So when did the house become something other than a house?
This particular behaviour is called a "gish gallop" (you can google it).
It is an example of disingenuous debating and an inability to stick to the topic.
When did a reptile stop being an amphibian? When did we stop being an ape?
Or to answer a stupid question with a stupid answer:
When there are so many skylights we call it a greenhouse. No one additional skylight makes it not a house but at some point we would classfy it as a greenhouse.