As with the stations, the houses for NZASM employees were designed by type, each according to the status of the employee. It must also be stated that these were invariably white and mainly Dutch immigrants. Types were distinguished by alphabetical codes. Hence Type A houses were twelve room dormitory roomed lodgings for single employees. Type A1 was similar but had only eight rooms. Type B and B1 and the somewhat larger Type C and C1 were either stand alone or, more typically, semi-detached cottages for married workers having higher ranking. Employees of status, such as doctors and managers had custom designed homesteads. The masonry was invariably locally sourced stone with all timber, iron and fittings being imported. Variations in the designs reflected the locality, houses in the Lowveld having ventilated double roofs, an idea imported from the earlier Dutch railway venture in Indonesia. Initially much of the construction would have been of prefabricated wood and iron, but as development took place, more permanent dwellings were constructed to the exacting technical requirements and material specifications of the NZASM. Because of this many such structures still exist and are occupied.