Economist Matthew Kahn has published a working sketch of a field-experiment research design intended to measure the financial returns of certified disaster-resilient real estate. The post, on his Substack, proposes a randomized methodology for quantifying how much value accrues to homeowners who invest in research-based mitigation — and under what conditions that value compounds. (Matthew E. Kahn, Substack)

The piece is short, but its framing is unusually relevant for California's luxury market, where homeowners are already paying for resilient construction without a rigorous evidence base for what the upgrade is worth. Kahn's design isolates five mechanisms — including direct insurer discounts conditional on certification, increasing-returns effects when neighbors also certify, and the possibility that certifying bodies other than IBHS may enter the market. (Kahn)

Five channels of return

Kahn's sketch distinguishes between household-level returns (lower premiums, lower expected losses), conditional incentives (insurers offering discounts only if mitigation is verified), and what he calls local increasing returns: the idea that a certified home is worth more if its neighbors are also certified, because aggregate wildfire risk on the block declines. He also flags that IBHS does not have a monopoly on certification, leaving room for parallel standards to emerge. (Kahn)

The IBHS Wildfire Prepared Home program — launched in California in 2022 and operating in two tiers, Home and Home Plus — is the most prominent existing certification and is currently recognized under California's Safer from Wildfires framework as an aggregate qualifying standard for admitted carrier discounts. (IBHS; CDI)

Why a field experiment is hard — and why it matters

The methodological problem Kahn is trying to solve is selection. Homeowners who voluntarily certify their property tend to be wealthier, more risk-aware, and better-located than the average wildfire-exposed household. Comparing their outcomes to those of uncertified neighbors conflates the effect of the certification with the effect of being the kind of person who certifies. A randomized field design — where mitigation is offered as a treatment to one group and not another — is the cleanest way to isolate the causal return on resilient investment. (Kahn)

California's regulatory architecture is, in effect, running a non-randomized version of this experiment already. Safer from Wildfires recognizes mitigation across three layers — structure, parcel, and community — and requires admitted carriers to differentiate pricing accordingly. The IBHS Wildfire Prepared Home designation has been adopted as the aggregate qualifying standard at the parcel level. (CDI)

What the LA luxury market should take from this

For ultra-prime buyers in Malibu, Beverly Hills, Bel Air, and the Westside, Kahn's framing reorders the resilience conversation in three ways. First, the insurance discount is necessary but not sufficient — the larger expected return likely comes from reduced loss probability and from asset value retention in a market where insurability increasingly drives liquidity. Second, the increasing-returns effect implies that certified homes in clusters of certified homes will outperform isolated certified homes; this favors developments and neighborhoods that adopt resilience at scale rather than one-off upgrades. Third, the open question of certifying bodies suggests that buyers should be specifying assemblies that satisfy the most credible standard available, rather than chasing whichever certification the carrier currently honors.

The practical implication is that a fire-resilient home is best understood as an investment whose returns are partly endogenous to the surrounding fabric — a point that California's regulatory framework already encodes, but that the market has not yet fully priced.

Looking ahead

Whether or not Kahn's specific experimental design is funded, the questions it raises are now squarely on the table for California's admitted carriers, regulators, and luxury developers. The next year of policy filings and rebuild cycles will determine whether the financial gap between certified and uncertified luxury inventory becomes wide enough to be visible at the closing table — or whether it remains buried inside the premium line.

Our Perspective
We read this proposal less as a research idea and more as a quiet reframing of the buyer's question. For years, the resilience conversation has focused on a single household's premium. The field-experiment sketch points to something more interesting for our work: the value of a certified home rises when the parcel, the neighbor, and the community are also certified. That is exactly how we approach the system — ICF reinforced concrete envelope, Class A roof, ember-resistant openings, defensible Zone 0 — designed so the home is legible to underwriters not as a list of features, but as a single qualifying assembly. The asset is the certified system, not the upgrade.