The framing is up, the roof is half done, and a windstorm tears through overnight. Your standard commercial property policy doesn't cover the structure because, technically, there isn't a structure yet, just materials assembled with intent. Course of construction insurance, sometimes called builder's risk insurance, exists precisely for this gap: it covers physical loss or damage to a building project while that project is still underway, from the moment materials arrive on site until substantial completion or occupancy, whichever comes first.
The coverage attaches to the project itself rather than to whoever happens to own the tools or the land. It typically protects the building materials, fixtures, and equipment that will become permanent parts of the structure, along with temporary structures like scaffolding and formwork. Some policies extend to soft costs, meaning the extra expenses you'd face if a covered loss delayed the project and you had to keep paying interest on a construction loan, or re-engage architects and engineers for revised drawings. The policy doesn't care whether the loss comes from fire, theft, vandalism, or certain weather events, though the specific perils covered depend entirely on what you negotiate and pay for. Flood and earthquake coverage, for instance, usually require separate endorsements, and some policies are written on a named perils basis rather than all risk, which matters more than you'd think when you're standing in the rain looking at what used to be a foundation.
Who buys this coverage varies by project and by who has the most to lose if something goes wrong. On a large commercial build, the general contractor often arranges the policy and names the property owner, subcontractors, and sometimes the lender as additional insureds. On a smaller renovation, the property owner might purchase the coverage directly, particularly if the work is substantial enough that a standard property policy's renovation exclusion kicks in. The point is that someone needs to buy it, and the contract documents should make crystal clear who that someone is, because insurers aren't in the business of covering buildings twice or guessing whose policy applies when both parties assumed the other one handled it.
The limitations matter as much as the coverage. Course of construction policies typically exclude defective workmanship and faulty design, covering the resulting damage to other parts of the project but not the cost of redoing the defective work itself. They exclude normal wear and tear, mechanical breakdown, and losses that stem from the contractor's own errors in construction methods. They also tend to have reporting requirements, meaning you need to notify the insurer when the project value changes or when you hit certain milestones, and failing to report can leave you underinsured at exactly the wrong moment. The policy expires when construction ends, so the transition to a permanent property policy needs to happen without a gap, which sounds obvious but gets missed with surprising regularity when everyone assumes someone else is handling it.
For a business owner undertaking a renovation or a new build, understanding what course of construction insurance actually does is less about becoming an expert in coverage forms and more about knowing the right questions to ask before the first shovel goes in. The answers affect who bears the risk, how much coverage is enough, and what happens if a loss occurs while everyone is still arguing about whose policy responds. This is exactly the kind of thing that sits quietly in a file until it suddenly matters enormously, and having something in your corner that watches for these details before they become disputes is what keeps a building project from becoming an expensive education. Share your own experience with construction coverage in the comments below.