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Market Watch

Analysis shows nearly 20,000 new homes built in risky areas

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Market Watch
Monday, August 19, 2019

As America’s coastal communities continue to build homes in flood-risk zones, a new analysis by Climate Central and Zillow shows that nearly 20,000 homes built in the past decade are at significant risk of chronic coastal flooding by 2050.

And if greenhouse gas emissions go unchecked, more than 800,000 existing homes worth $451 billion will be at risk in a 10-year flood by 2050, the analysis shows. Those numbers jump to 3.4 million existing homes worth $1.75 trillion by 2100.

“The nationwide analysis that pairs Zillow’s housing data with Climate Central’s sea-level rise expertise identifies the number of new homes — and homes overall — in low-lying coastal areas, projecting how many will become exposed to chronic ocean flooding over the coming decades, depending on the choices the world makes around greenhouse-gas pollution today,” the analysis states. “It expands on analysis done last year that showed some 386,000 current U.S. homes are likely to be at risk of regular annual flooding by 2050 because of sea-level rise from climate change, and that new homes are being built at striking rates in areas that face high risks of future flooding.”

The findings are available in an interactive map displaying the flood-risk zones, a sea-level tool detailing the number and value of homes at risk by location, a research report on the threat to new housing and a brief on the dangers to housing stock overall.

As sea levels rise, Climate Central and Zillow point out, the intermittent floods that coastal communities now experience once a decade on average are projected to reach farther inland than they do today. Those floods can damage and devalue homes, degrade infrastructure, wash out beaches, and interrupt transportation systems and other aspects of daily life. They also put homeowners, renters and investors in danger of steep personal and financial losses.

“This research suggests that the impact of climate change on the lives and pocketbooks of homeowners is closer than you think. For home buyers over the next few years, the impact of climate change will be felt within the span of their 30-year mortgage,” Skylar Olsen, Zillow’s director of economic research and outreach, said in the analysis report. “Without intervention, hundreds of thousands of coastal homes will experience regular flooding and the damage will cost billions. Given that a home is most people's largest and longest-living asset, it takes only one major flood to wipe out a chunk of that long-growing equity. Rebuilding is expensive, so it’s doubly tragic that we continue to build brand-new units in areas likely to flood.”

Florida would have the most homes in the zone at risk from sea-level rise and 10-year floods by 2100 (1.58 million), followed by New Jersey (282,354), Virginia (167,090), Louisiana (157,050) and California (143,217) — assuming levees and other infrastructure defenses hold, and emissions continue unchecked.

What’s more, 24 cities including New York; Tampa, Fla.; and Virginia Beach, Va.; have built at least 100 homes in that risk zone since 2009.

“Thanks to Zillow’s data, Climate Central’s sea level rise analysis provides an economic view of coastal flood risks that homeowners may face – not generations into the future, but within the time frame of a typical home loan,” Climate Central Chief Scientist and CEO Dr. Benjamin Strauss said. “In many states, building on land projected by 2050 to face chronic flood risks has outpaced development in safer places. Failure to control climate pollution will lead to faster-rising seas and bigger coastal risk zones, but building a cleaner-running economy can still reduce these consequences.”

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