Chapter 19 — Key Takeaways

A one-page field card for commercial property underwriting. Every number here is illustrative.

The core claims

• See three exposures, not one. A property submission shows a building; the real risk is the building, the contents, and — the one that decides survival — the business income. The application describes the first; the underwriter must derive the third.
• The building is the smallest part of the loss. What ruins a company is not the cost of the steel and the machines; it is the income lost across the months it cannot operate.
• Valuation is a choice, and under-valuation is the classic, expensive mistake. Pick deliberately among replacement cost, ACV, agreed value, and functional replacement cost — and distrust a value that hasn't moved while construction costs have risen.
• The period of indemnity is set by the longest-lead element of the recovery, not the building rebuild. A specialized, long-replacement machine — not the structure — usually drives the clock.
• Coinsurance enforces honest valuation and bites on partial losses. Under-insure, and the policy pays only the fraction of the loss equal to the fraction of required value you carried — even when the limit is nowhere near exhausted.
• Agreed value removes the coinsurance penalty in exchange for a verified value. It is a solution and a responsibility: the number now sits on you.
• Grade through COPE; classify HPR vs. non-HPR honestly. Most good, profitable business — and Harbor Steel — is non-HPR. Don't let a broker sell you an HPR rate on an ordinary risk.
• Know the gaps the property form excludes: internal equipment breakdown and property that moves (inland marine).
• Big risks are spread; the SOV measures them. Shared programs split a layer horizontally; layered programs stack vertically. A stale SOV is a mispriced account before any rate is applied.
• Property is first-party, so it concentrates catastrophe. One storm hits many of your own insureds at once — the failure of independence (Chapter 1) that Parts V handle.

The key formulas / rules of thumb

Coinsurance payment  =  Loss × ( Limit carried / Limit required )  −  deductible
   where Limit required = coinsurance % × full insurable value

Period of indemnity  ≈  the LONGEST critical-path element of the recovery
                        (often long-lead equipment, NOT the building rebuild)

Business income limit:  DERIVE from gross earnings × period of indemnity.
                        It has NO fixed ratio to the building value.

Valuation alarm:  a value unchanged for years + rising construction costs = distrust on sight.

The key terms

Business income (BI) · period of indemnity · agreed value · highly protected risk (HPR) · statement of values (SOV) · equipment breakdown · layered/shared program

What you could defend to your manager

"I wrote Harbor Steel's \$20M building on an agreed-value basis against a verified replacement cost, carved the end-of-life roof onto an ACV endorsement until its warranted 12-month replacement, set the business income at \$10M over a 12-month period of indemnity justified by the long-lead fabrication line, added equipment breakdown for the internal failures the property form excludes, and classified the account non-HPR and priced it as such. The valuation is real and the income exposure is calculated, so the rate is adequate. The one thing I have not settled is the catastrophe accumulation on the \$20M coastal line — that goes to reinsurance and cat modeling in Part V."