The following regulations shall apply to house trailers:
(A) A house trailer shall not be considered to be permissible as an accessory building or as a principal building.
(B) No person shall park, store, or occupy a house trailer, except that a house trailer may be used as a temporary office or shelter incidental to construction on or development of the premises on which the trailer is located, only during the time construction or development is actively underway.
('69 Code, App. A, § 4.6)