The minimum requirements set out in RCW
71.09.285 through
71.09.340 are minimum requirements to be applied by the department. Nothing in this section is intended to prevent a city or county from adopting development regulations, as defined in RCW
36.70A.030, unless the proposed regulation imposes requirements more restrictive than those specifically addressed in RCW
71.09.285 through
71.09.340. Regulations that impose requirements more restrictive than those specifically addressed in these sections are void. Nothing in these sections prevents the department from adding requirements to enhance public safety.