The cost to replace cast iron pipes under a slab can vary depending on several factors, including the size of the project, the extent of the damage, the location, and the labor and material costs in your area. It's best to consult with a professional plumber or contractor who can assess your specific situation and provide an accurate estimate.
That being said, replacing cast iron pipes under a slab is generally a complex and labor-intensive process that involves breaking through the slab, removing the old pipes, and installing new ones. This can involve excavation, plumbing work, and potentially additional repairs to the slab or surrounding areas.
On average, the cost to replace cast iron pipes under a slab can range from several thousand dollars to tens of thousands of dollars. It's important to consider the cost of materials, labor, permits, any necessary repairs, and potential additional expenses that may arise during the process.
To get a more precise estimate for your specific situation, it is recommended to contact multiple reputable plumbers or contractors in your area and request quotes based on a thorough assessment of the project requirements. They will be able to provide a more accurate estimate based on your specific needs and the condition of your plumbing system.