Every handrail and guardrail must be firmly fastened, and must be maintained in good condition, capable of supporting the loads to which it is subjected, and meet the following requirements:

1. A. Handrails and guardrails required by building codes at the time of construction must be maintained or, if removed, must be replaced.
2. B. Where not otherwise required by original building codes, exterior stairs of more than three risers that are designed and intended to be used as part of the regular access to the dwelling unit must have handrails. Interior stairs of more than three risers must have handrails. When required handrails are installed they must be installed so that they meet the applicable building code requirements in effect at the time this work is being performed.
3. C. Where not otherwise required by original building codes, porches, balconies or raised floor surfaces located more than 30 inches above the floor or grade below must have guardrails. Open sides of stairs with a total rise of more than 30 inches above the floor or grade below must have guardrails. When required guardrails are installed, they must be installed so that they meet the applicable building code requirements in effect at the time this work is being performed.