PROBLEM TO BE SOLVED: To secure an effective internal dimension for providing housing equipment, passages and fittings in response to a case where the wall thickness of a wall at an arbitrary position of a building becomes large. SOLUTION: When the wall thickness of walls 11 and 12 arranged at arbitrary positions on a plan of a building is set to be large, one side of a reference line along which the walls 11 and 12 to which the wall thickness is set to be large is set large. As a module on one side or the other side, for example, a widening module of 967 mm larger than the reference dimension 910 mm is set to widen the width of the module, and the widening module is orthogonal to the first direction or the first direction in the plane plan. Apply continuously in the second direction. [Selection diagram] Fig. 1
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