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On average, expect to pay $2,400 to $6,400 for a 20-by-20-foot concrete patio. That price includes concrete materials, labor rates, sealing, and permits. With more complex designs and premium materials and finishes, the cost may be higher. Get quotes from multiple local patio contractors to get a precise estimate for your area.

Costs depend on order size, mix type, distance, and any additional services, such as pumping or special additives.

If you're only working with a gravel pad, and there is no concrete foundation, you might be able to upgrade to a concrete slab, but you’d have to speak with a professional concrete expert to confirm and get pricing. If you have a concrete foundation or cement block walls around the area where you want to build flooring, you might be able to pour a new concrete floor over the existing one to forgo repairs. Again, speak with a concrete expert or foundation company to see if this is an option.

It’s not unusual for a contractor to ask for 50% down before starting a project, as they may need to start hiring crew members and purchasing materials and equipment before they can start. However, they should never ask for more than 50% up front or request you pay in full before work has begun. To help protect yourself from losing money, have a written contract that outlines the project timeline and expectations. Only hire reputable contractors to work on your home, and be sure to check their licensing and insurance before hiring.