The lesser swallow-tailed swift's breeding season varies geographically, with nesting generally in the local spring and summer. The nest is tubular, wider at the top, and with the entrance at its base. It is made of plant material felted with saliva and attached to a branch or a vertical surface. In the latter case, the entire length is fixed to the wall or trunk. Nests have been found under bridges, on the walls of occupied buildings and inside abandoned ones, and on large trees. Two or three white eggs are laid on a shelf in the upper part of the nest and incubated by both parents.
