Revisions log for Answer #661

You could also call it on-site fabrication: that is, formed/welded/created at the construction site. I would probably assemble the pipe in the example photo from concrete, aerated concrete, steel beams, square pipes, and drywall.

This can also be done by a carpenter, for example, with columns of beams lined with plasterboard (cross-section including plaster can be less than 30 cm). However, the connection of these columns to the floor will be "non-trivial".

However, keep in mind that the carport in the example photo you used, in terms of budget will come out golden.

I wouldn't want to cover the space with such a carport, because the house needs light, and visually the main entrance becomes a side entrance, if only because of the "hidden" location.