Design drawing of a semi-detached staircase

Quick answer：

A semi-detached staircase design drawing typically refers to architectural plans or illustrations showing the layout and structure of a staircase connecting two separate levels in a residential building. These designs often include details such as the type of staircase (straight, curved, or L-shaped), dimensions, railings, and handrails. They are crucial for builders and architects to ensure proper construction and safety.