Replacing pipes in an old house can be a significant home improvement project that varies widely in cost based on several factors. The average cost for replacing plumbing pipes typically ranges from $1,500 to $15,000, depending on the scope of the project, materials used, and labor costs.

Factors Affecting Cost:

• Type of Pipes: The choice of material can greatly influence the cost. Common materials include:
• PEX (Cross-Linked Polyethylene): Generally costs between $0.50 to $2.00 per linear foot. It is flexible, resistant to corrosion, and easy to install.
• CPVC (Chlorinated Polyvinyl Chloride): Costs around $0.50 to $1.50 per linear foot. It is also resistant to corrosion and is commonly used for hot and cold water supply lines.
• Cast Iron: This material is durable but heavy and can cost between $2.00 to $4.00 per linear foot. It is often used for drain, waste, and vent systems.
• Copper: Copper pipes range from $2.50 to $5.00 per linear foot. They are long-lasting and resistant to corrosion but are more expensive than other options.
• Scope of Work: The extent of the plumbing replacement will also impact the cost. A full home repiping can be significantly more expensive than replacing a few sections of pipe.
• Labor Costs: Labor costs can vary based on location and the complexity of the job. Generally, plumbers charge between $45 to $200 per hour, with some jobs taking several hours to complete.
• Accessibility: If the pipes are located in hard-to-reach areas, such as behind walls or under floors, the labor costs may increase due to the additional effort required.

Examples of Costs:

• For a single bathroom repipe using PEX, homeowners might expect to pay around $1,500 to $3,000.
• A whole-house repipe with PEX can range from $4,000 to $15,000, depending on the size of the house and the complexity of the plumbing system.
• Replacing old cast iron pipes with new PVC or ABS pipes in a two-bathroom house might cost between $3,000 and $7,000.

Additional Considerations:

• Permits: Depending on local regulations, permits might be required for plumbing work, which can add to the overall cost.
• Inspection: Hiring a plumbing inspector before and after the job can help ensure the work is done correctly, which may also incur extra costs.
• Water Quality: If water quality is a concern (e.g., lead pipes), replacing pipes is not just a cosmetic upgrade but a necessary health measure.

Overall, it is advisable for homeowners to obtain multiple quotes from licensed plumbers to get a better understanding of the costs involved for their specific situation. Additionally, consider consulting with a plumbing professional to assess the condition of existing pipes and recommend the best course of action.

For further reading, you might find resources from the HomeAdvisor helpful, as they provide detailed breakdowns of costs associated with plumbing projects.