(1) Environmental modifications are physical adaptations to the home, required by the child's plan of care, which are necessary to ensure the health, welfare, and safety of the child, or which enable the child to function with greater independence in the home, and without which the child would require institutionalization.

(2) Environmental modification services are measures that provide the child with accessibility and safety in the environment so as to maintain or improve the ability of the child to remain in community settings and employment.