The aim of this paper is a new formulation of the configurational force balance in the general framework of thermomechanics. To this end, invariance requirements of the configurational working are used, following an approach proposed by Gurtin. To define the notion of working in a more general framework, the ideas of Green and Naghdi concerning the basic postulates of thermomechanics are invoked and used consistently. The main results are that the configurational forces balance in the general setting of thermomechanics without the invocation of constitutive relations and the pseudo–momentum equation for classical and dissipationless thermoelasticity. Finally, we give an application to fracture theory. We show that in classical thermoelasticity the derived pseudo–momentum balance provides a crack–driving force consistent with the well–known expression of the energy–release rate.