What requirement mandates federal design standards for new housing projects containing four or more units?

The correct answer is based on the Fair Housing Act (FHA), which mandates that any new residential construction containing four or more units must adhere to specific design standards that ensure accessibility for individuals with disabilities. The FHA aims to eliminate housing discrimination and promote equal opportunity, specifically addressing the needs of handicapped individuals. This includes requirements for features such as accessible entrances, doorways, and routes within the housing structures, making it essential for developers and builders to comply with these regulations during the construction of multi-family housing.

While the Americans with Disabilities Act (ADA) also addresses accessibility, it primarily applies to public accommodations and commercial facilities rather than residential buildings. The Environmental Protection Agency (EPA) focuses on environmental quality and regulations, and the Department of Housing and Urban Development (HUD) oversees various housing programs but does not specifically set design standards for accessibility in new residential housing projects as mandated by the FHA. Thus, FHA is the most relevant legislation regarding design standards for new housing projects containing four or more units.