How to use the passage formed by the two courtyard walls

It is specially set aside for drainage, and it is the most used area of ​​​​the two houses.

Everyone knows that the story of Sanchi Lane is like this, but some people build the wall directly. On this kind of road, first of all, it depends on who has the right to use the road. If both families have the right to use it, it can be negotiated. If the village collective has not assigned it to anyone, then it is illegal to build it like this, so it must be built. On permitted homestead land.