How to Make Concrete Seats

Pick a design for the concrete seat. You can draw a model of what the seat should look like for a guide when later constructing the seat. Consider the shape and size you want the seat. The average seat size is about 2 feet tall with a 3-foot by 1-foot seating area.

Create a mold for the seat using particleboard coated in a melamine liquid to ensure the finish is smooth. Two sides of the box should be about 2 feet high and 1 foot wide. The other two sides should be 2 feet high and 3 feet wide. Nail the four sides together to construct a rectangular frame.

Clear off an area of soil large enough for the seat with a shovel. Dig a four-inch hole the size of your finished seat. Level the area off, removing any debris and roots. Use a gravel rake to smooth the soil out.

Place the created mold box around the cleared space. Use a level on all four sides of the mold to ensure it is sitting evenly inside the cleared-off area. Hammer two stakes into the ground on each side outside the mold. This will hold the mold in place when the concrete is poured.

Dump the concrete mix in a wheelbarrow and add water. Follow the manufacturer's instructions on your chosen concrete mix. Pour the concrete into the mold and use a trowel to smooth the surface. Place a plastic tarp over the poured concrete to keep any debris out.

Allow the concrete two to three days to completely set up and dry. Test the concrete to make sure it is dry after this time with a toothpick. Remove the stakes and the particleboard frame. Paint the bench if desired with an exterior concrete paint. Allow an additional 24 to 36 hours for drying.