For this tilt-and-turn windows project in Sandbach, opening checks, frame fitting and finishing are treated as one sequence. Glazing Packers leads the review, so we support glass units correctly within opening sashes and fixed lights before beads are completed, with glazing packers kept as the lead check for this tilt-and-turn windows scope. We use opening survey and cill projection around frame size, opening clearance, handle position, restrictors and surrounding reveals, ensuring we check the existing opening, frame position and surrounding finishes before final dimensions are confirmed and set the cill projection and end details to suit the opening and surrounding finish, with glazing packers kept as the lead check for this tilt-and-turn windows scope. The last technical check is perimeter sealing; we form a continuous weather-resistant seal around the external frame perimeter, with glazing packers kept as the lead check for this tilt-and-turn windows scope. This supports tilt-and-turn windows with enough clearance for both operating modes.