Ok so i have recently bought a house and to keep cost down i have decided to tackle the back yard alone. The garden is level for about 3/4 meters then rises to the back fence for another 3/4 meters. I want to make as much of the garden level as possible. I am in the planning stages and would like some suggests if anyone has done anything this in the past. Would it be advisable to install a wooden retaining wall instead of block and stone to keep cost down? Do you have to use a concrete base? The length of the retaining wall will be 9 meters.