The Coinsurance Penalty: Why a Covered Commercial Claim Can Come Up Short

You had a covered loss, the adjuster agreed on the damage, and the check still came in well below the repair cost. One common reason is a line on the claim worksheet called coinsurance. It catches Hawaiʻi owners, boards and managers every year, because construction costs on the islands have climbed faster than many insured values.

What coinsurance means

Coinsurance is a condition in most commercial property policies. In exchange for a lower rate, you agree to insure the property for at least a set percentage of its value, shown on your declarations page. If, at the time of the loss, your limit is less than that percentage of the property’s value, you share in the loss, and the insurer pays less than the covered damage.

The formula

A worked example

This example uses the same numbers as a widely used standard commercial form:

The same math at Hawaiʻi building scale

Why Hawaiʻi properties get caught

• Values go stale. Shipped materials, limited labor and island logistics push rebuild costs up. A limit set at purchase, or several renewals ago, can fall behind without anyone noticing.
• Replacement cost raises the bar. If your policy settles at replacement cost, the coinsurance test is usually measured against replacement cost too, which is higher than actual cash value.
• Improvements go unreported. A new roof, solar, a tenant build-out or an addition raises value. If the insurer never hears about it, the limit stays put.
• Blanket limits rely on old schedules. A blanket limit across several buildings is only as good as the statement of values behind it.
• Premium pressure. When premiums jump, it is tempting to trim limits at renewal. That can trade a premium saving for a penalty on the next claim.

How to avoid a penalty before a loss

• Get a professional replacement cost valuation on a regular schedule and after any major improvement.
• Ask about agreed value. This optional coverage suspends coinsurance until the agreed value expiration date shown, or the end of the policy if that comes first. It requires a statement of values, and it has to be renewed.
• Consider inflation guard, which raises limits automatically during the policy term.
• Report improvements to your agent in writing, and keep a copy.
• Check both limits. Coinsurance applies separately to building and to business personal property, and to each building unless the limit is blanket.
• Keep the statement of values with your records, so you know exactly what the insurer was told.

If the insurer applies coinsurance after a loss

A coinsurance reduction is only as good as the valuation behind it. Before accepting one:

1. Ask in writing for the valuation report and how it was prepared: square footage, construction type, quality and the cost data used.
2. Check the square footage and construction details against your plans, appraisals and records.
3. Make sure property the policy does not cover is left out of the value. Widely used forms do not cover land, foundations below the ground, excavation, underground pipes and drains, or paved surfaces.
4. Confirm whether agreed value was in force, and if you have a blanket limit, that coinsurance was applied to the right total.
5. Confirm the value is as of the date of loss, on the same basis as your valuation (replacement cost or actual cash value).
6. Get your own valuation if the numbers look high.

If you and the insurer still disagree on the amount, your policy’s appraisal clause may apply. If the first payment came in low for other reasons too, see How to Challenge an Underpaid Claim.

Common Questions