The black-chested snake eagle nests in trees (typically in the crown of flat-topped acacia, although there is one record of the species nesting in the pine Pinus patula), and typically builds its nests concealed in mistletoe or epiphytic vegetation. The nest itself is a small stick structure. The female will lay only one egg per clutch, which is white and unmarked in appearance. The egg is incubated for 52 days, with the female performing the incubating alone while the male provides her with food. After hatching, the chick remains in the nest for approximately 3 months (90 days). Breeding occurs year-round, although it peaks during the dry winter months in South Africa; in the Kgalagadi Transfrontier Park, the peak time of egg laying has been reported to be between June–July, whereas eggs are laid slightly later in the former Transvaal, around July–August. In Zimbabwe and Zambia, nests containing eggs have been found from February to December, with a peak around April–July (in Zambia) and July–September (in Zimbabwe).
