There are three main ways to fix a slab leak. A spot repair opens the concrete at the marked leak and fixes that section. A reroute abandons the leaking line and runs a new one through the walls or attic. A repipe replaces most or all of the supply lines. The right choice depends on the pipe's age and condition, how many leaks there have been, and where the leak is.
Once a slab leak is found, the next question is how to fix it. There are three main approaches, and each one fits a different situation. This guide explains them so you can have an informed conversation with your plumber.
First things first: every option starts with knowing exactly where the leak is. See how to find a slab leak and our slab leak detection service.
Option 1: Spot repair
What it is: the concrete is opened at the marked leak, the damaged section of pipe is repaired or replaced, and the slab and flooring are patched.
Best when:
- there’s a single leak,
- the rest of the pipe is in good condition, and
- the leak location is accurately marked.
Keep in mind: flooring above the leak has to be removed and replaced, which matters more with tile or hardwood. Accurate detection keeps the opening small.
Option 2: Reroute
What it is: the leaking line is abandoned under the slab, and a new line is run through the walls, ceiling or attic to reconnect the fixtures it served.
Best when:
- the leak is under an area that’s hard or costly to open, like a finished kitchen or large tile floor,
- the line has leaked before, or
- you’d rather not break the slab at all.
Keep in mind: it means some drywall work, and the new route has to be planned around the home’s layout.
Option 3: Repipe
What it is: most or all of the home’s water supply lines are replaced, usually rerouted overhead rather than under the slab.
Best when:
- the pipes are old or have had several leaks,
- there are signs of widespread wear, or
- you want to stop repairing one leak at a time.
Keep in mind: it’s the largest job of the three, with more wall openings, but it addresses the whole system rather than one spot.
Quick comparison
| Spot repair | Reroute | Repipe | |
|---|---|---|---|
| Opens the slab | Yes, at one marked spot | No | Usually no |
| Opens walls or ceilings | No | Some | More |
| Fixes | The one leak | The leaking line | The whole supply system |
| Fits best | One leak, sound pipe | Hard-to-reach leak, repeat leaks on one line | Aging pipe, multiple leaks |
What decides the right option
- Pipe age and material — older copper lines with pinholes are more likely to leak again
- Leak history — first leak or the third?
- Leak location — under a finished kitchen, a bathroom or an open area
- Hot or cold side — hot lines see more expansion and wear
- Flooring above the leak — tile and hardwood are costlier to open and replace
- How long you plan to stay in the home
Where leak detection fits
Detection and repair are separate steps. We find and mark the leak and give you photos and readings; your plumber uses them to recommend and carry out the repair. The more accurate the location, the smaller a spot repair can be — and the clearer the choice between repair options becomes.
For how repairs are priced, see what affects leak detection cost. For insurance questions, see does homeowners insurance cover slab leaks.
Need the repair done too? See our pipe repair service.
Need the leak found first?
We locate slab leaks across Bargersville and Johnson County without breaking the floor to search. Call to describe what you’re noticing.
Still can’t find it?
Our slab leak detection pinpoints the leak without tearing things up, so the repair starts in the right spot.
Frequently asked questions
What is the best way to fix a slab leak?
It depends on the pipe. For a single leak in otherwise sound pipe, a spot repair at the marked location is often simplest. If the pipe is aging or leaks keep coming back, rerouting or repiping can be the better long-term fix.
Do they have to break the floor to fix a slab leak?
For a spot repair, yes, but only at the marked leak — usually a small opening. A reroute avoids breaking the slab by running a new line through the walls or attic instead.
How is the leak location found before the repair?
With professional slab leak detection: the lines are isolated and pressure-tested, then acoustic listening, thermal imaging or tracer gas pinpoint the spot so it can be marked on the floor.
Can a slab leak come back after a repair?
A repaired section can hold for years, but other parts of an aging line can develop new leaks. That's why the pipe's overall condition matters when choosing the repair.