Componentised building and method of assembling a componentised building

A method of assembling a componentised building structure, the method comprising the steps of:

• a) securing a plurality of elongate base rails to a ground surface to define the location and orientation of a plurality of wall structures of the building structure, each elongate base rail having a longitudinal axis and comprising an elongate rail guide extending parallel to the longitudinal axis;
• b) positioning an assembly structure comprising at least one wall structural panel unit on at least one base rail, the or each wall structural panel unit having a rail engagement portion arranged at a lower end thereof and configured to engage with the rail guide to enable the assembly structure to slide thereon;
• c) sliding the assembly structure along at least a part of the length of the respective base rail in a direction parallel to the longitudinal axis of the base rail to a desired location of the assembly structure;
• and
• d) repeating steps b) and c) for further assembly structures to form the componentised building structure.