On this picture windows project in Shotton, opening survey is the first installation control and we check the existing opening, frame position and surrounding finishes before final dimensions are confirmed. Kaizen Windows & Doors links cill projection to opening dimensions, glass specification, frame support, drainage and perimeter sealing, making sure 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 picture windows scope. We also review perimeter sealing before making good and form a continuous weather-resistant seal around the external frame perimeter, with opening survey kept as the lead check for this picture windows scope. Finally, restrictors is checked so we can configure restrictors where controlled opening forms part of the brief, helping deliver a broad glazed area with the frame and glass coordinated to the opening, with opening survey kept as the lead check for this picture windows scope.