(a) To provide for the development of affordable housing in this state, the department, through the colonia self-help centers established under Subchapter Z or a nonprofit organization certified by the department as a nonprofit owner-builder housing program, shall make loans for owner-builders to enable them to:
(1) purchase or refinance real property on which to build new residential housing;
(2) build new residential housing; or
(3) improve existing residential housing.
(b) The department may adopt rules necessary to accomplish the purposes of this subchapter.