The BUILT Act amends federal research law to fund new initiatives focused on making America's infrastructure more resilient to extreme weather and climate change. The bill directs the National Science Foundation Director to support research and testing on how extreme weather affects underground infrastructure and soil conditions, as well as to develop engineering standards and building codes that can withstand multiple hazards simultaneously. The legislation requires a workshop within two years to bring together experts, government agencies, and industry groups to create a framework for designing buildings and infrastructure that can handle multiple disaster risks, with a report to Congress due one year after the workshop concludes. The bill does not specify funding amounts, instead making appropriations available as Congress deems necessary. This legislation primarily affects infrastructure planners, building code developers, engineers, and communities vulnerable to extreme weather impacts.