System and method for configuration of buildings or storage

A reconfigurable modular building system, comprising:

• a plurality of containers, the containers being disposed in stacks within a framework structure forming a support structure of the modular building system, the framework structure including:
• a series of substantially vertical uprights having a substantially horizontal grid mounted thereon, the grid including two substantially perpendicular sets of rails on which at least one load handling device is operable, the load handling device including a body mounted on wheels, a first set of wheels are arranged to engage with at least two rails of a first set of the rails, the second set of wheels are arranged to engage with at least two rails of a second set of the rails, the first set of wheels are independently moveable and driveable with respect to the second set of wheels such that when in motion only one set of wheels is engaged with the grid at any one time thereby enabling movement of the load handling device along the rails to any point on the grid by driving only the set of wheels engaged with the rails, the containers are configured with an interior structure adapted to perform specific functions, the specific functions are selected from a plurality of available functions, each stack including containers of any number of different selected functions, the stack is adapted to be reconfigurable on demand to include containers of alternative functions, the containers in the stacks are arranged such that each container supports the container immediately above in the stack.