The invention relates to a system for building houses by making them integrally of prefabricated elements. The house made according to the system of the invention comprises some pillars (A) embedded into the bodies of a foundation, joined by some longitudinal and cross beams (B and C), respectively, levelled within a framework or overlapped, on which there is placed a ceiling (D) on which and below which there are closed some rooms confined by some walls (E) and a roof made of some panels (F and F') on a roof framing or an arched frame.
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