How to Build a Cinder Block Footing for a Shed

Determine the dimensions of the shed from the manufacturer's plans. Measure off the indicated length and width of the shed at the site with a tape measure. Place a wooden stake in each corner.

Dig out a hole 2 or 3 inches deep with a shovel just inside each stake. Place a cinder block into the hole at each corner. Set the block on the ground with the holes pointing up.

Position a long 2-by-4 between two blocks. Check for level with a carpenter's level. Add or remove soil under the blocks as needed to obtain a level reading. Repeat for each side of the rectangle formed by the stakes.

Cut two 2-by-6 timbers to the longer length of the foundation rectangle. Place one of the timbers atop blocks on a long side of the layout. Repeat with the other timber and long side.

Drill a hole the same diameter as your rebar so that the rebar will go through the concrete hole and into the ground. A rebar with a diameter of 1/2 to 3/4 inch should suffice. Repeat for each corner block.

Drive the rebar through the hole and at least 2 feet into the ground with a hammer or mallet. Drill holes about every 4 feet between the corners and place rebar in the holes and hammer them into the ground. Ensure that the tops of all rebars are flush with the surface of the timbers.