Fewer than 28 percent of Miami-Dade County homes have been constructed according to codes passed in the aftermath of Hurricane Andrew according to the 2015 American Community Survey, per Quartz Media.

The requirements, aimed at ensuring homes can withstand the wind and flood risks associated with a Category 3 hurricane, were passed in 1994, along with broader statewide legislation passed in 2001. Hurricane Andrew destroyed more than 125,000 homes when it struck the Miami area in 1992. Since the regulations only apply to homes built since 1994, many older homes may not have been adequately equipped to handle the impacts of Hurricane Irma.

The study showed that Collier County, on Florida’s West Coast, has seen the most new home construction of Florida’s southern counties since 1990. As such, 50 percent of homes there meet the new requirements. However, in the East Coast counties of Monroe and Broward, only 26 percent of homes have been constructed since 2000. Across all counties in South Florida, approximately 50 to 75 percent of homes do not meet modern hurricane codes. However, the study did not take into effect homes built prior to 1992 that already exceed modern or homes that have been retrofitted in recent years for enhanced hurricane resistance.

Nationally, 16 percent of homes have been built since 2000, which means Florida has a higher percentage of new homes than the national average, but Florida homes are more susceptible to wind and flood damage than other areas of the country, according to financial and housing analysts CoreLogic. In fact, a 2017 storm surge analysis found that just under 2.8 million homes are at risk of damage in Florida. Nationally, six of 10 of the most at-risk cities for storm surge damage are in Florida.