. A certificate cannot expand the professional services or override an exclusion.

Some professions have regulator, association or client requirements for specific forms and limits. Confirm current obligations with the applicable authority rather than relying on a general website summary.

Information insurers commonly request

Prepare revenue by service and jurisdiction, qualifications, client and project concentration, sample contracts, quality-control practices, subcontractors, complaints, claims and known circumstances. Written scopes, change orders, peer review, version control and documented client acceptance can help reduce disputes. Architects and engineers can also review our practice-specific guide.

Contact Westoak before adding a material service, signing a large contract, acquiring a firm or changing a claims-made policy.