From Oct. 12, 2020 to Jan. 3, 2021, Redfin ran an experiment on 17.5 million of its users across the US. As prospective homebuyers entered the site, Redfin assigned them randomly to either a group that was shown flood-risk information on each property or a group that was not.
The flood-risk scores came from First Street Foundation, a climate and technology nonprofit that works to make climate hazards more transparent to the public. In June 2020, First Street published the first public maps that revealed flood risk for every home and property in the contiguous US.
First Street scores properties on a scale of 1 to 10 based on the likelihood that they will flood in the next 30 years (which is assumed to be a typical mortgage term). A score of 1 means the property has "minimal" risk and a score between 9-10 is considered "extreme" risk.
From Oct. 12, 2020 to Jan. 3, 2021, Redfin ran an experiment on 17.5 million of its users across the US. As prospective homebuyers entered the site, Redfin assigned them randomly to either a group that was shown flood-risk information on each property or a group that was not.
The flood-risk scores came from First Street Foundation, a climate and technology nonprofit that works to make climate hazards more transparent to the public. In June 2020, First Street published the first public maps that revealed flood risk for every home and property in the contiguous US.
First Street scores properties on a scale of 1 to 10 based on the likelihood that they will flood in the next 30 years (which is assumed to be a typical mortgage term). A score of 1 means the property has "minimal" risk and a score between 9-10 is considered "extreme" risk.
So what happens once you start showing people flood-risk information? They, not surprisingly, start systematically looking for safer properties. After one week of users being exposed to this new information, prospective buyers who were previously looking at "extreme" homes started looking at homes that were about 7% safer.
After 9 weeks, these same "extreme" home buyers were looking at properties that were about 25% less risky. And for some buyers, in particular those working with a Redfin agent or partner, their flood-risk tolerance dropped by over 50%. (Embedded in this data might be a sales pitch for working with a knowledgeable Redfin agent or partner).
Also interesting is the fact that below "severe" flood risk (a score between 7-8), there was very little change in behavior. "Major" flood risk, it would seem, isn't all that concerning to most buyers. It needs to be "severe". Nevertheless, it is noteworthy that people will in fact make behavioral changes when presented with clear climate-risk data.
So what happens once you start showing people flood-risk information? They, not surprisingly, start systematically looking for safer properties. After one week of users being exposed to this new information, prospective buyers who were previously looking at "extreme" homes started looking at homes that were about 7% safer.
After 9 weeks, these same "extreme" home buyers were looking at properties that were about 25% less risky. And for some buyers, in particular those working with a Redfin agent or partner, their flood-risk tolerance dropped by over 50%. (Embedded in this data might be a sales pitch for working with a knowledgeable Redfin agent or partner).
Also interesting is the fact that below "severe" flood risk (a score between 7-8), there was very little change in behavior. "Major" flood risk, it would seem, isn't all that concerning to most buyers. It needs to be "severe". Nevertheless, it is noteworthy that people will in fact make behavioral changes when presented with clear climate-risk data.
The New York Times has an interesting article up talking about the possible impacts of climate change on coastal real estate in the United States. In it they make the argument that sales velocity is declining in flood-prone areas. Here are two snippets:
Over the past five years, home sales in flood-prone areas grew about 25 percent less quickly than in counties that do not typically flood, according to county-by-county data from Attom Data Solutions, the parent company of RealtyTrac. Many coastal residents are rethinking their investments and heading for safer ground.
In the past year, home sales have increased 2.6 percent nationally, but have dropped about 7.6 percent in high-risk flood zones in Miami-Dade County, according to housing data. Many coastal cities are taking steps toward mitigation, digging runoff tunnels, elevating roads and building detention ponds.
I would like to see more data supporting this argument, but I can’t say I’m surprised. Flood risk is certainly something I would think about – particularly in high-risk areas such as South Florida. Florida has 6 of the 10 most vulnerable urban centers in the US.
The other piece that caught my attention is this:
Flood risks are easily overlooked because past flood damage often goes unreported and, as in Virginia, the burden of discovering it falls to the buyer. LexisNexis, a news and legal research company, can supply sellers a report with the history of flood claims on the property, but buyers usually do not know to ask for it. FEMA collects information on federal insurance claims for homes nationally, but the agency has been reluctant to make it public for privacy reasons.
It is yet another example of how opaque the real estate industry is. A lot of the information – assuming it’s even available – is fragmented across a number of different sources. If you’re playing hot potato, this obviously works to your benefit. But I don’t believe it’s the best thing for the overall market.
The New York Times has an interesting article up talking about the possible impacts of climate change on coastal real estate in the United States. In it they make the argument that sales velocity is declining in flood-prone areas. Here are two snippets:
Over the past five years, home sales in flood-prone areas grew about 25 percent less quickly than in counties that do not typically flood, according to county-by-county data from Attom Data Solutions, the parent company of RealtyTrac. Many coastal residents are rethinking their investments and heading for safer ground.
In the past year, home sales have increased 2.6 percent nationally, but have dropped about 7.6 percent in high-risk flood zones in Miami-Dade County, according to housing data. Many coastal cities are taking steps toward mitigation, digging runoff tunnels, elevating roads and building detention ponds.
I would like to see more data supporting this argument, but I can’t say I’m surprised. Flood risk is certainly something I would think about – particularly in high-risk areas such as South Florida. Florida has 6 of the 10 most vulnerable urban centers in the US.
The other piece that caught my attention is this:
Flood risks are easily overlooked because past flood damage often goes unreported and, as in Virginia, the burden of discovering it falls to the buyer. LexisNexis, a news and legal research company, can supply sellers a report with the history of flood claims on the property, but buyers usually do not know to ask for it. FEMA collects information on federal insurance claims for homes nationally, but the agency has been reluctant to make it public for privacy reasons.
It is yet another example of how opaque the real estate industry is. A lot of the information – assuming it’s even available – is fragmented across a number of different sources. If you’re playing hot potato, this obviously works to your benefit. But I don’t believe it’s the best thing for the overall market.
