Kaizen Windows & Doors plans window replacement with render interface in Heswall around details that are harder to correct after finishing, with perimeter sealing kept as the lead check for this render-interface windows scope. The first control is perimeter sealing, and we form a continuous weather-resistant seal around the external frame perimeter. We then coordinate internal making good through render edge, frame position, external seal, sill projection and making-good zone and repair or finish internal reveals, sill zones and decoration interfaces around the new frame, with perimeter sealing kept as the lead check for this render-interface windows scope. Frame Dimensions is checked before closure, while head interface is included in final handover. We confirm manufacturing dimensions against the surveyed opening before the replacement frame is ordered and coordinate the frame head with the retained lintel, cavity closure and internal reveal, keeping the installation focused on a window-to-render junction detailed to keep the perimeter neat and weather-resistant, with perimeter sealing kept as the lead check for this render-interface windows scope.