Slab leak repair or repipe in Torrance

Once a supply line beneath a concrete floor starts to leak, you can mend that one spot or stop depending on the buried pipe altogether. A single spot repair costs less today, yet a house with leaks in several places on its slab piping is often better off with an overhead reroute or a complete repipe. Through our service a local plumber visits, tracks down the leak and price each route on paper. It forms part of our broader leak and burst pipe help.

How do I know I have a slab leak?

Clues include a bill that keeps climbing though habits have not changed, a faint trickling noise in a silent house, warm spots on the floor, damp carpet edges or baseboards, cracked grout, and a meter that never settles. A hot water tank that seems to fire constantly, or weak pressure, adds weight.

The cheapest test is free. Close every tap and stop every appliance, then look at the meter's small leak-indicator dial or triangle. If it creeps, water is getting out somewhere. EPA puts the typical home's yearly loss above 9,300 gallons, and a concealed slab leak can outlast a dripping faucet by months before anyone notices. A floor that is warm to bare feet strongly suggests a hot-line leak. Before blaming the slab, look at why a water bill suddenly rises.

What makes buried pipes in South Bay slabs fail?

Pipes under concrete leak because of age, corrosion, abrasion against gravel or concrete, hard water, high pressure, and ground movement. Some postwar South Bay homes were built on slabs with supply lines laid beneath the floor, and in older copper systems pinhole corrosion is a known failure.

Chemistry matters. Cal Water's 2025 report for Hermosa-Redondo lists local groundwater near 502 ppm total hardness, and other suppliers publish different numbers, so read the report that arrives with your bill. High pressure accelerates wear, so a plumber often tests it on the visit. Also, not every house here sits on a slab: hillside homes and older beach cottages often have raised floors over a crawl space, where pipes are easy to reach. The plumber will confirm what you have.

How do plumbers pinpoint a leak beneath concrete?

The plumber isolates the line, pressure-tests it in sections and listens or scans with electronic gear before cutting a thing. Precise location separates a modest repair from a ruined floor. Detection is usually a small fraction of the whole job.

Fixr prices detection at $100 to $400. Tools include acoustic listening devices, thermal cameras for hot lines and tracer gas. Good diagnosis also reveals the number of leaks and the state of nearby pipe, which steers the choice between patching and repiping. Ask to see the reading, and have the spot marked on the floor before any breaking begins.

What are my repair options for a slab leak?

Four routes exist: open the slab above the leak, tunnel beneath the house, coat the pipe's inside with epoxy, or give up on the buried line and feed a new one through the walls or roof space. Cost, noise, dust and disruption differ for each, so ask how each would treat your flooring.

• Opening the slab. The plumber saws the concrete above the leak, fixes the pipe and patches the floor. Fixr gives $500 to $3,000 for opening the slab.
• Tunneling. Digging under the foundation to reach the pipe avoids floor damage, at about $900 to $2,000 on the same guide.
• Epoxy or pipe lining. A resin coating inside the pipe seals small leaks. Fixr lists trenchless lining at $500 to $2,000, priced by linear foot, and not every pipe suits it.
• Reroute or repipe. New lines run overhead or inside walls, and the old line is capped. Fixr gives $4,000 to $15,000.

These ranges are a guide from one published source, read in November 2026. The price of your job depends on pipe location, floor finishes and access. For detailed money breakdowns, slab leak repair cost goes further.

Should I repair the slab leak or repipe the house?

Patching or lining suits one recent leak in otherwise healthy pipe. Repipe when there have been several leaks, old copper is pinholing, the water is corrosive, or you are facing a second breakout of the slab. For a slab house the cleanest repipe leaves the concrete alone and routes new lines through walls and attic.

Think of it as cost per future leak. A $1,500 patch that is followed by another leak in 18 months, and another breakout, costs more than one planned repipe. Bob Vila's guide gives a national $630 to $4,400 for slab leak repair itself, while Fixr shows $4,000 to $15,000 for rerouting. A reroute often needs drywall patching and paint afterward, so ask whether that is in the quote. PEX is the usual material for new runs; see PEX versus copper and repiping a house for how a whole-house job runs, and what a repipe costs.

Could a concrete roof slab be the leak source instead?

A leaking concrete roof slab is a waterproofing problem rather than a supply pipe problem, and it is common on flat-roofed and multi-story buildings. The leak is usually through the membrane, a drain, a penetration or a crack, so the fix is a roofer or waterproofing specialist, sometimes alongside a plumber for the drains.

Stains arriving in the middle of a storm, or right after one, point at the roof. Stains that show up in dry weather point at plumbing. A plumber can pressure-test supply and drain lines to clear them, after which a roofer or waterproofing specialist takes over. In a condo or townhouse, confirm who owns the roof before paying for anything.

Will insurance help with a slab leak, and is a permit needed?

Partly, at best. The California Department of Insurance describes homeowners policies as typically paying for sudden, accidental water damage while excluding seepage, wear and tear, and maintenance problems, and Fixr notes slab leaks are usually uncovered. Read your own policy, and ring your insurer ahead of any work.

Your policy may still pay for ruined flooring and walls even when the pipe is excluded, and some pay access costs. Keep photos, the leak report and the invoice. Repipes and most pipe replacement need a permit: Torrance handles plumbing permits through Building and Safety as a separate trade permit, and the plumber normally files. More on coverage: insurance and burst pipes and broken pipes under a foundation.

How should I pick a slab leak contractor?

Confirm the license through the state board at cslb.ca.gov, get quotes in writing that name the method, the finish repairs included and the permit, and compare two at least. Find out whether detection is billed separately and how floors will be protected. Our notes on slab leak companies list points to compare.

Begin with the quote form, or see what else we do via the home page, whenever suits.

Common questions

What should slab leak work cost?

Fixr's typical band is $1,000 to $4,000, averaging near $2,500 nationally, from a floor of $600 to a ceiling of $15,000. Rerouting or repiping starts at $4,000 and climbs to $15,000. Consider these ballpark; the quote you receive reflects your floors, access and the number of leaks.

Is it possible to repair a slab leak and leave the concrete intact?

Sometimes. Tunneling under the foundation avoids floor damage, epoxy lining seals small leaks from the inside, and rerouting new lines through the walls leaves the slab untouched. Which works depends on the pipe's condition and location, and the plumber should say which are possible before quoting.

How many days does slab leak work take?

A single spot repair may need a day or two with drying and patching; a whole-house reroute commonly runs several days plus drywall finishing, and lining or tunneling lands in the middle. Ask for dates in the quote, and expect interruptions to your water supply during working hours.

How urgent is a slab leak?

Act quickly. Water pooling or soaking the floors means closing the main and booking a plumber that same day. A slow seep can wait for a booked appointment, yet it can undermine soil, wreck flooring and inflate bills, so do not let it run for weeks.

Must the whole house be repiped after a slab leak?

Not necessarily. A lone leak in otherwise healthy pipe can simply be mended. Repeated leaks, widespread pinholes, corrosion or weak pressure are what tip the balance toward a repipe. After inspecting your lines, the plumber can advise, and you may request both prices side by side.