Should you patch the problem or replace the whole line? It is the biggest financial decision in sewer repair, and the wrong choice costs you money either way—spending too much on a replacement you did not need, or spending too little on a repair that fails within a year. This guide gives you a systematic framework to make the right call based on your pipe's condition, not a contractor's sales pitch.
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Start with the camera inspection results. If the problem is isolated to a single point—one cracked section, one root intrusion at a single joint, one area of damage from external force—a spot repair is usually the right answer. Spot repairs cost $1,500 to $4,000 and address the problem without disturbing the rest of the line.
If the camera reveals problems at multiple points but the pipe material is generally sound between those points, a partial replacement of the affected sections may be appropriate. This costs $4,000 to $8,000 and replaces the worst sections while leaving the functional sections in place.
If the camera shows widespread deterioration—generalized corrosion, multiple joint failures, extensive root intrusion throughout, Orangeburg material, or damage to more than 50 percent of the line—full replacement is the answer. Full replacement costs $8,000 to $20,000 but gives you a completely new system with a 50 to 100 year lifespan.
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Spot repair makes sense when: the rest of the pipe is in good condition on camera, the pipe material has significant remaining lifespan (PVC with minor damage, newer cast iron without generalized corrosion), and the damage was caused by an external event (construction damage, vehicle impact) rather than internal deterioration. Spot repair is a waste of money when: the pipe material is at or past its expected lifespan, the camera shows problems developing at other locations, or the repair requires disturbing a section that will need attention again within a few years.
CIPP lining creates a new pipe inside the existing one. It is ideal when the pipe alignment and grade are acceptable but the pipe walls are deteriorated. It cannot fix bellies, severe misalignment, or collapsed sections. Cost: $80 to $250 per linear foot. Pipe bursting feeds a new HDPE pipe through the old one, breaking the old pipe apart. It can upsize the pipe and correct minor alignment issues but requires access points at both ends. Cost: $60 to $200 per linear foot. Open trench excavation provides full access and allows grade correction, upsizing, and complete replacement. It is necessary when bellies need correction or when the old pipe route needs to change. Cost: $50 to $250 per linear foot plus restoration.
Consider the cumulative cost. If you spot-repair a 50-year-old cast iron line today for $3,000, and another section fails next year requiring another $3,000 repair, and a third section fails the year after that, you have spent $9,000 on a pipe that is still failing. A full replacement at $12,000 would have given you a completely new system from day one. The 50 percent rule provides a useful threshold: if the camera shows more than half the line is compromised, the total cost of serial repairs will almost certainly exceed the cost of a single replacement.
PVC under 40 years old: almost always repair. The material has decades of life remaining, and isolated damage is usually from external causes. Cast iron over 50 years old: lean toward replacement unless the camera shows the pipe is in excellent condition with minimal corrosion. Clay over 60 years old: replace unless joint integrity is good and root intrusion is confined to one or two locations. Orangeburg at any age: replace immediately and completely.
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Get the Free Checklist →If a contractor recommends a full replacement and the estimate exceeds $8,000, get a second opinion from an independent company with their own camera equipment. The second company should run their own camera inspection—not just review the first company's footage. If both companies arrive at the same conclusion independently, you can proceed with confidence. If they disagree, the discrepancy often reveals scope differences (one may be recommending more restoration than necessary) or legitimate differences in approach (trenchless vs. open trench) that give you negotiating leverage.
If a camera inspection reveals damage to more than 50 percent of the line, if the pipe material is Orangeburg, or if you have been repairing the same line repeatedly, full replacement is typically the better long-term investment.
For most situations, yes. Trenchless methods produce a new pipe with a 50-year or longer lifespan. The main limitation is that certain conditions like severe bellying or required grade changes may necessitate traditional excavation.
Yes, especially for estimates over $8,000. A second independent camera inspection and assessment ensures the recommendation is accurate and can reveal scope or approach differences that affect cost.
A properly installed PVC sewer line has an expected lifespan of 80 to 100 years. CIPP liners carry a 50-year warranty. Pipe-burst HDPE installations also last 50 years or more.
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