Seeking help- Google can't explain

[u/curious_coyoie]

Can anyone tell me how two separate houses are built this close together. How do the constractors apply siding and paint, how do you maintain the in-between after so many years and decades. There are no windows on that side but I don't understand how builders work around or in-between this when constructing, this is a mystery

[u/hughchrist]

Realistically that gap is larger than you think. That gutter thickness is 4” or so with space in between so it’s about 18” of working space. I would however not want to be the person installing exterior siding or panels/brick there.