Prefabricated building systems and elements thereof

A prefabricated building assembly, comprising:

• a plurality of prefabricated wall panel subassemblies, each of the plurality of prefabricated wall panel subassemblies having an interior face, an exterior face, a top surface, a bottom surface, and two side surfaces opposite one another, each of the plurality of prefabricated wall panel subassemblies comprising,
• a metal base angle subframe, the metal base angle subframe comprising:
• a structural angle having an L-shaped profile, a first flange of the structural angle extending in a first direction perpendicular to a second flange of the structural angle extending in a second direction, the structural angle extending lengthwise in a third direction, perpendicular to both the first and second directions, along the bottom surface of a prefabricated wall panel subassembly;
• a plurality of metal straps, each extending in the first direction toward the top surface of the prefabricated wall panel subassembly;
• and
• a structural wood subassembly having a bottom surface disposed on the second flange and an exterior face disposed against the first flange, the structural wood subassembly fastened to each of the plurality of metal straps of the metal base angle subframe;
• a plurality of load bearing beam structures each having a direction of longitudinal extent and a cross-sectional shape extending in a vertical direction and a horizontal direction, both the vertical direction and the horizontal direction perpendicular to the direction of longitudinal extent, each load bearing beam structure configured to support a load having a component aligned substantially with the vertical direction, each of the plurality of load bearing beam structures inserted in a corresponding void of each of a subset of the plurality of prefabricated wall panel subassemblies;
• and
• a plurality of prefabricated roof panel subassemblies disposed above and attached to the load bearing beam structures.