4. Riser: usually those who walk up and down the stairs always step up or down equally in every step. Therefore, having a set of risers at the same height is very important in safety. The unequal set may be caused by problems with construction craftsmen or customization augmented by those without knowledge.
5. Thread: like the riser, the thread should have the same width. In response to the walking behavior of stairs users.
6. Sufficient lighting: the stairs can be placed in various positions of the house, according to the layout and design guidelines. But must consider the lighting used to facilitate walking up and down the stairs. Which can be both light from the lamp or natural light received from glass windows that are usually located near the stairs. A staircase with solid walls covering both sides may require risers that is transparent, which means it has only threads. To receive light from nearby areas Which depend on the design guidelines
All these issues, both as required by law or not. They are a checklist for homeowners to consider for safety. As for any homeowner who is designing a new house or buy a new home from various developers, may not have to worry much because the house designed by the architect will have a safe staircase design and already according to the law.