Abstract: A tray-like modular building component adapted for filling with concrete after assembly with like components into a building frame, said tray-like modular building component comprising: a substantially rectangular frame with a pair of opposed sides and a pair of opposed ends defining an interior therebetween; a sheet mounted to said building frame and extending over said interior; a pair of beams, each mounted to said building frame along each said pair of sides respectively; and a pair of end plates, each mounted to said building frame along each said pair of ends respectively, wherein said sheet, said pair of beams and said pair of end plates together form an open-topped tray for receiving the concrete therein.

Abstract: A method of constructing a modular building, the method can include the following sequential steps: constructing a multi-floor building frame by connecting a plurality of like open topped-trays and column assemblies, with the trays forming floors and the column assemblies separating the floors; assembling walls or walls formwork to the frame; and pouring wet concrete into the trays to form the building.