Houston's Harris County clay soils expand and contract with the subtropical wet-dry cycles, stressing copper and galvanized lines under slabs in homes built before the 1990s in the Heights, Montrose and Midtown. When a pinhole leak develops, water migrates along the vapor barrier and can lift tile or warp hardwood in rooms above. Whole-house repipe crews isolate the affected branch, then pull new PEX or uponor tubing through strategic access points rather than breaking the entire slab.
Summer humidity above 80 percent combined with occasional winter freezes in Katy and Sugar Land accelerates corrosion on older fittings. Crews schedule repipes during the milder shoulder seasons to reduce moisture intrusion into open trenches. In River Oaks and Downtown high-rises with post-tension slabs, technicians map cable locations first and use sleeve pulls to avoid structural tendons while still achieving code-compliant slope and support spacing.
Access is gained through 12-by-12-inch floor cuts at fixture groups, not random jackhammering. Once new lines are pressure-tested to 150 psi for 24 hours, the trenches are backfilled with flowable fill and the original flooring is matched or replaced. Homeowners in Pearland often choose this route over repeated leak repairs because the soil movement that caused the first failure will simply repeat on adjacent pipes.
Final restoration includes moisture meters under the slab edge and a 48-hour recheck to confirm no residual dampness remains before cabinets or appliances are reset.
Technician insight
In Houston the thing that catches most people out with slab leak repipe is how quickly our clay soils move after a heavy rain. A leak that shows in the Heights in March can shift again by June if the new lines are not sleeved and supported every four feet, so we always run tracer wire and leave a map for the homeowner.
Montrose 1962 Slab Home
A persistent wet spot appeared under the dining room tile after spring rains. Detection found a pinhole on the galvanized hot line running beneath the post-tension cables. We pulled new PEX through two 12-inch cuts, pressure-tested, and restored the original tile. The homeowner reported no further moisture six weeks later.
Slab Leak Repipe Services We Offer
✓Slab Leak Detection
Electronic and acoustic listening locates active leaks under concrete without excavation in Montrose and Heights homes.
✓PEX Repipe Under Slab
Pulls flexible PEX tubing through minimal floor access points to replace corroded copper branches while preserving finished flooring.
✓Copper Line Replacement
Installs new type-L copper where code or homeowner preference requires rigid material in River Oaks and Downtown properties.
✓Slab Access and Restoration
Creates targeted floor openings, backfills with flowable fill, and matches tile or hardwood after line replacement.
✓Post-Tension Slab Coordination
Maps cable locations and uses sleeve pulls to protect structural tendons during repipe work in newer Midtown buildings.
Slab Leak Repipe Cost in Houston, TX
| Service | Typical Range | What Affects It |
|---|---|---|
| Slab Leak Assessment | $250–$450 | Includes electronic detection and access plan |
| Single Branch Repipe | $1,800–$3,200 | One bathroom or kitchen run in typical 1950s–1970s slab home |
| Whole-House Slab Repipe | $6,500–$11,000 | Varies by square footage and number of floor cuts required |
| Post-Tension Coordination | $800–$1,400 | Cable mapping and sleeve work in newer slabs |
Ranges are typical for Houston, TX and confirmed with an exact written quote before any work starts.
How it works
- 1
Site Assessment
Technician maps leak location with acoustic and moisture tools, reviews foundation type, and marks access points in the specific neighborhood.
- 2
Isolation And Shutoff
Water is isolated to the affected branch and temporary bypass lines are run to keep fixtures usable during the multi-day job.
- 3
Line Pull And Pressure Test
New PEX or copper is pulled through access cuts, supported per code, then tested at 150 psi for 24 hours before backfill.
- 4
Restoration And Verification
Trenches are filled, flooring restored, and moisture meters confirm dryness under the slab edge before final walkthrough.
Pricing
Cost depends on number of access points, flooring type, and whether post-tension cables are present.