Slab leaks
Slab leak repair in Phoenix
Three ways to deal with a leak under a concrete slab, and the trade-offs nobody mentions until the floor is already open.
The three options, side by side
Once the leak has been pinpointed — and it has to be pinpointed first, because everything below depends on knowing exactly where it is — these are the routes available. The table is the short version; the trade-offs are the part worth reading.
| Option | What gets opened | What it leaves you with |
|---|---|---|
| Spot repair through the slab | Flooring lifted in one place, concrete cut, soil and caliche dug out, pipe repaired, concrete and flooring replaced. | The smallest change to the house, and a line that is otherwise the same age in the same slab. |
| Reroute | Drywall opened where the new line rises and drops. The slab is not touched and the old run is abandoned in place. | Patching and paint instead of flooring, a new run that needs insulating in the attic, and one failed section permanently out of service. |
| Supply repipe | Openings at every drop through the house, done in one go. | The most disruption, once, and a supply system that is no longer in the concrete. |
When each one is the right answer
A spot repair suits a young system with a mechanical cause. A reroute suits a post-tension slab, a leak under cabinetry or under a floor that cannot be matched, and any case where cutting concrete raises more questions than it settles. A repipe is for a system that has failed more than once.
Why precision decides the option
Post-tension slabs
Plenty of Valley homes are built on post-tension slabs, where steel tendons run through the concrete under tension. Those slabs must not be cut without proper assessment first. That single fact often makes the decision on its own: if the concrete is not going to be cut, the answer is a reroute, and the job becomes a question of the cleanest path through the walls and attic.
Caliche under the concrete
Below the slab is the same cemented hardpan found across the Valley. It makes a cut-and-dig repair slower, and it spreads water sideways, so a damp patch in the hallway can be a long way from the failure. That is precisely why pinpointing comes first — opening concrete on an approximate location is how one hole becomes three.
Flooring you cannot replace
A discontinued tile, a stone or continuous wood floor, or a slab under kitchen cabinetry changes the arithmetic. None of it affects the pipe; all of it affects which option is sane, and it is a legitimate reason to leave the floor alone.
How age and material change the answer
Where a house sits in the Valley's building history tells us a great deal about what is under the slab and how it tends to fail. These are Census figures for the housing stock, not claims about your particular house, and the copy below is about what usually happens rather than what always does.
Homes from the 1970s and early 1980s
In Maryvale, 62 percent of homes were built before 1980, with a median of 1976; in Sun City the pre-1980 share reaches 88 percent. Copper of this era usually fails where it was bent or where it rubs a rebar chair, so the leak is rarely where the wet carpet is. A repair at the located point is entirely reasonable on the first failure. On the second, the pattern matters more than the patch.
Mid-century homes
Around Encanto and Willo the median home dates to 1961 and 75 percent of the stock is pre-1980. Early copper in Valley soil tends to fail at pinholes rather than joints, which is why a leak here can run for months at a rate the meter barely registers. That changes what a repair is even trying to achieve.
Homes from the 2000s build-out
In Buckeye, 89 percent of homes have gone up since 2000. Newer pipe rarely fails along its length - it fails at fittings and manifolds, which means locating it is about the connections, not the run. In a house like that, one leak is usually one fitting, not a verdict on the system, and a spot repair is very often the whole story.
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2023)
What you decide, and what we decide
We decide nothing about your floor. Our job is to give you the location, the options, and a straight account of what each one opens up and leaves behind. Yours is the call on disruption now against risk later, on which finishes are worth routing around, and on whether to deal with the rest of the system while a wall is open. If the claim matters, say so early — we photograph and document before a repair, not after. See slab leak detection for what happens before any of this, and documenting a claim for what a carrier usually wants.
Questions we get every week
Straight answers
Can a slab leak be fixed without opening the floor?
Usually, by rerouting. The failed section is left in the concrete and a new line is run through walls and overhead to the same fixtures. The slab stays intact. In exchange there is drywall to open and patch, and the new run has to be insulated and protected where it crosses the attic.
What if the house has a post-tension slab?
Then the concrete is not cut without proper assessment first, and in practice that pushes most jobs towards a reroute. It is also the clearest argument for pinpointing the leak properly rather than approximately, because the decision rests on knowing exactly what is where.
Should I repair this one or repipe the house?
If this is the first failure and the cause looks mechanical, repair it. If the same vintage of pipe has now failed in more than one place, each repair is buying time and the repipe conversation is the honest one. We will tell you which of those we think you have and why, and we are equally happy to do the smaller job.
Do I have to move out while the work happens?
We do not make promises about timing, so we will not answer that in general. What we do is tell you before we start which rooms are affected, what the water situation looks like while the work runs, and what state the house will be in at the end of each day.
Where we work
Across the Valley
Slab work across the older stock of the valley and the newer edges alike.
Related pages
Start here
Tell us what the floor is doing
A warm spot, a damp edge of carpet, a meter that will not settle — a photo and a sentence give us a real head start.
Already had it located?
Send the report or the marks on the floor and we will pick it up from there.
Send it in writing