Loss Prevention and Risk Engineering: The Only Lever That Lowers the Cost Floor

**Loss prevention** — also called risk engineering — is the practice of an insurer actively reducing the chance or severity of claims rather than only pricing and paying them. It is the one lever that lowers the underlying cost of risk instead of redistributing it. Every other tool in insurance rearranges *who* pays and *when*. Pooling smooths timing, float earns on the interval, reinsurance moves exposure. Only prevention reduces the physical expected loss — which makes it the only route to genuinely cheaper insurance rather than a differently-shaped bill. See Risk Pooling Reduces Uncertainty, Not Cost. ## How it works commercially The model is best developed in commercial property. **FM Global** is the standard example: it employs engineers who inspect insured facilities, prescribe improvements, and price the results, returning surplus to members when losses come in low. The insurer's engineering capability is the product. Reinsurers and public insurers do the same at larger scale — funding flood defences, wildfire fuel management and building-code work, because a euro spent on prevention can avert several in claims. ## The Swiss case Switzerland's cantonal building insurance is the strongest public example. In 19 of 26 cantons, building insurance is a mandatory public monopoly covering fire and natural hazards, and a substantial share of premium income — commonly cited between 15% and 30% depending on canton and source — is directed into prevention rather than paid out or retained. The results are notable: those cantonal schemes are typically **cheaper** than private cover in the comparable cantons, with the annual premium for a house of around CHF 800,000 replacement value commonly in the range of a few hundred francs. Mandatory participation removes adverse selection, and the prevention spending lowers the loss cost itself. See Public Insurance: Where Governments Already Nationalised Risk. ## Why it isn't used everywhere Prevention is bounded by economics and by physics. **On homes the arithmetic is marginal.** An annual professional inspection costs a meaningful fraction of a typical home premium, so on an ordinary house the prevention programme can cost about as much as it saves. It pencils out on high-value properties and commercial facilities where a single averted loss is enormous. **Many perils are not preventable by inspection.** A storm-felled tree, theft, liability, or a kitchen fire are not caught by checking pipes and wiring. Prevention addresses the failure modes that give warning — not the ones that don't. So prevention is real, is the only true cost-reducing lever, and is nonetheless bounded. It is the difference between insurance being 10–30% cheaper and insurance being free.