Abstract: A system and method for erecting walls and foundations upon a base support from structural components, including a track assembly secured to a base support, a plurality of carrier assemblies each engagable with the track assembly to permit movement of the carrier assembly along the track assembly, each carrier assembly including a component engaging assembly for engaging a component, the carrier assembly adapted to be movable when a structural component is engaged therewith to a desired location along the track assembly, and adjusting means operable when the carrier assembly and the structural component engaged therewith have been moved to the desired location to prevent further movement of the carrier assembly along the track assembly and to secure the carrier assembly and the structural component engaged therewith in place at the desired location along the track assembly.