What it means
The alternative is a scheduled policy, where every building, machine or stock location has its own stated limit. Scheduled cover is precise, but it fails badly when the schedule is out of date, because the insurer pays only the limit listed against the item that burned.
Blanket cover removes that trap by pooling the limit. A business with three warehouses insured under one blanket amount can suffer a total loss at the largest site and still be paid in full, provided the blanket limit is high enough.
That flexibility is the main reason companies pay a modest premium loading for it. The catch is the coinsurance clause.
Blanket policies almost always require the insured to carry a limit equal to a set percentage of total insurable values, commonly 80% or 90%, tested at the time of loss rather than at renewal. Fall below that and the insurer reduces every claim payment in proportion, even a small one.
That makes valuation discipline the real work. Insurers expect a statement of values updated at least annually, and building cost inflation can push replacement values up faster than most finance teams expect.
A company that reports last year's figures on this year's buildings can find itself technically underinsured without having changed anything. Blanket cover also comes in forms other than property.
Blanket crime or fidelity bonds cover all employees rather than named individuals, and blanket floaters cover categories of moveable equipment wherever it happens to be. The common thread is one limit applied across a defined group instead of item-by-item cover.
In practice
Real-world examples.
Example
A restaurant group with fourteen sites insures buildings and contents under one blanket limit. When a kitchen fire causes $900,000 of damage at a site whose scheduled value would have been $600,000, the claim is settled in full without argument about the schedule.
Example
A manufacturer moves finished stock between two depots depending on order flow, so the split of value between them changes weekly. A blanket stock limit means the insurer never has to determine which depot held the value on the day of a loss.
Example
A property investor buys blanket cover across eleven small commercial units rather than scheduling each one. Renewal admin falls sharply, though the broker insists on a fresh valuation exercise each year to keep the coinsurance test satisfied.
Formula
Calculation
Two steps matter. First, Required insurance = total insurable values x coinsurance percentage; second, if the limit carried meets that requirement, losses are paid in full up to the blanket limit. Consider a distributor with three warehouses reported at $2,000,000, $3,000,000 and $5,000,000, giving total insurable values of $10,000,000. With a 90% coinsurance clause the required insurance is $10,000,000 x 0.90 = $9,000,000, and the company buys a blanket limit of exactly $9,000,000. A year later stock has shifted between sites, so actual values are $2,000,000, $4,000,000 and $4,000,000, still totalling $10,000,000, and the coinsurance test is still met. A fire destroys the middle warehouse with a rebuild and stock cost of $4,000,000, and the blanket policy pays the full $4,000,000 because it sits below the $9,000,000 limit. Under an old scheduled policy carrying $3,000,000 on that building, the payment would have been $3,000,000, leaving the company $4,000,000 - $3,000,000 = $1,000,000 out of pocket.Case study
Seen in the real world.
Ravenswood Logistics is a fictional cold-chain operator created for this illustrative example. It ran five depots on a scheduled property policy, with limits last reviewed four years earlier, when construction costs were considerably lower.
A roof collapse at its second-largest depot produced a rebuild estimate of $5,600,000 against a scheduled limit of $3,800,000. The insurer paid the limit, and Ravenswood funded the $1,800,000 difference from a facility it had earmarked for a new automated picking line.
Moving to blanket cover at the next renewal, with a 90% coinsurance clause and an independently prepared statement of values, cost about 6% more in premium. In this illustrative account the finance director described that loading as the cheapest insurance decision she had ever made.
Watch out
Common mistakes.
- Assuming blanket cover means unlimited cover. The blanket limit is still a hard ceiling; it is simply shared across locations instead of split between them.
- Ignoring the coinsurance clause and reporting stale values, which triggers a proportional reduction on every claim, however small.
- Confusing blanket cover with an umbrella or excess policy. Blanket cover shares one primary limit across items, while an umbrella sits above other policies entirely.
Questions
People also ask.
Does blanket cover cost more than scheduled cover?
Usually a little, because the insurer is exposed to the full limit at any single location, but the loading is often modest relative to the underinsurance risk it removes.
How often should values be updated?
At least annually, and sooner after an acquisition, a major stock build or a period of sharp construction cost inflation.
Can blanket cover apply to things other than buildings?
Yes, it is commonly used for stock, moveable equipment and employee dishonesty cover, where a single limit across a category is more practical than naming each item.
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