For upper-floor window replacement in Leigh, the technical sequence begins with removal sequence, so we remove existing frames in a controlled order to protect the opening and adjoining finishes, with removal sequence kept as the lead check for this upper-floor windows scope. We then use frame dimensions to coordinate external access, frame handling, restrictors, sill height and making good, and we confirm manufacturing dimensions against the surveyed opening before the replacement frame is ordered, with removal sequence kept as the lead check for this upper-floor windows scope. Before closure, packers is reviewed and we support the frame at suitable points so fixing does not pull it out of line. The handover also covers handle positions; we check handle height and access against the room layout and opening style. Together these checks support upper-floor windows installed through a sequence planned around safe access and operation.