As with the shirt example in the original article, the cost of labour (i.e. paying people for their time) represents the majority of the cost in building a house. The other items you list are using cheaper overseas labour in their construction, whereas if you're building a house by definition you need to pay local craftspeople for their time. Also due to their physical size, houses require lots of people to put together (i.e. the time is in some sense proportional to size of the item being constructed).
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