Identify warning signs, understand repair options & estimate costs for Florida slab leaks
Post-Tension Slab · FL Water Chemistry · FBC 2020⚠️ Critical FL Note: Post-Tension Slabs
Over 80% of FL homes built after 1975 have post-tension (PT) concrete slabs with steel cable tendons under tension. Cutting or drilling a PT slab without GPR (Ground Penetrating Radar) scanning can sever a tendon — causing catastrophic slab failure and major structural repair costs ($15,000–$50,000+). Always require GPR scan before any slab penetration. Licensed FL contractors have GPR equipment or subcontract the scan.
Ground microphone or electronic listening equipment amplifies the sound of pressurized water escaping through a pinhole. Technician moves sensor along floor surface to triangulate the loudest point — indicating leak location below.
✅ Non-invasive. Works through tile, hardwood, carpet. Most common FL method.
⚠️ Background noise (traffic, HVAC) can interfere. Less accurate for very small leaks or multiple leaks.
Infrared camera detects temperature differences on floor surface. Hot water leaks show as warm plume on concrete — cold water leaks show as cool area from evaporative cooling. Best results in early morning before ambient temperature equalizes.
✅ Highly accurate for hot water leaks. Can see leak spread area. Fast — whole home in 30 minutes.
⚠️ Less effective for cold water leaks. Tile and thick flooring reduce sensitivity. Requires temperature differential (best in morning).
System is pressurized with helium/nitrogen mix. Helium escapes through leak and rises through concrete. Electronic helium detector (mass spectrometer sniffer) at surface detects helium concentration — peaks directly over leak.
✅ Most precise location method — can pinpoint within 2-6 inches. Works on cold AND hot water lines. Effective through thick FL slabs.
⚠️ More expensive ($400–$800 for detection alone). Requires specialized equipment. Takes longer than acoustic.
Isolate hot and cold sides of system separately using isolation valves or temporary plugs. Pressurize each side with nitrogen and observe pressure drop rate. Identifies which side (hot/cold) is leaking and estimates leak size. Used to confirm leak presence before invasive detection.
✅ Confirms leak presence definitively. Identifies hot vs cold side. Inexpensive first step.
⚠️ Locates which system leaks but not WHERE under slab. Requires follow-up locating method.
Radar waves penetrate concrete and return signals from embedded objects — post-tension cables, rebar, conduit, and pipe locations. Essential safety scan before any slab core drill or saw cut. Produces 2D/3D map of slab interior.
✅ Finds PT cable locations to prevent catastrophic severing. Maps pipe routes. Safety-critical for FL PT slabs.
⚠️ Does not directly detect leaks — used for safe access planning after leak is located. GPR scan cost: $200–$500.
Answer questions about your situation to get a FL cost range estimate. Actual quotes will vary — use this as a planning guide.
| Service | Low | Typical | High |
|---|---|---|---|
| Leak Detection (acoustic) | $150 | $300 | $500 |
| Leak Detection (helium) | $400 | $600 | $900 |
| GPR Slab Scan | $200 | $350 | $600 |
| Spot Repair (no tile) | $1,200 | $2,000 | $3,000 |
| Spot Repair (w/ tile) | $1,800 | $3,000 | $5,000 |
| Reroute (single line) | $1,500 | $2,800 | $5,000 |
| Epoxy Lining | $3,000 | $5,500 | $9,000 |
| Repipe <1,200 sq ft | $5,500 | $8,000 | $12,000 |
| Repipe 1,200–2,000 sq ft | $7,000 | $10,000 | $14,000 |
| Repipe 2,000–3,000 sq ft | $10,000 | $14,000 | $18,000 |
| Water Extraction / Dry-out | $800 | $2,000 | $5,000 |
| Mold Remediation | $1,500 | $4,000 | $12,000+ |
Costs vary by FL county — South FL (Miami-Dade, Broward, Palm Beach) typically 20-35% above Central/North FL rates. Emergency/after-hours premium: 25-75% above standard rate.
Don't wait — active slab leaks cause rapid mold growth and structural damage in FL's humidity. Our licensed FL plumbers respond fast.
Built for Florida homes - accounting for Florida's hard water, humidity, coastal corrosion, private well water, and county permitting.
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On this page, Florida slab leak estimates run about $15,000-$50,000, depending on home size, materials, and project scope. Use the calculator above for a Florida-specific estimate.
Pricing depends on the size and layout of your home, the pipe materials and fixtures you choose, your Florida region and local labor rates, and permit fees. Work that is more complex or harder to access generally costs more.
In Florida, minor maintenance may be DIY, but anything beyond that generally calls for a licensed plumber, and many jobs require a permit and inspection. When a permit, gas work, or your main water or drain lines are involved, hire a Florida-licensed plumber.
It depends on the cause and your specific policy. Sudden, accidental damage is more often covered than gradual wear-and-tear or maintenance - confirm the details with your insurer.
Timelines depend on scope - many routine jobs take a few hours to a day, while larger projects run longer. Your licensed plumber can confirm after assessing your home.
Planning estimate, not a quote — confirm with a licensed Florida plumber. Confidence is qualitative: ranges reflect this page’s Florida assumptions, not a guaranteed price.
Estimates on this page are Florida-specific and reflect Slab Leak for typical Florida homes.
From this page: On this page, Florida slab leak estimates run about $15,000-$50,000, depending on home size, materials, and project scope. Use the calculator above for a Florida-specific estimate.
Your actual cost depends on your home's condition, layout, and local labor and permit rates.
From this page: Pricing depends on the size and layout of your home, the pipe materials and fixtures you choose, your Florida region and local labor rates, and permit fees. Work that is more complex or harder to access generally costs more.
Generally raises cost: harder access, older homes, added permits and inspections, premium fixtures or materials, and emergency or after-hours work.
Generally lowers cost: easy access, bundling several items in one visit, standard fixtures, and off-peak scheduling.
Curated Florida tools and resources related to this page.
Last reviewed: July 1, 2026 (US Eastern)
Reviewed by the FL Plumbing Tools editorial team.
Sources: Florida plumbing cost research and Florida Building Code / local authority-having-jurisdiction (AHJ) permit references.
Florida reference: Estimates and guidance reflect Florida labor rates, permitting, hard water, humidity, and coastal conditions.
Updates: Reviewed periodically and updated as Florida codes, permit fees, and market rates change.