Yes, but I would not treat a houseboat deck like a backyard patio. Urban outdoor furniture can sometimes work on a boat or houseboat in an urban marina, especially if the piece was designed for exposed public spaces, but a marina is still a tougher environment than most people expect. Even in a sheltered city marina, you are dealing with moisture, rain, wind, sun, temperature changes, movement, and sometimes salt air if the marina is near the coast. That combination is hard on ordinary patio furniture.
The biggest issue is material. Marine-grade stainless steel, anodized aluminum, teak, marine-grade HDPE, and rust-resistant hardware are much safer choices. I would avoid cast iron, mild steel, particleboard, MDF, untreated wood, and anything with tiny metal parts that can rust quickly. Powder-coated furniture can work if the coating is intact and the frame is prepared for damp conditions, but once it gets scratched, rust can start. Glass tops are also risky on a moving boat, and lightweight chairs need to be secured before they blow over.
Weight and stability matter too. A heavy urban bench might feel solid on land, but on a smaller houseboat or boat deck it can affect balance and make the space harder to use safely. Low, stable pieces with non-marking feet, locking mechanisms, and tie-down points are better. Do not bolt furniture through a deck without sealing the holes properly, and check the boat’s weight limits and center of gravity before adding anything large. Cushions should be quick-drying, mildew-resistant, and UV-resistant, or removable and stored inside when not in use.
You also need to think about marina rules and safety. Furniture should not block walkways, mooring lines, life-saving equipment, or engine access. Some marinas have fire regulations and restrictions on loose items, grills, and storage on decks. If the piece is going on a covered houseboat deck, it may last longer, but ventilation and drainage still matter. I would choose furniture with good drainage, avoid flat surfaces where water pools, and rinse and dry it regularly.
So, can urban outdoor furniture be used on a boat or houseboat in an urban marina? Yes, but only selectively. Choose marine-friendly materials, secure every piece, keep the layout safe and lightweight, and be ready to maintain it more often than you would at home. A piece that looks perfect in a city park may not survive a marina season, but the right urban outdoor furniture can be a practical and comfortable addition to a houseboat deck if you plan around moisture, motion, and safety.