If you’re choosing between plastic and metal for an urban bench and your top priority is low maintenance, here’s the direct answer: for most city locations, a powder-coated aluminum or galvanized steel bench is the better long-term choice. Plastic is not a bad material—it just comes with different trade-offs.
Plastic benches, especially the heavy recycled plastic type, require almost no routine care early on. They won’t rust, don’t need repainting, and can be cleaned with a hose or pressure washer. That sounds perfect, and in coastal areas or around pools it genuinely is. The catch is time. After a few years of sun exposure, plastic tends to fade, get a chalky surface, and can become brittle in cold weather or soften in extreme heat. Scratches and graffiti can be difficult to fix without leaving marks. When a plastic slat cracks, you usually have to replace the part or the whole bench. So plastic is low-maintenance in the short term, but it often looks worn sooner than good-quality metal.
Metal is trickier because “metal” can mean anything from bare steel to stainless steel. Bare steel or cheap painted steel will rust once the paint chips, so avoid that for low-maintenance urban use. Cast iron is tough but heavy and may need repainting over time. The real sweet spot is galvanized steel with a baked-on powder-coated finish, or powder-coated aluminum. The galvanized layer protects against rust even if the surface gets scratched, and the powder coating resists UV, weather, and most graffiti better than ordinary paint. Aluminum won’t rust at all and is lighter, though it can cost more. Stainless steel is extremely corrosion-resistant but expensive and tends to show scratches and fingerprints.
In practice, a good metal bench needs very little work: wash it occasionally, check bolts once or twice a year, and touch up any deep scratches that expose bare metal. That’s about it. Plastic needs even less attention at first, but you trade long-term appearance and structural life.
So which should you buy? If the bench is permanent or semi-permanent public furniture, go with metal—specifically powder-coated galvanized steel or powder-coated aluminum. If your budget is tight, the site is temporary, or you’re in a harsh salt-air environment, a heavy recycled plastic bench is a reasonable low-maintenance alternative. Just don’t buy the cheapest thin plastic or uncoated steel bench; those are not low-maintenance, they’re just cheap.