Position the new door against the frame to determine the fit. Use a pencil to mark any overlap if the door is larger and requires cutting. To retain the pattern in the door, remember to cut from the top and bottom and from each side when cutting. This is particularly important on a panel door to keep the panels central.

Use a plane to smooth the edges, working from the ends towards the middle to avoid any splintering at the edges. If a larger section needs cutting off, use a circular or panel saw to make the cut. The door should fit the frame with a gap of approximately 2mm all round the edge.