For this low-sill windows project in Garston, opening checks, frame fitting and finishing are treated as one sequence. Internal Sealing leads the review, so we close the internal frame perimeter cleanly before trims or making-good work is completed, with internal sealing kept as the lead check for this low-sill windows scope. We use gaskets and final checks around sill height, glass specification, opening configuration, restrictors and internal trim, ensuring we check glazing and sash seals for continuous seating before final handover and open, close, lock and inspect each installed window before the work is handed over, with internal sealing kept as the lead check for this low-sill windows scope. The last technical check is sill level; we coordinate the frame base with the internal sill or window board and the external weathering detail, with internal sealing kept as the lead check for this low-sill windows scope. This supports a low-sill installation planned around safe glazing and practical opening operation.