Yes, urban outdoor furniture can often be left out during a renovation project, but I would not treat that as a default. It depends on the scope of the work, how long it will last, the weather, and how much dust, debris, paint, or heavy traffic the project will create. For a short, light refurbishment—say repainting a balcony rail or replacing a few pavers—well-made furniture can usually stay outside if it is moved away from the work zone, covered properly, and checked daily.
The bigger risks are not just rain. Renovation sites produce fine construction dust that settles into cushions, hinges, and woven surfaces; grit and debris scratch powder-coated frames and glass tops; paint or cement splash can be very difficult to remove. In dense urban areas, you also have foot traffic, tight access routes, and a higher chance of theft or accidental damage from workers carrying materials. If the project involves demolition, sanding, pressure washing, façade work, or months of construction, I would store the furniture indoors or off-site. That is usually cheaper than replacing damaged pieces.
If you decide to leave furniture out, start by talking to the contractor. Ask where the safe zone is and whether workers need access through the space. Move furniture as far from cutting, drilling, mixing, and painting as possible. Remove cushions, parasols, glass tops, and loose accessories and take them inside. Elevate frames off the ground on pallets or blocks so water can drain and legs do not sit in puddles. Use breathable covers rather than sealed plastic, which can trap moisture and cause mildew. Wrap sharp corners, stack lightweight chairs carefully, and secure everything against wind. For urban rooftop or courtyard furniture, weight down covers and check tie-downs, because wind tunnels can be brutal.
Insurance and building rules matter too. If furniture is in a shared courtyard, rooftop, or commercial frontage, check whether the building or project insurance covers it while work is underway. Some contractors will move items, but many will not accept liability for scratches or theft. Keep anything valuable—designer chairs, timber tables, outdoor sofas—out of the work zone. Take photos before the project starts, and do a quick inspection each evening if the site is active. After the renovation, clean frames and fabrics according to the manufacturer's instructions before putting cushions back out.
So my practical answer is: yes, urban outdoor furniture can stay outside during a renovation, but only with a clear protection plan. For short, low-dust jobs, covers, relocation within the site, and daily checks may be enough. For heavy or long projects, proper furniture storage is the safer choice. It protects your investment, keeps the site safer, and saves you from discovering a cracked tabletop or a dust-filled cushion when the scaffolding finally comes down.