Slab leak repair costs a national average of $2,280 including leak detection according to Angi, with most homeowners paying $630 to $4,400.[1] Fixr publishes a $2,500 average within a $1,000 to $4,000 range, while HomeGuide prices the job by method: $500 to $3,500 for pipe lining, $700 to $5,000 for digging out and replacing the damaged pipe, and $5,400 to $10,800 for full slab replacement.[3][2] Detection alone runs $100 to $400 before any repair begins.[1][3]
A slab leak is not a wait-and-see problem, and it is not a DIY repair. Warning signs include foundation cracks, a sudden jump in your water bill, low water pressure, the sound of running water with fixtures off, and warm spots on the floor.[2][3] The EPA’s quick check: read your water meter, avoid using water for two hours, and read it again – any change probably means a leak somewhere in the home, not necessarily beneath the slab. And when damage is already evident, don’t wait on home tests before calling a plumber.[4] Angi is blunt about the work itself: this is strictly a job for a licensed plumber, because cutting into or tunneling beneath a foundation carries real risk of structural damage.[1]
Slab leak repair cost by source
| Source | Average (per job) | Typical range (per job) | Scope as published |
|---|---|---|---|
| Angi | $2,280 | $630 – $4,400 | Slab leak repair including detection |
| Fixr | $2,500 | $1,000 – $4,000 | Slab leak repair per job; low end $600 per job, high end $15,000 per job for full pipe rerouting |
| HomeGuide | (not listed) | $500 – $5,000 | Per job by method: pipe lining $500 – $3,500; digging and replacing pipe $700 – $5,000; slab replacement $5,400 – $10,800 |
Angi, HomeGuide and Fixr are separately owned publishers, and their pages state no shared sourcing. The three describe different scopes, so the averages are reported as published without a combined figure.
Cost by repair method
| Repair method | HomeGuide (per job) | Fixr (per job) | Angi (per job unless noted) |
|---|---|---|---|
| Sealing cracks | $100 – $200 | $100 – $200 | (not listed) |
| Patching | $250 – $800 | $250 – $800 | (not listed) |
| Pipe section repair or replacement | $200 – $2,000 | $200 – $2,000 | $250 – $850 |
| Pipe lining (CIPP) | $500 – $3,500 | $500 – $2,000 | $80 – $250 per linear foot |
| Breaking the slab / digging | $500 – $3,000 | $500 – $3,000 | (not listed) |
| Tunneling | (not listed) | $900 – $2,000 | (not listed) |
| Rerouting plumbing | $3,900 – $7,500 | $4,000 – $15,000 | $600 – $4,000 |
| Water main repair | $400 – $5,000 | (not listed) | $150 – $5,000 |
| Full slab replacement | $5,400 – $10,800 | (not listed) | (not listed) |
Slab leak repair cost by method, as published. HomeGuide and Fixr publish identical ranges for sealing, patching, pipe replacement and slab breaking; the pages state no shared sourcing. Rerouting estimates diverge widely across all three publishers and are reported as published. Angi prices cured-in-place lining per linear foot, like HomeGuide’s $90 to $250 per linear foot figure.
Detection, restoration and labor costs
| Cost item | Cost as published |
|---|---|
| Leak detection | Angi $150 – $400 per job, $280 average; Fixr $100 – $400 per job |
| Foundation inspection (HomeGuide) | $300 – $750 per inspection |
| Slab repair after the fix (Angi) | $300 – $6,750 per job |
| Build-back (Angi) | $300 – $10,000+ per job; about $2,000 on average |
| Water damage repair (Angi) | $500 to $15,000+ per job |
| Mold remediation (HomeGuide) | $1,500 – $6,000 per job |
| Foundation underpinning (Angi) | about $2,500 per pier; $5,000 – $10,000 per project |
| Excavation (Angi) | about $3,000 per job; +$2,000 or more if temporary supports are needed |
| Structural engineer (Angi) | $70 – $250 per hour, about $150 per hour typical |
| Permits | HomeGuide $30 – $500 per permit; Angi $75 – $200 per permit |
| Plumber hourly rate | HomeGuide $45 – $150 per hour; Angi $75 – $150 per hour, or $500 – $4,000 total labor |
| Emergency plumbing (HomeGuide) | $100 – $350+ per hour, nights, weekends and holidays |
Detection, restoration and labor costs. Sources: Angi, HomeGuide and Fixr. Permit ranges diverge across publishers and are reported as published.
How to check for a leak yourself
The EPA’s WaterSense program offers two simple checks before you call anyone. First, look at your water usage in a colder month like January or February: if a family of four exceeds 12,000 gallons in a month, there could be serious leaks. Second, check your water meter before and after a two-hour period when no water is being used – if the meter changes at all, you probably have a leak.[4] The stakes add up: the average household’s leaks waste more than 9,300 gallons of water a year, and fixing easily corrected leaks saves homeowners about 10 percent on water bills, according to the EPA.[4] A slab leak is beyond the easy-fix category, but the same meter test is how most hidden leaks first show themselves.
DIY or hire a plumber?
Angi frames the comparison directly: hiring a local plumber for slab leak repair costs around $2,200 on average, compared to a DIY average of $400 – and it strongly recommends hiring a licensed professional anyway.[1] The reason is structural, not cosmetic: cutting into or tunneling beneath a foundation can cause severe structural damage if done wrong, and foundation errors can put a household’s safety at risk.[1] With the publisher itself calling this strictly a licensed-plumber job, this guide carries no DIY procedure and no shopping link; the figures above are estimates for hiring the work out.
Related cost guides
See our guides to foundation repair cost, water line replacement cost, water damage restoration cost, mold removal cost and plumber cost.
Sources
- Angi – How Much Does Slab Leak Repair Cost? (updated September 22, 2026)
- HomeGuide – How Much Does a Slab Leak Repair Cost? (October 29, 2025)
- Fixr – Slab Leak Repair Cost (updated May 1, 2025)
- U.S. Environmental Protection Agency, WaterSense – Fix a Leak Week