This bill, known as the "Build Housing Affordably Act," seeks to mitigate the effects of the Build America, Buy America Act (BABA) on the development of affordable housing. It directs the Secretary of Housing and Urban Development (HUD) to conduct a comprehensive study on BABA's impacts, specifically examining the direct and indirect costs incurred by grantees, builders, and developers, as well as costs associated with compliance, delays, and any housing units left unbuilt due to these requirements. The study will also scrutinize HUD's BABA waiver process, including review policies, processing times, the number of waivers granted, and the effectiveness of various waiver types, such as general public interest and de minimis waivers. Following the study's completion, HUD must submit a detailed report to the House Committee on Financial Services and the Senate Committee on Banking, Housing, and Urban Affairs within 90 days. A key provision of the bill is the immediate, temporary pause on BABA requirements for "covered projects"—affordable housing initiatives funded by specific federal programs—until 60 days after HUD delivers its report to Congress. Furthermore, the bill establishes a strict 90-day timeframe for HUD to render decisions on BABA waiver requests for these projects; if HUD fails to act within this period, the waiver is automatically granted and deemed final and irrevocable. "Covered projects" encompass a wide array of residential housing efforts assisted by programs like public housing, Section 8, and the HOME Investment Partnerships program.