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French drain repairs generally include cleaning to remove clogs or replacing damaged pipes. Drain cleaning costs between $150 and $200 per hour. If replacement is necessary, the cost to install a French drain can run up to $5,000, depending on its type and location.

Trenchless sewer replacement costs between $60 and $250 per foot but is usually not an option for interior plumbing lines. Plumbers typically only use this approach for outside sewer pipes.

Unless you can see a clog through a drain or cracked pipe under a sink, you may be unable to identify its location. To find the problem, your plumber may test your water pressure at specific points or use a sewer camera.

Common signs that a drain pipe requires repair include slowly draining water, backups, regular clogs, strange gurgling sounds, or foul odors from the drain. Also, contact a plumber if you can see rust or oxidation on a drain pipe under the sink or in the basement.

The cost to repair a sink drain pipe can be as low as $100, covering the cost of a plumber’s labor for one to two hours. If the pipe needs to be replaced or is difficult to access, costs could climb up to $500.