On and after December 19, 1963, necessary expenses of inspections and of providing representatives at the site of projects being planned or undertaken by local public agencies pursuant to title I of the Housing Act of 1949, as amended [42 U.S.C. 1450 et seq.], projects financed through loans to educational institutions authorized by title IV of the Housing Act of 1950, as amended [12 U.S.C. 1749 et seq.], projects and facilities financed by loans to public agencies pursuant to title II of the Housing Amendments of 1955, as amended [42 U.S.C. 1491 et seq.], urban planning financed through grants to State and local government agencies pursuant to chapter 35 of title 40, and reserves of planned public works financed through advances to municipalities and other public agencies pursuant to chapter 35 of title 40, as amended, shall be compensated by such agencies or institutions by the payment of fixed fees which in the aggregate will cover the costs of rendering such services, and expenses for such purpose shall be considered nonadministrative; and for the purpose of providing such inspections, the Secretary of Housing and Urban Development may utilize any agency and such agency may accept reimbursement or payment for such services from such institutions, or the Secretary, and shall credit such amounts to the appropriations or funds against which such charges have been made.