For this render-interface windows project in Moreton, opening checks, frame fitting and finishing are treated as one sequence. Sealant Joints leads the review, so we allow a practical perimeter joint for movement and a neat external seal line. We use external making good and frame position around render edge, frame position, external seal, sill projection and making-good zone, ensuring we finish external reveals, render or masonry interfaces around the installed frame and set the new frame at a position that works with the reveals, sill and external finish, with sealant joints kept as the lead check for this render-interface windows scope. The last technical check is cavity closure; we check the window perimeter where the opening meets cavity closers or insulated reveal construction, with sealant joints kept as the lead check for this render-interface windows scope. This supports a window-to-render junction detailed to keep the perimeter neat and weather-resistant.