The commercial general liability policy is the most-owned, least-read document in Canadian business. Owners know it exists, know its limit, and know the certificate it generates — and the rest stays folded until a claim unfolds it. This tour is the alternative: twenty minutes with the structure of your CGL, so the wording never surprises you at the worst possible time.
Follow along with your actual policy if you have it handy. The architecture below is standard across Canadian wordings, even where the details vary.
The three coverages, A through C
Coverage A is the engine: bodily injury and property damage to third parties, caused by an occurrence, during the policy period. Every big CGL claim — the fall, the fire that spreads, the product that injures — runs through A. Coverage B is personal and advertising injury: a compact but potent grant covering claims like defamation, false arrest, and certain advertising missteps (media businesses need more, but B handles the incidental exposure most businesses carry). Coverage C is medical payments: small, no-fault amounts for minor third-party injuries — the goodwill coverage that resolves the twisted ankle before it becomes the lawsuit.
Two structural ideas power all three. 'Occurrence' — generally an accident, including continuous exposure to the same conditions — is the trigger; intended harm isn't an accident, which is why the policy defends the careless but not the deliberate. And 'third party' is the constant: the CGL protects you against others' claims, never your own losses. Your damaged equipment is a property claim; your injured customer is a CGL claim.
Limits: per occurrence, aggregate, and the ones inside
The declarations page shows the numbers that matter: the per-occurrence limit (the most paid for any single occurrence) and the aggregate (the most paid across the policy year — often twice the occurrence limit, and the number that matters if the year turns bad). Products and completed operations frequently carry their own aggregate; check it, because for trades and manufacturers that's where the long-tail claims land.
Then the quiet limit: defence costs. In most Canadian CGL wordings, defence is paid in addition to limits — the insurer appoints and pays counsel without eroding your coverage — which is arguably the policy's most valuable single feature. The duty to defend triggers on allegations, not proof: even a meritless claim gets defended, which is precisely the point.
The exclusions that actually bite
Skip the exotic exclusions and know the working ones. Expected-or-intended injury (see 'accident', above). The 'your work' family: the CGL covers damage your work causes to other things, not the cost of redoing the work itself — defective workmanship is a business cost, its consequences are a claim. Care, custody, and control: property you're holding or working on directly often needs its own coverage (bailee, garagekeepers, tools floaters exist for this). Pollution: near-absolute, and why trades with any environmental touch buy the extension. Auto and professional services: excluded because other policies own them — the gap analysis every service business should run once.
The pattern across all of them: exclusions mostly mark territory belonging to other coverages. The CGL isn't refusing the risk; it's telling you which policy to buy.
Endorsements: where your policy becomes yours
The back pages customize everything. Additional insured endorsements extend your coverage to landlords, GCs, and clients for claims arising from your work — the machinery behind every certificate request, and worth reading once so you know what you're actually granting. Waivers of subrogation, contractual liability wording, declared-operations classifications (keep them current — undeclared operations are the classic gap), and the schedule of locations all live here.
When a contract demands specific wording, this is where compliance happens or doesn't. A certificate can only reflect what the endorsements actually say — the reason we ask for the contract language, not a summary of it.
Reading your own policy: a guided tour in one sitting
The CGL wording is readable in ninety minutes with a map, and the map is this: start with the declarations (who's insured, what limits, what deductibles, what period), then the insuring agreements (what the insurer promises — Coverage A for bodily injury and property damage, Coverage B for personal and advertising injury, medical payments where included), then the exclusions (where the promise stops), then the definitions (where the argument actually lives — 'occurrence,' 'insured,' 'your product,' 'property damage' are defined terms doing enormous work), and finally the conditions (your obligations: notice, cooperation, no voluntary payments).
Read with a highlighter and two questions: 'does this describe my business accurately?' and 'which of my real-world worries lands where?' The customer slip lands in Coverage A; the competitor's defamation complaint in Coverage B; the faulty-workmanship redo in the your-work exclusion (that's what completed-operations and other coverage conversations are for); the employee injury outside entirely, in WSIB's territory.
Flag anything that reads ambiguously against your operations and ask your broker in writing — the answer becomes part of your file, and file beats memory when a claim tests the question years later.
The endorsement layer: where standard wordings get customized
No CGL is bought bare; the endorsement schedule is where the standard form gets tailored, and it repays reading line by line. The additions that broaden: additional-insured endorsements naming your landlords and clients per contract, waiver-of-subrogation clauses contracts demand, blanket-contractual extensions, and the per-project or per-location aggregate endorsements that keep one bad project from exhausting the year's limit across all of them.
The restrictions that narrow: classification-limitation endorsements (coverage only for described operations — the reason undeclared services are uninsured services), specific-work exclusions (the roofing exclusion on a GC's policy, the hot-work restriction), abuse and molestation provisions where client work involves vulnerable people, and the increasingly standard cyber and communicable-disease carve-outs pushing those risks toward their dedicated policies.
The audit question each renewal: does the endorsement schedule still match the contracts you're signing and the work you're doing? Endorsements added for a 2023 contract linger harmlessly; operations added in 2025 without matching endorsements don't. Five minutes against the current contract stack, annually.
CGL in the wild: three claims through the machinery
Three composites showing the form at work. The slip: a customer falls on a showroom's wet entry tile, fracturing a wrist — Coverage A, cleanly; the insurer appoints defence counsel, the occupier's-liability question gets litigated on maintenance logs (kept, thankfully), and settlement lands inside the limit with defence costs paid outside it. The redo: a contractor's finished flooring fails across a whole condo unit — the your-work exclusion applies to replacing the floor itself, but the water damage the failure caused to the unit below is covered property damage; the claim splits precisely along the line the exclusion draws, which is the exclusion working as designed, not failing.
The words: a renovation firm's marketing compares a named competitor's work unflatteringly enough to draw a defamation suit — Coverage B responds, defence is appointed, and the matter resolves with a retraction and modest settlement. Three different insuring agreements, three different machineries, one policy — and in each file, the outcome quality tracked the insured's documentation and reporting speed more than any other variable the insured controlled.
The pattern to internalize: the CGL's job in every scenario was first defence — counsel, strategy, costs — and the claims process rewards the insured who reports fast and documents well. The policy is a litigation-funding instrument as much as a settlement-paying one.
The questions to ask your broker, in writing
Turn the reading into a file: after your ninety-minute tour, send your broker the short list in an email — which of my operations fall outside the classification wording; does my completed-operations coverage extend the way my contracts assume; which additional-insured obligations in my current contracts are actually endorsed; what would this policy not cover that businesses like mine most often claim for; and what would each identified gap cost to close.
Written answers do two jobs: they close real gaps now, and they document reliance later — if a claim tests a question you asked in writing, the answer is part of the record. It's the cheapest risk management in this entire article.
And re-run the exercise when the business changes shape — new services, new provinces, first employees, first big contract. The policy that fit at binding drifts from the business at the speed the business grows; the reading habit is how you notice before a claim does.
One structural footnote worth knowing: the standard CGL is occurrence-based — it responds to injury or damage that happens during the policy period, whenever the claim is eventually made — which is why continuity matters and why cancelling a policy after finishing a project does not end the exposure the project created. Some specialty liability forms work on a claims-made basis instead, responding only to claims made while coverage is in force; if your program mixes the two (a CGL beside a claims-made E&O, say), understand which is which before any lapse, because the gap rules are opposite. Your broker can map it in five minutes; the map matters most exactly when policies are changing.
The bottom line
Your CGL is three coverages, two limit structures, a handful of working exclusions that mostly point at other policies, and endorsements where the customization lives. Twenty minutes with that map, once, and every certificate request, contract clause, and claim letter for the rest of your business life makes sense on arrival.
Want the guided tour run on your actual policy — gaps, declared operations, endorsements against your current contracts? That's a review conversation we have every week, and it pairs perfectly with a marketed renewal.