Does anyone know of any legislation that says objects (like planters) must not be placed on balconies in such a way that they render the balustrade climbable? Given the current campaign on childproof windows, this would have to be the logical next step.
No, but this line of reasoning could lead to some counterproductive outcomes.
Chairs, benches, etc. – moveable and climbable.
Tables, stands – moveable and climbable.
If the safety “logic” follows that line then might as well permanently bolt or lock closed the access door out on to the balcony and be done with it???