Being built from a panel system means the units can easily be modular in form and added onto at any time. If the unit becomes too small or needs extra space this is possible with adding modular panel sections.
This aspect additionally makes it easier for the transport of larger units that would otherwise be considered too difficult or not worth while. The move is made in modular sections of halves or thirds. Adding a whole panel delta section makes the verandah for the modern unit.
The designs ensure the extendions can happen on the length or depth (side) of the unit. One can continue to increase in the depth (above) and the other in length (left). Sizes range by increasing either 1.2 metres or 0.6 metres. This includes the option of having an ensuite in the unit.