Thatch is wrong, a simplex is so calleed as its a single story "Bungalow" usually as part of a semi-detached or free standing estate to portray it UK terms.A Simplex is a cheap house.
And yes a lot of households still employ, house maids, gardeners etc. But not always fulltime and not always "live in"staff.
only 13 million of SA's 48 million population earn enough to pay income tax
so maids and gardeners are a part of most people lives.
and if you have children a live-in maid/childminder is very common.
when I left the minimum wage was R1200/month and I think thats now R2500 a month.