Updated October 2026 | Plumbing |
Slab leak repair cost depends on which fix the pipe needs. Published cost guides put a spot repair through the slab at $500 to $4,000 and a whole house repipe at $1,500 to $15,000. Rerouting ranges differ by source. This Old House lists $1,500 to $15,000 and HomeGuide lists $3,900 to $7,500. Leak detection runs $150 to $600 when a plumber prices it as its own line.
Angi puts the national average at $2,280, with most jobs between $630 and $4,400. That average includes leak detection. Los Angeles jobs tend to land in the upper half of each range. Labor rates run higher here, reroutes and repipes generally need a plumbing permit, and many estimates list floor restoration as a separate line. This page covers what each repair costs, how a plumber finds the leak, what insurance usually pays for, and the warning signs worth acting on.
Slab Leak Repair Cost by Repair Method
These ranges come from national cost guides and homeowner-reported prices. Angi’s $2,280 national average includes leak detection. Other estimates may itemize detection, access, concrete patching and finish restoration differently. Ask what is included before comparing totals.
| Repair method | Published cost range | Where it fits | What pushes it higher |
|---|---|---|---|
| Leak detection | $150 to $600 | Every slab leak. The repair is priced after the leak is located. | Large homes, more than one suspect line, after-hours calls. |
| Spot repair through the slab | $500 to $4,000 | One leak on a line in good condition, under flooring the crew reaches easily. | Tile or hardwood above the leak. A leak under cabinets or a tub. |
| Rerouting plumbing | This Old House: $1,500 to $15,000 HomeGuide: $3,900 to $7,500 | A leak under finished flooring, or a line with a past repair. | Number of lines rerouted, length of each run, attic and wall access, two-story homes, drywall and paint. |
| Whole house repipe | $1,500 to $15,000, with most near $7,500 | Repeat leaks, or corroded pipe throughout the house. | Number of bathrooms, copper over PEX, stories, patching. |
National numbers run low for this market. California homeowners on CostHelper report paying $1,900 for a single spot repair and $4,000 to $7,500 for reroutes. Treat the low end of each range as a best case, not a quote.
Spot Repair Cost for a Slab Leak
A spot repair is the smallest fix. The crew opens the slab over the leak, cuts out the failed section of pipe, and installs new pipe. Fixr prices breaking through the slab at $500 to $3,000. CostHelper lists a minimum of $500 to $800 and says harder jobs reach $1,000 to $4,000 or more.
The location of the leak sets the price. A leak under a bare garage or closet floor sits near the low end. A leak under tile, hardwood, kitchen cabinets, or a tub sits near the top, and the flooring repair costs extra. Angi puts an easy-access repair near $630 and a hard-to-reach one near $4,400.
A spot repair makes sense for a first leak on pipe in good shape. On a line with pitting or a previous patch, another leak on the same run is likely. A second slab opening usually costs more than rerouting the line once.
Slab Leak Reroute Cost
A reroute takes the leaking line out of service. The plumber caps the pipe where it enters and leaves the slab, then runs a new line through the walls, ceiling, or attic. The concrete stays closed.
Published ranges vary widely here. This Old House lists $1,500 to $15,000 for rerouting plumbing. HomeGuide lists $3,900 to $7,500. The gap comes down to scope. One hot water line to a bathroom sits at the low end. Moving every line out of the slab sits at the top.
The price drivers on a reroute are the length of the run, the number of walls opened, attic access, and whether the home has one story or two. Drywall patching and paint add to the total. Reroutes and repipes generally need a plumbing permit in the City of Los Angeles. Ask your plumber to confirm the permit route for your project. The LADBS Express Permits bulletin lists non-engineered domestic water systems among the work eligible for an express permit.
A reroute fits best when the leak sits under finished flooring you want to keep, or when the line has leaked before. Our slab leak repair in Los Angeles page explains how each option gets matched to the leak.
Repipe Cost for a Home With Slab Leaks
A repipe replaces the water supply lines for the whole house and abandons the pipe under the slab. Angi says most homeowners pay around $7,500, with a range of $1,500 to $15,000. Copper costs more than PEX. Angi prices PEX pipe at $0.40 to $2 per linear foot and copper at $2 to $8.
A repipe costs the most up front. In a house with failing pipe, one repipe usually costs less than a string of separate slab repairs. Two slab leaks within a few years, pinhole leaks elsewhere in the house, or discolored water all point to pipe near the end of its life. Slab foundations are common in San Fernando Valley homes built from the 1950s on, and many still have the original copper lines under the concrete.
Our whole house repiping page covers PEX versus copper, timelines, permits, and Los Angeles pricing in detail.
How Plumbers Find a Slab Leak and What Detection Costs
Detection comes first, and the repair gets priced after the leak is pinpointed. Angi puts leak detection at $150 to $400, with an average of $280. This Old House lists $150 to $600 for slab leak detection. Larger homes and leaks on more than one line cost more to locate.
Plumbers combine several methods to locate a leak without opening the floor.
- Meter and isolation testing. The plumber shuts off sections of the system and watches the meter. This confirms a pressurized line is leaking and narrows down which one.
- Pressure testing. A section of pipe is isolated and monitored for pressure loss.
- Acoustic listening. Sensitive listening equipment picks up the sound of water escaping a pressurized pipe under the concrete.
- Thermal imaging. An infrared camera reads temperature differences on the floor. Hot water leaks show up as warm patches.
Accurate leak detection matters for cost. A pinpointed leak means one small opening in the slab. A guess means a larger hole, or a second one. Ask whether the detection fee is credited toward the repair, and get the answer in writing.
Costs Beyond the Pipe Repair
These are possible costs, not automatic additions to every range above. Some published totals already include part of this work, and some estimates leave it out.
| Cost item | Published range | When it applies |
|---|---|---|
| Concrete patch and floor restoration | $300 to $10,000 or more | Any repair through the slab. A bare utility closet sits near $300. Tile or hardwood runs far higher. |
| Drywall repair | $300 to $900 or more | Reroutes and repipes, where walls and ceilings are opened for the new lines. |
| Water damage repair | $500 to $15,000 or more | The leak soaked subfloor, drywall, or cabinets before it was found. |
| Mold remediation | $1,500 to $6,000 | A slow leak went unnoticed for a long stretch. |
| Plumbing permit | $50 to $500 | Reroutes and repipes. |
Ranges above come from Angi and HomeGuide. Ask for restoration to be spelled out in the estimate. Some plumbers patch the concrete and stop there. Flooring, drywall texture, and paint often go to a separate contractor.
What Homeowners Insurance Usually Covers on a Slab Leak
Coverage turns on the cause of the leak. The California Department of Insurance lists sudden and accidental water damage among the perils a homeowners policy typically covers. The same guide lists seepage or leaks, wear and tear, and earth movement among the perils generally not covered.
For a slab leak, most policies split the bill this way.
- Often covered. Water damage to floors, walls, cabinets, and belongings from a sudden pipe failure. Kin Insurance notes tearing out materials to reach the pipe is generally covered too when the pipe caused a covered loss.
- Usually not covered. The plumbing repair. Policygenius notes a policy generally will not pay to fix the broken pipe. The same applies to a reroute or repipe done to prevent the next leak.
- Usually denied. Leaks tied to corrosion, long-term seepage, or deferred maintenance. Earthquake and ground movement damage also falls outside a standard policy.
Report the leak to your insurer promptly, since a delay is a common reason for denial. Take photos and video before repairs start. Keep the leak detection report, the estimates, and the invoices. Keep the damaged section of pipe until the adjuster has seen it. Compare the covered amount to your deductible before filing a small claim.
Your policy language decides the outcome. Ask your agent how your policy treats access, tear-out, and hidden leaks before work starts.
Slab Leak Warning Signs
A slab leak rarely shows up as a puddle first. These signs usually come earlier.
- A water bill that climbs with no change in use
- A warm spot on the floor, a sign of a hot water line leak
- The sound of running water with every fixture off
- Damp carpet, warped wood flooring, or loose tile
- Lower water pressure across the house
- A water heater that runs more than usual
- A musty smell or mildew along the baseboards
- New cracks in floors or walls, or water pooling along the foundation
A meter test confirms a leak without any tools. The EPA method is simple. Turn off every fixture and appliance, write down the meter reading, and wait two hours without using water. A changed reading means water is leaving the system somewhere.
A hot floor, pooling water, or a fast-moving meter calls for action the same day. Shut off the main valve and schedule detection. The EPA estimates the average household’s leaks waste more than 9,300 gallons of water a year. A leak under a slab runs around the clock, and the water goes into the soil under the foundation.
Get a Price for Your Slab Leak
A cost guide gives you ranges. A real number takes locating the leak, then looking at the pipe, the flooring above the leak, and the route a new line would take. PowerRoute handles slab leak detection and repair across Los Angeles and the San Fernando Valley.
See how we find and fix slab leaks, then request a quote for your home.
Frequently Asked Questions
Published cost guides put a spot repair through the slab at $500 to $4,000 and a whole house repipe at $1,500 to $15,000. Rerouting ranges differ by source. This Old House lists $1,500 to $15,000 and HomeGuide lists $3,900 to $7,500. The number of lines and the access to them set where a reroute lands. Leak detection runs $150 to $600 when priced as its own line. Los Angeles jobs tend to land in the upper half of each range. Ask each plumber what the quote includes before comparing totals.
A spot repair through the slab usually costs less when the leak sits under bare concrete or a closet floor. A reroute often costs less overall when the leak sits under tile, hardwood, or cabinets, since the floor stays intact. A reroute also takes the whole run out from under the slab. A spot repair leaves the rest of the old pipe in place.
Angi lists $150 to $400 for leak detection, with an average of $280. This Old House lists $150 to $600 for slab leak detection. Ask whether the fee is credited toward the repair.
Policies typically cover sudden and accidental water damage, and many pay to open and restore the slab to reach the pipe on a covered loss. The pipe repair is usually excluded. Leaks from corrosion, wear, or long-term seepage are usually denied. Your policy language decides the outcome.
Yes. A reroute caps the leaking line and runs a new one through the walls or attic, and the concrete stays closed. A repipe does the same for every water line in the house.
A repipe makes sense after a second slab leak, or when the pipe shows corrosion or pinhole leaks in more than one place. One repipe usually costs less than several separate slab repairs plus the floor restoration each time.
Sources
- Angi, How Much Does Slab Leak Repair Cost
- Angi, How Much Does It Cost to Repipe a House
- This Old House, Slab Leak Repair Cost
- HomeGuide, Slab Leak Repair Cost
- Fixr, Slab Leak Repair Cost
- CostHelper, Slab Leak Cost
- Los Angeles Department of Building and Safety, Express Permits (No Plan Check Required)
- California Department of Insurance, Residential Property Insurance Guide
- Kin Insurance, Does Home Insurance Cover Slab Leaks
- Policygenius, Does Home Insurance Cover Broken Pipes Under Slab
- U.S. Environmental Protection Agency, WaterSense Fix a Leak Week
