Window performance on this pre-decoration windows installation in Withnell depends on more than the frame profile. We start with opening survey and check the existing opening, frame position and surrounding finishes before final dimensions are confirmed, with opening survey kept as the lead check for this pre-decoration windows scope. cill projection is then coordinated through internal reveals, trims, plaster repairs, sealant and decoration order, so we set the cill projection and end details to suit the opening and surrounding finish, with opening survey kept as the lead check for this pre-decoration windows scope. Before final finishing, we review sealant joints and allow a practical perimeter joint for movement and a neat external seal line, with opening survey kept as the lead check for this pre-decoration windows scope. We finish with trickle vents and integrate background ventilators with the frame head, room use and internal finish where specified, supporting window installation handed over ready for the planned internal finishing stage, with opening survey kept as the lead check for this pre-decoration windows scope.