Notwood build beautiful Diy retaining walls adelaide that stand the test of time. We use and source the best possible products and suppliers. We have a range of DIY friendly products if you are choosing to build your garden or retaining wall yourself. A retaining wall is a structure designed to hold back soil or other materials from an area that is at a higher elevation. These walls are commonly used in landscaping to create terraced gardens, level sloping lawns, or provide support for driveways and walkways. Building a retaining wall is not a difficult task, but it does require careful planning and preparation. In this article, we will go over the steps involved in building a retaining wall.