Permit Prices › Dallas › Slab Leak Repair
Slab leak repair cost in Dallas: what 498 city permits show
The median declared value for residential under-slab plumbing repair in Dallas was $9,038. Half of all jobs fell between $5,193 and $16,105.
Median$9,038
Middle half of jobs$5,193 to $16,105
8 in 10 jobs$3,000 to $30,000
Permits counted498
Most Dallas homes sit on a concrete slab, so a leaking water or drain line often means digging a tunnel under the house. The permits for that work had a median declared value of $9,038.
The descriptions show why the range is wide: a five-foot tunnel to one leak and a forty-five-foot tunnel to replace a drain line are the same kind of permit.
What stands out
- Half of all jobs were declared between $5,193 and $16,105.
- One job in ten was declared at $30,000 or more.
What this number is, and is not
- It is the job value a contractor declared on a City of Dallas permit application. It is not an invoice, and the city does not audit it.
- It covers work done under a permit inside the city limits. Jobs done without a permit, and jobs in the suburbs, are not in the file.
- It describes the spread of past jobs. It is not a quote for your home.
- How we picked these permits: Plumbing permits whose description names a slab leak, work under the slab, or a tunnel. Many of these also count as sewer line jobs.
Before you sign
- Put your quote next to the middle-half range above. If it sits outside, ask what is different about your job.
- Ask whether the price includes pulling the city permit, and ask for the permit number.
- Get the scope in writing: the tunnel length in feet, which line is being repaired, how the tunnel is backfilled, and whether a pressure test is included.
- Texas licenses plumbers through the Texas State Board of Plumbing Examiners (TSBPE). Search TSBPE licenses.
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Source: City of Dallas Building Permits (Dallas OpenData, dataset e7gq-4sah), read November 15, 2026. Values between $150 and $150,000 are counted. Full method.