Conflict with other laws. This chapter is not intended to repeal, abrogate, annul or in any way impair or interfere with existing provisions of other laws or ordinances, except those repealed expressly or by necessary implication hereby, or to affect any private restrictions placed upon property by covenant, deed or other private agreement unless repugnant hereto. Whenever a requirement of this chapter conflicts with another requirement of this chapter or with the requirements of any other laws or ordinances, the highest or most restrictive standard shall apply unless prohibited by law.