The cost to repipe an average-sized house can vary depending on several factors such as the size of the house, the type of pipes being replaced, and the location of the house. On average, repiping a house can cost anywhere from $3,500 to $10,000 or more. The cost may also depend on the type of materials used, with copper being more expensive than PEX or PVC. It's recommended to get a quote from a licensed plumber to get a more accurate estimate based on your specific needs.