Window performance on this bay windows installation in Wallasey depends on more than the frame profile. We start with frame position and set the new frame at a position that works with the reveals, sill and external finish. fixing points is then coordinated through bay geometry, frame angles, head support, sill or base line and internal reveals, so we position frame fixings to suit the opening, frame profile and surrounding substrate, with frame position kept as the lead check for this bay windows scope. Before final finishing, we review sealant joints and allow a practical perimeter joint for movement and a neat external seal line, with frame position kept as the lead check for this bay windows scope. We finish with trims and coordinate internal or external trims with reveals, frame position and adjoining finishes, supporting a bay-window assembly with linked frames aligned around the existing geometry, with frame position kept as the lead check for this bay windows scope.