DIY Kingsize Bed Frame

Stand two planks of 84-inch 2-by-12 lumber on their 2-inch edge, 76 inches apart. Position two planks of 76-inch 2-by-12 lumber between the ends of the two 84-inch planks to make a large rectangle shape.

Glue the ends of the 76-inch planks to the 84-inch planks and set in corner clamps while the glue dries.

Pre-drill three pilot holes, sized to the shaft of the 2 3/4-inch screws, through the 84-inch planks into the 76-inch plank ends. Drive a 2 3/4-inch screw into each pilot hole to secure the frame together.

Slide a plank of 80-inch 1-by-6 lumber between the 76-inch ends of the frame, so that it cuts the frame into two even sections. Push the plank down so that it is flush with the base of the frame, with 6 inches between the top of the plank and the top of the frame. This is the central support plank for the bed slats.

Toe-screw (screw at an angle) the support plank to the frame, using two 2-inch wood screws on either side of each end of the support plank. That way you have screwed the plank in from the inside of the frame, and the ends of the frame are not marred by screw holes.

Position two planks of 80-inch 1-by-2 lumber 6 inches down from the top of the frame sides, at the same level as the top of the central slat support. These are the side slat supports. Secure the side slat supports in place with 2-inch screws driven every 5 to 6 inches along the length of the lumber.

Turn the frame over, so that the bottom of the frame is facing up. Position a piece of 15-inch 2-by-6 lumber on the ends of each side of the frame, flush with the corners. These are the bed legs.

Secure the legs to the frame with six evenly spaced 3-inch lag bolts through the inside of the frame into the legs. This way, the outside of the legs are not marred with screw holes.

Turn the frame back upright, now standing on the legs. Position 22 planks of 1-by-3 lumber, the bed slats, across the frame. Both ends resting on the side slat supports and the middle resting on the central slat support. They should be spaced roughly a half-inch apart.

Secure the slats in place with 1 1/4-inch screws through each slat into all three support planks.