How to make a set of retaining garden steps

The second step tread and top riser

7) Prepare the second step

Next do a repeat of 2). That is, dig back at least 200mm (8″) behind the top riser.

Dig, pack, and/or fill and tamp until the ground behind the riser is level and firm.

8) Make up the second tread

On an even surface make up the next tread by nailing three posts together (angle nail through one into another).

9) Fit the second tread 

Then place the tread on top of the riser and the level ground behind it.

Nail the tread to the riser. Angle the nails (toe nail) through the front face of the tread into the riser.

10) Make and fit the top riser 

Dig back at least 100mm (4″) behind the top tread. Dig, pack, and/or fill and tamp until that the ground is firm and level with the top of the tread.

Nail two 100mm x 100mm (4″ x 4″) posts together to make the final riser and then place it on top of the firm and level ground directly behind the tread.