I am designing a staircase to be built inside a house. At the moment I am not concerned about materials or supporting structure but rather with the usability and safety. I realize I may not build a perfect staircase which is compliant with the code due to space constraints.
I have read a few articles about the requirements for safe stairs, such as angle, raiser height, tread depth, overhang length and walk line.
Based on what I have read and the set of constraints imposed by the location where the staircase has to fit, I came up with a design. I do see a few limitations of this design. Specifically, I am concerned about the following:
- Some stairs have width at walk line of just ~17cm(6.6"). I've read the minimum required is ~25cm(10"). Is this going to be much of an issue?
- I am not sure if I have measured the distance to the walk line correctly (please see the screenshot). Please correct me if this is wrong.
- Some stairs are 10cm(~4") wide at the narrow end. Is this acceptable?
- Rise is 19cm(~7.5"). Is this acceptable?