
Why Timing Matters: Claims-Made vs. Occurrence Engineering Insurance
You’ve finished the project, stamped the drawings, and moved on to the next big build. But in the engineering world, your liability doesn't end when the site trailers leave.
If a structural issue or design flaw is discovered five years from now, will your current insurance policy actually respond? The answer depends on two technical words: Claims-Made.
Understanding the difference between Claims-Made and Occurrence coverage is the most critical part of an engineer’s risk management strategy. For Ontario firms, getting this wrong doesn’t just mean a denied claim, it could mean personal financial exposure long after you’ve retired.
The Core Difference: Brain vs. Boots
In the insurance industry, we often distinguish between your "Brain" (professional design work) and your "Boots" (physical presence on-site).
Professional Liability (E&O): Claims-Made
Most Professional Liability (E&O) policies are Claims-Made. This means the policy must be active at two specific times:
- When the alleged error or omission occurred.
- When the claim is actually filed against you.
If you let your E&O policy lapse, even if you were insured when you did the work, you may have no coverage when the claim finally hits your desk.
General Liability (CGL): Occurrence
Your Commercial General Liability (CGL) is typically Occurrence-based. This covers physical "incidents" (like a slip-and-fall on-site) that happen during the policy period, regardless of when the claim is reported later.
Why This Matters for Your Career Transitions
Because engineering E&O is claims-made, you must be proactive during major life changes:
- Switching Jobs: If you leave a firm, you need to ensure the firm maintains coverage for your "Prior Acts."
- Retirement: You shouldn't just cancel your policy on your last day. You typically need "Tail Coverage" (Extended Reporting Period) to protect you from claims related to work you did years ago.
- Starting a New Venture: When launching a new firm, your "Retroactive Date" is vital. It dictates how far back your new policy will look to cover past professional acts.
The Roughley Advantage: Engineering Expertise
As an engineer myself, I know that your reputation is built over decades, but a single "timing gap" in an insurance contract can put that all at risk. We don't just shop for rates; we audit your retroactive dates and tail coverage to ensure your legacy is protected.
What should you do next?
- Check the "Retroactive Date" on your current E&O policy.
- Review your client contracts for "Extended Reporting" requirements.
- Talk to an Expert at Roughley to ensure your current coverage doesn't have a "timing gap."
Ready to Work with an Expert?
Get a Tailored Insurance Quote
Whether you're buying coverage for the first time, switching from another provider, or just want to make sure you're properly protected, we're here to help you get the right policy.
Frequently Asked Questions
Does my Secondary Professional Liability (SPLI) cover my firm?
No. The SPLI program provides individual protection, but it does not cover your business entity or its employees. You need a primary firm policy for that.
Related Articles

Engineering Contracts in Ontario: 6 Clauses That Can Void Your E&O
Your client's contract can quietly create liability your E&O policy will never pay. These are the six clauses Ontario engineers should flag before signing, and the protections worth negotiating in.

The Ultimate Guide to Engineering Insurance in Ontario
PEO sets baseline insurance requirements for engineering firms, but most projects demand far more. This guide covers how engineering E&O works, how coverage differs by discipline, and the gaps that catch firms off guard.

E&O Insurance in Ontario: Coverage, Who Needs It, Claims-Made
Whether your contracts require Errors & Omissions (E&O) or professional liability insurance, both refer to the same commercial coverage in Ontario. As a RIBO-licensed, independent brokerage established in 1945, Roughley Insurance Brokers specializes in E&O placement for consultants, engineers, financial advisors, IT professionals, and real estate brokers throughout Durham Region and Ontario. With in-house Lloyd’s of London underwriting for complex risks, our team ensures your expertise, contracts, and advice are supported by robust policy terms.