For new-build uPVC windows in Burscough, the technical sequence begins with trickle vents, so we integrate background ventilators with the frame head, room use and internal finish where specified, with trickle vents kept as the lead check for this new-build windows scope. We then use final checks to coordinate structural openings, cavity closures, damp interfaces, frame setting-out and render or masonry finishes, and we open, close, lock and inspect each installed window before the work is handed over, with trickle vents kept as the lead check for this new-build windows scope. Before closure, sill level is reviewed and we coordinate the frame base with the internal sill or window board and the external weathering detail, with trickle vents kept as the lead check for this new-build windows scope. The handover also covers packers; we support the frame at suitable points so fixing does not pull it out of line. Together these checks support new-build windows coordinated with the surrounding wall construction before closure.