Have you ever interested how to build a house? How to plan it, what holds up the ceilings and the walls, what keeps the rain out, which and how much materials required and how much human resources required. In the U. S. there are more than 100 million housing units, and most of them are "single family habitations," or just houses. In towns, in the suburbs and in country settlements, houses are a very common thing,¬ so home construction and repair became very profitable industry with much people involved. The modern family house has so many systems and facets of construction then one can't imagine. Learning all the basic knowledge requires sufficient study and 'Do It Yourself' movement in the end of past century helped it much.
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