Southern masked-weaver males are polygynous, they may mate with up to 12 females in one breeding season, from September through January. Also each female may rear more that one brood per season. They live in colonies with up to 9 males.
The nest is a kidney-shaped structure hanging from a branch with the entrance on the bottom. The male solely builds a nest, which is never used more than once. The nest is woven of grass, leaves or reeds. The male can build one nest in 9 - 14 hours.
After completion of the nests, the male will defend his small territory around his nests, displaying to the females, attracting their attention to his nests. If accepted by the female, he will add a short entrance tunnel, while the female lines the interior with soft grass heads and feathers. The female usually lays between 2-5 eggs, which are incubated only by the female for about 12 days. The male assists in feeding the chicks. They young fledge the nest when they are about 17 to 21 days old.
A male can build up to 25 nests in one breeding season.