This bill amends the Housing and Community Development Act of 1974, designating the Secretary of Housing and Urban Development as the primary authority for establishing federal manufactured home construction and safety standards. It also expands the definition of these standards to explicitly include energy efficiency , broadening the Secretary's purview. Any other federal agency seeking to establish new manufactured home standards must submit a proposal to the Secretary of HUD and obtain approval before implementation. The Secretary is required to reject proposed standards if they would significantly increase manufacturing costs, conflict with existing HUD standards, or for other determined reasons. This legislation aims to centralize regulatory control and prevent the imposition of potentially costly or conflicting requirements from various federal entities.