When you're shopping for an outdoor bench, aluminum and steel are the two most common metal choices. The short answer: a basic steel bench is usually cheaper upfront, while aluminum tends to sit in the mid-to-premium range. But the real price difference depends on the type of steel, the finish, and how long you plan to keep the bench.
Typical price ranges I've seen for 2025 retail sit around: basic powder-coated steel benches from $90 to $250, decorative cast aluminum benches from $150 to $450, extruded aluminum benches from $250 to $700, and commercial-grade or stainless steel benches from $300 to $800 or more. These ranges overlap, so a cheap aluminum bench can cost less than a heavy-duty stainless steel bench. However, if you compare similar styles at most big-box retailers, steel is usually the budget option.
Aluminum often costs more because it is lightweight, naturally rust-resistant, and requires more detailed casting or extrusion work. The raw material cost per pound is generally higher than carbon steel. That said, a quality aluminum bench can easily last 10 to 20 years with almost no maintenance, which makes the long-term cost lower.
Steel can be cheaper because it is widely available and easy to mass-produce. Mild steel with a powder-coated finish keeps the price low and offers strong structural support. The catch is that if the coating gets scratched, moisture can reach the steel and cause rust. In coastal or humid areas, that can shorten the bench's life unless you repaint or touch it up regularly. An inexpensive steel bench might last 3 to 7 years if the finish stays intact.
So which one should you buy? If you need a budget-friendly bench for a covered porch, a good powder-coated steel bench is hard to beat. If the bench will sit uncovered in rain, sun, or coastal air, I would choose aluminum even if it costs $50 to $150 more upfront. That extra money buys less rust risk and much less maintenance over time.