Insofar as permitted by Article VIII, Section 5 and Article VIII, Section 7 of the Constitution of Virginia, in any county operating under an optional form of organization and government provided for in Chapter 6 (§ 15.2-600 et seq.) of Title 15.2, the board of supervisors of such county, at the request of the county school board, may transfer the maintenance of school buildings and grounds and operation and maintenance of school buses from the department of education to the department of public works; and such board of supervisors, at the request of the county school board, may authorize the construction of new school buildings and additions to existing school buildings under direction of its department of public works.