For this flush-sash windows project in Horwich, opening checks, frame fitting and finishing are treated as one sequence. External Making Good leads the review, so we finish external reveals, render or masonry interfaces around the installed frame. We use reveal dimensions and sealant joints around frame proportions, sightlines, opening sizes, glazing and external finish, ensuring we check internal and external reveal depths so trims, plaster and handle clearances can be coordinated and allow a practical perimeter joint for movement and a neat external seal line, with external making good kept as the lead check for this flush-sash windows scope. The last technical check is glazing beads; we check bead seating and corner joints after the glass is installed. This supports a cleaner flush-sash appearance with the installation coordinated around the existing openings.