Wood benches follow basic designs, making them relatively simple to build. A standard bench consists of a wide seat, two legs and support beams. You can customise the shapes of the wood to be more aesthetically pleasing. Paint or stain also improves the overall appearance of the bench.
Cut three planks to 4 feet long with a circular saw. These will be the seat support and sides of the bench. Cut two planks to 18 inches long for the legs.
Attach the legs to the underside of one of the 4-foot planks, using a nail gun. The 12-inch ends of the legs should meet the 12-inch edges of the 4-foot plank. The edge of the long plank needs to be flush with the exterior side of the legs. Drive four 2-inch nails through the top of the 4-foot plank into the upper edge of each of the legs.
Attach the two remaining 4-foot planks to the sides of the bench. The planks sit lengthwise on each side of the upper plank. The upper edges of the side planks must be flush with the top of the upper plank, making the overall width of the seat 14 inches. Drive four 2-inch nails through the exterior face of the side planks into the sides of the legs, spaced evenly. Nail nine 2-inch nails every six inches through the exterior face of the side planks into the edge of the upper plank.
Cut a piece of 1/2-inch plywood to 4 feet long and 14 inches wide.
Spread wood glue across the top of the bench. Place the plywood on top of the bench, flush with all four corners of the seat supports beneath, and secure with 1-inch brads using the nail gun. One brad in each corner and two along the lengths will be sufficient..
Sand and paint the bench as desired. Exterior benches should have a sealant applied before painting. For a more decorative finish, use a jigsaw to carve designs into the sides or legs.