Are there any laws against building a concrete wall right up against your house??
Answers:
most cities require some sort of building permit, not sure exactaly what hes doing but if he has a permit hes good if not call your city hall and they will direct you to the proper department and tell them your concerns.
Other answers:
You should check with the home owners association. I would say yes.
You should check with the home owners association. I would say yes.
You could check the building codes for your city.
This depends on where you live and what, exactly he's building, but in general there are ordinances about this kind of thing. Most places require you to get a building permit. That means you have to get official approval for your plan.
yes it isn't allowed. there is a certain amount of distance between the perimeter and your house. your can ask the city ( building and permit ) on what the proper distance is . fines might be paid should there be an accident and they might ask you to tear it down anyway. in CA, the house wall and perimeter wall should be 5 feet apart.