For this landing windows project in Belper, opening checks, frame fitting and finishing are treated as one sequence. Removal Sequence leads the review, 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 landing windows scope. We use frame dimensions and packers around installation access, sill height, handle reach, restrictors and internal reveals, ensuring we confirm manufacturing dimensions against the surveyed opening before the replacement frame is ordered and support the frame at suitable points so fixing does not pull it out of line, with removal sequence kept as the lead check for this landing windows scope. The last technical check is handle positions; we check handle height and access against the room layout and opening style. This supports landing glazing fitted around practical access and controlled operation.