Outline the lawn and see what water-wise planting would cost, how much less it drinks once established, and when the change pays for itself.
Once established, mulched beds of water-wise indigenous plants on drip use roughly a third of what a kikuyu lawn under sprinklers does, and much of that the rain covers. In their first year, while the roots go down, they need about twice their later amount. The calculator works out both from the climate recorded at your address.
Built up from the parts, about R285 a square metre for lifting the lawn, compost, ground covers and small shrubs at three or so a square metre, bark mulch and dripline, plus about R90 a square metre if a landscaper lays it out and plants it. A designed and installed garden can cost twice that; planting smaller and letting the plants fill in costs less.
Local ones suited to your rainfall. Winter-rainfall gardens in the Western Cape suit fynbos, restios and vygies; summer-rainfall Highveld gardens suit aloes, wild garlic, plectranthus in shade, and grasses like Themeda. A local indigenous nursery will know what grows on your soil.
Different work. There is no mowing, but beds want weeding while the plants close in, some pruning, and a mulch top-up every year or two. The calculator counts a small yearly cost for that against what the lawn costs to keep.