Red-browed Treecreepers nest in pairs or in groups which usually consist of a breeding female, a primary male and two male helpers. The helpers are young that stay with the parents. Nests are in hollows in a near-vertical tree trunk or limb. The nest is built at the bottom of the hollow. It is made of bark fibre, dry grass or vegetable fibre, and has a lining, usually of fur. The female builds the nest, initially, but the male(s) help. The female incubates the eggs, while the male(s) feed her. All feed the young.