This chapter shall not prevent local authorities of any city, or city and county, within the reasonable exercise of the police power, from adopting rules and regulations, by ordinance or resolution, prescribing standards of sanitation, health and hygiene for establishments as defined in this chapter, which are not in conflict with the provisions of this chapter, and requiring a certificate by the local health officer, that the local health, sanitation and hygiene laws have been complied with before maintaining or conducting any such institution within such city or city and county.