There is no additional cost of a workforce in a factory making panels.
There is no additional cost of haulage to site
There is no additional cost for cranes, telescopic handlers, which is needed on a Kit Build, Stick Build is all man-handled with loose timber.
A lot more storage area is needed to store panels on site, also access is needed for cranes etc.
If a base is made slightly out of level, the sole-plate will have to be packed up until it is level. When a Timber Frame Manufacturer has made the panel in the factory, they have no way of knowing how much the sole-plate has been packed. This can cause problems for the brick layer at a later stage with window & door heights among other problems. With a Stick Build any problems that occur like this can be rectified on site as they arise.
There is a lot more flexibility in constructing a Stick Build on site, any non load bearing partitions can be adjusted if the client requires, or even work to the bricklayers foundation base. This cannot be done with the Kit System.
The Stick Build method is equally as quick to erect as a Kit, as more labour is present on site.