A seat lift for a bath that includes a seat, a seat back hingedly connected to the seat, a torsion spring, and a guide means for guiding the seat in reversible movement between lower and upper positions. The guide means is configured so that movement between the lower and upper positions comprises both vertical and lateral movement of the seat relative to a base of the bath. The seat back may move between a first seat back position in which the seat back is substantially upright and a second seat back position in which the seat back is orientated so that a user is leaning backwards. The torsion spring biases the seat back to rotate around the hinge connecting the seat back to the seat toward the first seat back position. The torsion spring torque is smaller when the seat is in the lower position than in the upper position.