For this bay windows project in New Mills, opening checks, frame fitting and finishing are treated as one sequence. Sill Level leads the review, 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 bay windows scope. We use frame alignment and glass specification around bay geometry, frame angles, head support, sill or base line and internal reveals, ensuring we check the frame for line, level and square before glazing and final tightening and match glazing type and pane configuration to the intended room use and project specification, with sill level kept as the lead check for this bay windows scope. The last technical check is 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 bay windows scope. This supports a bay-window assembly with linked frames aligned around the existing geometry.