Climate change and home value.
A clear read on what the research actually says about how climate exposure moves US home prices — and how to protect value when you're buying.
The research is unambiguous: risk is being priced in
Academic and industry studies converge on the same picture. Bernstein, Gustafson, and Lewis found a roughly 7% price discount on coastal homes most exposed to sea-level rise, versus matched inland comparables. First Street's analyses show flood-zone properties trading at high single-digit discounts, with the discount widening in markets where insurance has gotten hard. Redfin and Zillow have published similar numbers for wildfire exposure in Western metros.
The mechanism is straightforward — buyers are getting better information, lenders are increasingly checking risk, and insurance premiums show up directly in what a borrower can afford.
How climate exposure actually depresses price
- Insurance premiums eat affordability. A $400/month wildfire-rated policy is roughly $80,000 of borrowing power gone at current rates. That comes off the offer.
- Mortgage cost. Lenders price flood and wildfire exposure into rate sheets and reserve requirements, especially on non-conforming loans.
- Time on market. Risky listings sit longer, leading to price cuts.
- Capital improvements required. Buyers underwrite a roof replacement, defensible-space clearing, or flood retrofits into the offer.
- Resale uncertainty. Even buyers who plan to live in the home a long time know their eventual buyer will face the same questions, larger.
The signal isn't uniform — yet
Some high-risk markets are still appreciating. Supply scarcity, amenity premiums, and remote-work demand can hide the climate discount in the average. The discount usually shows up clearly only in transaction-level regressions that control for size, age, and neighborhood — work most homeowners never see.
The places where the discount is visible to the naked eye are the ones with active insurance crises (Pacific Palisades after fires, parts of Cape Coral after Ian) or persistent flooding (Norfolk, parts of Charleston). The wider US looks calm in price-per-foot until you look at the underlying insurability data.
How to protect value when buying
- Pull the address through an address-level climate model before making an offer. Run the demo.
- Get a written insurance quote — not a verbal estimate — before signing.
- Ask the seller for last three years of premiums and any non-renewal notices.
- Budget for hardening (Class-A roof, defensible space, shutters, water shutoffs) and price it into your offer.
- Check the 20-year outlook, not just today's score. A house that is fine today and a Category-2 surge zone in 2040 has a different resale story than a house that is safe through 2050.
Why the 20-year window matters
A home is the longest-duration asset most people own. The buyer you sell to in 2040 will be using a model trained on 2030s losses. Address-level climate intelligence — what ArchipelAI builds — is the same data the carriers and lenders will use to price your future buyer's mortgage. Knowing what it says about your address is no longer optional.
Common questions
- Does climate risk really lower home values?
- Yes, measurably. Peer-reviewed work from Bernstein, Gustafson, and Lewis (Journal of Financial Economics, 2019) found coastal homes exposed to sea-level rise trade at a 7% discount versus equivalent inland homes. More recent work from First Street and Redfin shows similar discounts for wildfire and flood exposure in the West and Southeast.
- How much does flood risk affect price?
- Studies put the flood-zone discount in the 4–12% range, larger in markets where insurance is hard to find. The discount widens after a major flood event and tends to persist for years.
- Why are some risky markets still appreciating?
- Supply constraints, amenity value, and buyer optimism can mask climate discounts. The signal is usually clearer in transaction-level data once you control for square footage, lot size, and neighborhood.
- Should I avoid buying in a high-risk area?
- Not necessarily — but price the risk in. Get a written insurance quote, model the 20-year insurability outlook, and confirm the home is hardened against the dominant peril.
- How do I check my home's climate exposure?
- ArchipelAI gives an address-level score across flood, wildfire, wind, heat, and grid outages, plus a 20-year forward projection. Try the homeowner demo on the address.
Run this on your address.
See your address-level flood, fire, wind, heat, and outage scores — plus a 20-year outlook. No login for the demo.