A building sitting half framed, with lumber stacked under a tarp and a trailer full of fixtures nobody's paid for yet, is not a building your regular commercial property policy was designed to think about. This common, but potentially costly situation is exactly what course of construction insurance, also called builder's risk insurance, is built to address. It covers the structure being built or renovated, the materials and equipment on site, and sometimes equipment in transit or in temporary storage, against loss from things like fire, theft, vandalism, windstorm, and a defined amount of water damage, for the specific window between the first shovel and the day the project is finished or occupied.
The two names describe the same product, and which one your broker uses usually just reflects which insurer's paperwork you're looking at. What matters more than the label is understanding that this is a standalone policy sized to a project, not a rider tacked onto something you already own, and it runs on its own clock rather than the calendar year your other policies use.
What the policy actually pays for
The core of a course of construction policy is property damage to the work itself while it's incomplete. That includes the partially built structure, building materials and supplies staged or stored on site, and often equipment used in the build, subject to the specific perils named in the policy and the limits chosen. Water damage is typically covered but capped at a stated limit, and if the site carries real exposure to overland flood or sewer backup, that's usually an add-on you have to ask for and pay extra for rather than something bundled in by default.
What it doesn't do is cover you once the project wraps. Coverage is meant to end at completion or occupancy, so a renovation that drags on past its policy term, or a building that gets occupied before the punch list is finished, can leave you exposed in a gap nobody budgeted for. The policy also generally excludes damage from government action and mechanical breakdown, and it doesn't cover liability at all, meaning if a subcontractor's error injures someone or damages a neighbouring property, that's a separate general liability or wrap-up liability question, not something this policy touches.
Who's expected to carry it
Either the property owner or the general contractor typically buys the policy, and which one depends entirely on what the construction contract says, so the answer to "who needs this" is really "whoever the contract assigns it to," which is worth checking before you assume it's someone else's problem. Everyone with a real financial stake in the project, including the owner, the general contractor, major subcontractors, the lender, and sometimes the architect or developer, should be named as an insured or otherwise have their interest reflected on the policy, because a policy that only names the contractor does the owner no good if the contractor's the one who walks away from the loss.
Lenders are usually the ones who turn "should have" into "must have." Course of construction insurance isn't mandated by law in most cases, and specifically isn't a legal requirement in Ontario, but banks and other lenders financing a build routinely make it a condition of releasing funds, and a project owner who skips it can find the lender simply won't advance the next draw. Municipal permit conditions, condominium corporation bylaws, or the terms of a specific construction contract can also effectively require it even where no statute does, so "is this mandatory" often comes down to reading your loan agreement and your contract rather than a government rulebook.
How long the coverage actually lasts
Policies are written to run for the length of the project and are meant to end when the work is done or the space is occupied, not on a fixed annual renewal date the way a homeowner or commercial property policy would. That project-length structure is useful because it matches the coverage to the actual risk window, but it also means timelines matter in a way they don't with ordinary insurance. A project that runs long because of delays, weather, or a supply holdup needs its policy extended before it lapses, and nobody wants to discover a gap in coverage only after a loss happens during the overrun.
What to check before you assume you're covered
Whether you're the owner, the contractor, or a subcontractor with materials staked on the outcome, a few questions are worth running down before relying on someone else's policy or assuming your existing insurance stretches to cover a build:
- Who is contractually obligated to buy the course of construction policy, and does the certificate actually name the parties who need to be named, including subcontractors with material on site.
- What perils are included versus excluded, particularly whether flood, sewer backup, or earthquake needs to be added given the site's actual exposure.
- What the stated limit for water damage is, since it's commonly capped well below the limit for fire or theft.
- When the policy's term ends relative to the realistic completion date, with some buffer built in for the delays construction projects tend to produce.
- Whether liability exposure, which this policy doesn't cover, is properly addressed through a separate general liability or wrap-up liability policy.
None of this substitutes for reading the actual policy wording or the construction contract in front of you, since coverage terms, exclusions, and who's obligated to buy what all vary by insurer, by province, and by the specific deal. But knowing the shape of the product, and knowing that "nobody told me I needed it" isn't a defence a lender or a project partner tends to find persuasive, puts you in a much better position to ask the right question before the framing goes up rather than after something falls down.