Absolutely, yes. As a professional planter box factory with years of precision manufacturing experience, we can produce a rectangular planter that is exactly 48 inches long for your window box. In fact, custom length is one of our most requested specifications—whether it’s a 48-inch window box for a modern apartment balcony or a unique size for a garden renovation.
First, let’s clarify how we ensure exact measurements. Unlike off-the-shelf options that come in fixed lengths like 36 or 48 inches (which may actually be a few millimeters off), our factory uses digital cutting and molding equipment calibrated to the millimeter. When you place an order for a 48-inch long planter, we program the tooling to cut your chosen material—such as fiberglass, resin, or metal—to precisely 48 inches. This means no gaps, no wobbling, and a seamless fit for your window sill or mounting bracket.
Second, material selection matters. For a window box that is exactly 48 inches long and needs to support soil and plants outdoors, we recommend fiberglass. It is lightweight—about 60% lighter than concrete—yet strong enough to handle up to 150 pounds of wet soil for a 48-inch box. Our fiberglass planters can also be UV-protected and color-matched to your home exterior, with drainage holes positioned exactly where you need them.
Third, the production process. You can start by contacting our sales team with your requirement: “I need a 48-inch long rectangular planter for my window box.” We’ll ask for details like depth (typically 8–12 inches for window boxes), width (6–10 inches), and whether you want an internal liner or mounting brackets. Then, we produce a prototype drawing via CAD software and confirm with you before cutting any material. Average lead time for a custom 48-inch planter is 10–14 business days, plus shipping.
Finally, quality assurance. Every custom planter undergoes a water-seal test and dimension check. We measure the length at three points (center and both ends) to guarantee it is exactly 48 inches, with a tolerance of ±1 millimeter. So if you’re asking, “Can you make a 48-inch long rectangular planter for my window box?” the answer is a confident yes, and we can also provide free samples or 3D renderings to help you visualize it.
