Rules and expressions are presented for the calculation of the flexural and shear strength, the secant stiffness to yield point and the cyclic deformation capacity of concrete members retrofitted with fiber reinforced polymer (FRP) or concrete jackets, including the case of lap splicing of the longitudinal bars of the original member within the plastic hinge region. They are developed/calibrated on the basis of test results for retrofitted members, including pre-damaged ones. They represent an advancement over rules proposed earlier by the same authors and adopted in Annex A of Part 3 of Eurocode 8 for the retrofitting of concrete members.