Explain what a built in frame is and what the joiner needs to do before it is built in?

A built-in frame refers to a structural element that is integrated into a wall or other architectural feature, providing support for doors, Windows, or cabinetry. Before it is built in, the joiner needs to ensure accurate measurements for the opening, prepare the necessary materials, and construct the frame to precise specifications. Additionally, the surrounding area should be prepped to ensure a secure fit and alignment once the frame is installed. Proper sealing and finishing may also be required to ensure durability and aesthetic appeal.