For bay-window replacement in Scarisbrick, the technical sequence begins with opening survey, so we check the existing opening, frame position and surrounding finishes before final dimensions are confirmed, with opening survey kept as the lead check for this bay windows scope. We then use cill projection to coordinate bay geometry, frame angles, head support, sill or base line and internal reveals, and we set the cill projection and end details to suit the opening and surrounding finish, with opening survey kept as the lead check for this bay windows scope. Before closure, drainage paths is reviewed and we keep designed frame drainage routes clear through installation and external finishing, with opening survey kept as the lead check for this bay windows scope. The handover also covers glazing-packers; we support glass units correctly within opening sashes and fixed lights before beads are completed, with opening survey kept as the lead check for this bay windows scope. Together these checks support a bay-window assembly with linked frames aligned around the existing geometry.