Renter: Existing cavities. Nests in existing cavities (eg beetle emergence holes).
Females nest in all kinds of suitable cavities: fissures in mortar of an old wall (Gardner, 1901c), in burrows in a sandpit (Blair, 1920) and sandbanks (Chambers, 1949). Specimens have also been discovered in cavities in flint stones (G.M. Spooner, pers. comm.) and a hole in a brick (female in NHML); it is possible that these niches were to be used as nesting sites.
On the continent, the species has been reported nesting in dead Rubus stems (Benoist, 1959), and Crataegus wood (V. Lefeber, pers. comm.). There is a record of the species utilising a vacated cell of the bee Megachile (Chalicodoma) parietina and also of a wasp in the genus Trypoxylon (Westrich, 1989).