For window replacement with render interface in Thornton, the technical sequence begins with fixing points, so we position frame fixings to suit the opening, frame profile and surrounding substrate, with fixing points kept as the lead check for this render-interface windows scope. We then use internal sealing to coordinate render edge, frame position, external seal, sill projection and making-good zone, and we close the internal frame perimeter cleanly before trims or making-good work is completed, with fixing points kept as the lead check for this render-interface windows scope. Before closure, installation access is reviewed and we plan handling and working access before existing frames are removed, with fixing points kept as the lead check for this render-interface windows scope. The handover also covers reveal dimensions; we check internal and external reveal depths so trims, plaster and handle clearances can be coordinated, with fixing points kept as the lead check for this render-interface windows scope. Together these checks support a window-to-render junction detailed to keep the perimeter neat and weather-resistant.