Coinsurance is the clause that punishes you for insuring your restaurant buildout on the cheap, and it does its worst damage on the partial losses that actually happen. If you insure your property below the percentage of value your policy requires, the carrier can reduce your claim payment in proportion. You do not have to burn down to get hurt by it. Here is how it works and how to switch it off.
What the clause requires
A coinsurance clause asks you to insure your property to a stated percentage of its value, commonly 80, 90, or 100 percent. In exchange for that promise, the carrier prices the coverage on the assumption that you carried your share. If a loss occurs and you insured for less than the required amount, the coinsurance provision reduces your recovery. The logic is that an owner who insures to half of value and pays for half the exposure should not collect as if they insured to full value. Fair or not, it is in the policy, and it applies quietly until a claim triggers it.
The formula in plain language
The math is simpler than it sounds. Take the amount of insurance you actually carried, divide it by the amount you should have carried under the coinsurance requirement, and multiply that fraction by the loss. Subtract your deductible, and that is your recovery. If you carried three-quarters of what you should have, you recover roughly three-quarters of a covered partial loss. The clause does not care that you had a real, covered fire. It cares about the ratio between what you insured and what you should have. That ratio becomes the haircut on your check.
A worked example
Round numbers, illustrative only, to show the formula and not as a price or a quote. Say your tenant buildout would cost 500,000 to replace. Your policy carries an 80 percent coinsurance clause, so you should insure it for at least 400,000. Instead you insured it for 300,000. A partial fire causes a 100,000 loss. The carrier runs the formula: 300,000 divided by 400,000 equals 0.75. Your 100,000 loss is paid at 75 percent, so 75,000 before the deductible, and you absorb the remaining 25,000 plus your deductible. Nothing about the fire was denied. The underinsurance alone cost you a quarter of the claim.
Why tenant improvements are the trap
The most undervalued number on a restaurant policy is the buildout. Tenant improvements and betterments, the kitchen, hood, finishes, plumbing, and electrical you installed in a leased space, are expensive to replace and easy to insure for too little. Owners tend to insure what they recall spending, sometimes years ago, rather than what it would cost to rebuild today. Add rising construction and equipment costs, and a figure that was reasonable at signing drifts below replacement value on its own. The clause then does the rest. This is why a buildout, a renovation, or simple time is a reason to recheck the insured value.
Agreed value as the fix
The clean fix is to insure to value and keep the number current. The stronger fix, where available, is agreed value. Agreed value is an option that suspends the coinsurance clause when you and the carrier agree on the insured value up front, usually backed by a statement of values. When it applies, the proportional penalty does not, so a partial loss is not reduced by a valuation argument at claim time. You still need the value to be realistic, but you remove the trap. For a restaurant with a significant buildout, insuring to replacement value and asking about agreed value are two of the highest-value decisions on the policy.
Questions to ask your advisor
- What coinsurance percentage does my property policy require?
- How were my tenant improvements valued, and is that number current?
- Does my insured value reflect today’s replacement cost, not what I spent years ago?
- Is agreed value available on my policy, and would it suit my situation?
- If I had a partial loss tomorrow, would a coinsurance penalty apply?
- Should I update my statement of values after recent construction or price increases?
The penalty is avoidable, but only before the loss. Once the claim is filed, the ratio is already set.
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