Full feature article · Landscape Design
Retaining Wall and Terraced Garden Design Ideas and Photos
How to turn a sloping block into usable garden rooms — wall types, drainage, step proportions, planting and the levels that make terraces work.

A sloping block is not a problem, it is an opportunity most flat gardens never get: distinct outdoor rooms at different heights, long views across the garden, and a natural excuse for water to move. What ruins sloping gardens is treating the slope as a single continuous fall. Terracing it into two or three level platforms, each with a purpose, transforms an unusable hill into the most interesting garden on the street.
Choose the wall type for the height and the look. Sleeper walls in hardwood or steel and timber suit low terraces up to around a metre and cost the least. Concrete block walls with a rendered or stone clad face handle greater heights and look permanent. Dry stone and gabion walls plant beautifully and drain themselves. Anything over about a metre, or supporting a driveway or structure, needs engineering and usually council approval — treat that as a given rather than a surprise.
Drainage is the reason walls fail. Every retaining wall needs free draining gravel behind it, a subsoil drain at the base wrapped in geotextile, an outlet that actually goes somewhere, and weep holes or a permeable face. Water trapped behind a wall exerts enormous pressure, and no amount of steel compensates for a blocked drain. Build the drainage before the facing material, because it is the part you can never fix later without demolition.

Then make the levels pleasant to use. Steps in generous flights with consistent risers around 150 millimetres and treads at least 350 deep, landings where the flight changes direction, and a handrail or wall at the edge of any drop. Plant to soften the wall faces with trailing groundcovers and grasses, light the underside of each tread so the terraces read as layers after dark, and give every platform a reason to exist — a table, a lawn, a pool, a productive bed.




