For window replacement with plastered reveals in St Helens, the technical sequence begins with sealant joints, so we allow a practical perimeter joint for movement and a neat external seal line, with sealant joints kept as the lead check for this plastered-reveal windows scope. We then use external making good to coordinate frame position, plaster edge, corner protection, sill finish and drying sequence, and we finish external reveals, render or masonry interfaces around the installed frame, with sealant joints kept as the lead check for this plastered-reveal windows scope. Before closure, frame position is reviewed and we 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 plastered-reveal windows scope. The handover also covers 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 plastered-reveal windows scope. Together these checks support plastered reveals finished cleanly around the replacement frame.