Yes—there are urban planter boxes designed to be tall enough to work as a privacy screen on a terrace. The key is to think in terms of total screen height, not just the height of the box itself. For real privacy, you generally want the planter plus plants or a trellis to reach about 1.4–1.8 metres above the terrace floor for standing privacy, or around 1.1–1.4 metres if you mainly need privacy while seated. Many good options use a planter body around 60–100 cm high and add a built-in trellis, tall grasses, bamboo, or climbing plants to reach the right level.
Look for products described as tall privacy planters, terrace screen planters, planter boxes with trellis, modular planter walls, or deep trough planters. Rectangular trough planters are especially practical on terraces because they create a continuous visual barrier without taking up too much depth. If your terrace is windy or exposed, choose a heavy, stable planter or one that can be anchored. Lightweight materials such as powder-coated aluminium, HDPE, GRP, or fibreglass are easier to move, while fibrestone, concrete, and steel feel more substantial but can be much heavier.
For planting, choose species that suit the exposure and your maintenance level. Climbing plants on a trellis are excellent for softening a screen, while bamboo—kept in a contained planter—tall ornamental grasses, and evergreen shrubs can provide year-round structure. Make sure the planter has good drainage, use a saucer or waterproof liner to protect the terrace surface, and check balcony load limits before filling a large box with soil. Also confirm any building, rental, or homeowners’ association rules about screens and wind safety.
So the short answer is yes: a tall urban planter box can absolutely double as a terrace privacy screen if you choose the right total height, a stable design, and suitable plants. Measure from the terrace floor to your desired privacy level, then select a planter-and-trellis combination that reaches it comfortably without blocking too much light or airflow.