On plots with a pronounced slope, any serious garden project starts by solving the retention of the ground, and this is a job that combines gardening with basic structural calculation, not just aesthetics.
Height of the drop: the factor that changes the quote most
A low retaining wall (up to 60-80 cm) can be solved with relatively simple solutions, such as concrete block or dry-stacked stone with a certain retaining batter. Above that height, structural calculation with proper reinforcement and foundations starts to be necessary, and on significant drops it may require a competent technician to step in before execution.
Drainage behind the wall: essential
Without a drainage system behind the wall (gravel, drain pipe, weep holes), the pressure of water accumulated from rain can end up pushing and cracking the wall over time. This drainage should always be quoted as part of the work, not as an optional extra.
Material according to garden style
Natural stone, exposed concrete block, gabions (stone-filled cages) or treated wood are the most usual options, each with a different price and maintenance that should be explained according to the overall style the client wants for the garden as a whole.
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