Receivers and managers are preparing for an increase in workloads as investors default on loans when pre-sales of residential projects fail to materialise.

One of the highest-profile collapses has been the Raylan Group, but there are more projects in the wings that are teetering on the edge, according to receivers and managers.

Fuelling the forecast rise in defaults is a reluctance by the non-bank lenders to extend credit. Some have now drawn up "no go" lending zones across Sydney and Melbourne.

A land bank at 44-46 Maple Road, Casula in Sydney's west is being sold by receivers.

Allen Walker, a partner at receiver and manager Cor Cordis, said he is anticipating more business will come from loan defaults in the coming months.