Balcony railings must be designed to prevent children from climbing, and the clear distance between vertical bars should not exceed 0.11 meters.
Firstly, common low window sills are about 0.5 meters from the ground. Adding a 0.4-meter railing or fence close to the interior wall will certainly meet the required safety standards. If the window sill is too large, such as a bay window, children often stand on the sill to look out, and users must also stand on the sill to open the window. In this case, the railing attached to the window sill should be at least 0.9 meters high.
The clear height of balcony railings or balustrades should not be less than 1.05 meters for buildings of six stories or less; and not less than 1.10 meters for buildings of seven stories or more. Furthermore, solid balustrades are recommended for buildings of seven stories or more and for buildings in cold or severely cold regions. Of course, different locations will have different heights. For example, the height of a balcony railing in a kindergarten will be different from that in a home. Therefore, this should be considered when making your choice.