For egress-focused bedroom windows in Clitheroe, the technical sequence begins with packers, so we support the frame at suitable points so fixing does not pull it out of line, with packers kept as the lead check for this egress-focused windows scope. We then use opening configuration to coordinate sash dimensions, hinge arrangement, clear opening, handle access and restrictors, and we confirm fixed and opening sections against ventilation, access and furniture or worktop positions, with packers kept as the lead check for this egress-focused windows scope. Before closure, gaskets is reviewed and we check glazing and sash seals for continuous seating before final handover, with packers kept as the lead check for this egress-focused windows scope. The handover also covers opening survey; we check the existing opening, frame position and surrounding finishes before final dimensions are confirmed, with packers kept as the lead check for this egress-focused windows scope. Together these checks support an opening configuration coordinated around the specified clear-opening requirement.