At our planter box factory, the maximum producible width for a single long balcony planter is 1200 millimeters (about 47 inches). This is not an arbitrary number—it is the result of careful engineering, material stress analysis, and practical installation constraints. For a planter that runs the length of a balcony, width refers to the front-to-back depth, not the overall length. While we can manufacture planters up to 6 meters long as one continuous piece, the width must stay within this 1200 mm limit to ensure structural integrity when filled with wet soil, which can weigh over 300 kilograms per cubic meter. Exceeding that width would require thicker aluminum walls, additional internal bracing, or a steel subframe, all of which add cost and reduce usable planting volume. However, we offer a custom solution: if your balcony design demands a deeper planter, we can produce two modules and install a weatherproof seam that aligns perfectly with a hidden drainage channel. This allows virtually unlimited total depth while keeping each unit within the factory’s optimal manufacturing envelope. Our CNC bending and robotic welding lines are calibrated for repeatable tolerances of ±1 mm at this width, ensuring that every long balcony planter fits flush against parapet walls or railing bases. For corner sections, custom angled widths are also available down to 200 mm, so even the narrowest Juliet balconies can be equipped with our lightweight composite planters. In short, 1200 mm is the hard cap for a single piece, but through engineered modularity, we can adapt to any balcony configuration without compromising durability or aesthetics. All final dimensions are verified through a digital twin simulation before production, and we provide anchoring brackets designed specifically for wind uplift in high-rise settings. Whether you are a landscape architect specifying a rooftop garden or a homeowner maximizing a narrow outdoor strip, our factory’s width limits are built around both safety and design freedom.