For rear-elevation window replacement in Bridgnorth, the technical sequence begins with sill level, so we coordinate the frame base with the internal sill or window board and the external weathering detail, with sill level kept as the lead check for this rear-elevation replacement scope. We then use drainage paths to coordinate opening sizes, room functions, sill heights, access and external sealing, and we keep designed frame drainage routes clear through installation and external finishing, with sill level kept as the lead check for this rear-elevation replacement scope. Before closure, locking points is reviewed and we align sash locking points and keeps so the window closes evenly around the frame, with sill level kept as the lead check for this rear-elevation replacement scope. The handover also covers external making good; we finish external reveals, render or masonry interfaces around the installed frame, with sill level kept as the lead check for this rear-elevation replacement scope. Together these checks support rear windows coordinated around the way the adjoining rooms are used.