A fabricated building includes a plurality of vertically extending guide members and a plurality of building blocks arranged with the aid of said guide members to define a wall structure. Each block has a first end provided with a vertically extending guide hole having one of the guide members extending therethrough, and a second end coupled to a first end of a horizontally adjacent block. The fabricated building also includes a first threshold defining a first guide hole having one of the guide members extending therethrough and a second guide hole having one of the guide members extending therethrough. The fabricated building also includes a second threshold defining a first guide hole having one of the guide members extending therethrough and a second guide hole having one of the guide members extending therethrough. The first threshold and the second threshold define a frame space therebetween.