- 1). Select construction grade or better pieces of pressure-treated lumber for your workbench. Cut the lumber with a circular saw so you have four two-by-fours measuring 26 3/4-inches long, four two-by-fours measuring 18-inches long, two two-by-sixes measuring 48-inches long and 12 one-by-twos measuring 54-inches long.
- 2). Construct the frame for your workbench. Attach two two-by-fours measuring 26 3/4 inches to the narrow edge of an 18-inch two-by-four with the 4-inch lag screws. Create pilot holes for the lags before screwing them in by cutting 3/8-inch dowels into the wood beams with a 1-inch spade and handsaw at the spots they intersect. Flip the resulting unit over so the unattached ends of the 26 3/4-inch two-by-fours are facing up. Screw another 18-inch two-by-four into the free ends, forming the left side of the workbench frame. Repeat this step to form the right side of the frame.
- 3). Screw a two-by-six to the center of each two-by-four on the left side of the frame. Connect the left side of the workbench frame to the right side by screwing the two-by-six into the center of the right-side two-by-fours with the 4 1/2-inch lag screws.
- 4). Create the top of your bench by laying flat 12 one-by-two pieces of lumber next to each other on top of your frame. Bore 3/8-inch holes into all of the one-by-twos 2 inches in from the left and right ends of each piece with a spade and handsaw. Insert threaded rods through the holes on each end and secure together with a washer and nut. Tighten the nut against the wood with a wrench.