Can there be a doorway under the stairs of a self-built house?

No doorways are allowed under the stairs of self-built houses.

1. Opening the door under the stairs of a self-built house will affect everyone entering and exiting the door, and the structure of the house will be greatly changed as a result, and the space may be less;

2. If the stairs The building is unstable and people going in and out are at risk of being crushed by the stairs.