For this ventilated window replacement project in Rainhill, opening checks, frame fitting and finishing are treated as one sequence, with opening configuration kept as the lead check for this ventilated window replacement scope. Opening Configuration leads the review, so we confirm fixed and opening sections against ventilation, access and furniture or worktop positions, with opening configuration kept as the lead check for this ventilated window replacement scope. We use ventilation and final checks around vent positions, frame head, room ventilation strategy, curtains or blinds and internal finish, ensuring we coordinate window opening and background ventilation with the room's intended use and open, close, lock and inspect each installed window before the work is handed over, with opening configuration kept as the lead check for this ventilated window replacement 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 opening configuration kept as the lead check for this ventilated window replacement scope. This supports window ventilation incorporated without treating it as an afterthought to the frame installation.