Renter: Existing cavities. In walls and in both small and large stones. Each nest will contain between 1-33 brood cells. The cell partitions are made of sand and small stones. Although the species is essentially solitary, several may nest together in suitable crevices. Nests contain 1-33, mostly 3-8 cells. (Westrich, 1989).
Nesting material: Entire cells are made from rather coarse pebbles cemented together with mud. The nest is covered by an outer coat of mud and small pebbles. (Banaszak & Romasenko, 2001; Stanisavljević, 2000; Benoist, 1931; Bonelli, 1971; Eickwort, 1973, 1975; Friese, 1923; Gerstaecker, 1869; Le Goff 2004b; Müller et al., 1997; Westrich, 1989)