Breeding mainly takes place between October and February. It nests in crevices such as holes in trees and out-competes other birds seeking to use these holes. It may also use other cavities for nesting. It adds coarse material such as twigs into the cavity until the platform is close to the entrance, after which it adds a lining of dry grass, dung and snake skins. It often uses the same nest over multiple breeding seasons.
The cape glossy starling is a monogamous, cooperative breeder, meaning that the breeding pair may be assisted by up to 6 helpers, who often remain with them through many breeding seasons. It lays 2 - 76 eggs, which are incubated solely by the female. It is a host to the greater honeyguide, a brood parasite that lays its eggs in other birds' nests.
The chicks are fed by both parents and helpers. They can be given grasshoppers, locusts, ants and beetles, and were also given fruit, insect larvae and other small invertebrates. Chicks leave the nest after about 20 days, afther which they remail with the group for at least a week.

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