Abstract: The present invention relates to components and method for modular building system used as houses, home flat, buildings, offices, gazebos, and pavilion, and to assemble the modular building system fast, easy and simple. Specifically a modular building system of the present invention includes structural frames for post and beam of the building system, lock mechanism for connecting and keeping rigidly said structural frames, corner support for connecting the corner of said structural frames, and structural insulated panel for the purpose wall, roof and floor. The structural frame consists of at least a groove and at least pair of bevel surface. Further the lock mechanism includes a top shell, a bottom shell, a tension screw, at least one pair of reed, at least one pair of support pieces, and at least one pair of fill pieces. And also a method for assembling said modular system is provided.

Abstract: The present invention relates to components and method for modular building system used as houses, home flat, buildings, offices, gazebos, and pavilion, and to assemble the modular building system fast, easy and simple. Specifically a modular building system of the present invention includes structural frames for post and beam of the building system, lock mechanism for connecting and keeping rigidly said structural frames, corner support for connecting the corner of said structural frames, and structural insulated panel for the purpose wall, roof and floor. The structural frame consists of atleast a groove and atleast pair of bevel surface. Further the lock mechanism includes a top shell, a bottom shell, a tension screw, atleast one pair of reed, atleast one pair of support pieces, and atleast one pair of fill pieces. And also a method for assembling said modular system is provided.