Slab Leak Repair Cost: Complete Guide

Cost by Repair Method

The repair method accounts for the biggest portion of the total bill. Each approach has a different price range because the labor, equipment, and disruption levels vary significantly.

Spot repair (jackhammer through the slab) costs $800 to $2,500 for the plumbing work alone. The plumber breaks through the concrete at the leak location, exposes the damaged pipe, replaces the failed section, and patches the hole. This is the cheapest repair option, but it requires demolishing the flooring above the access point. Add $500 to $2,000 for concrete patching and $1,000 to $5,000 for flooring replacement depending on the material. A spot repair on a carpeted area might total $1,800 to $4,000, while the same repair under ceramic tile could reach $3,000 to $6,000.

Tunneling under the foundation costs $1,500 to $4,000. A crew digs an access pit outside the home and bores a horizontal tunnel beneath the slab to reach the pipe. The pipe is repaired from below, the tunnel is backfilled, and the access pit is filled. The main cost advantage of tunneling is what it avoids: there is no interior demolition, no flooring to replace, and no concrete to patch. The total project cost stays close to the base plumbing number. Tunneling works best for leaks near the perimeter of the slab, since tunneling to the center of a large slab adds length, labor, and cost.

Pipe rerouting costs $2,500 to $6,000 or more. The plumber abandons the leaking pipe entirely and runs a new line through the walls, ceiling, or attic to bypass the slab. Rerouting is more expensive upfront than other methods, but it eliminates all future slab leak risk on that line and requires no concrete work. Some plumbers recommend rerouting when a spot repair reveals additional corrosion along the same line, since fixing one spot only to have another fail six months later costs more in the long run.

Epoxy pipe lining costs $500 to $3,500 depending on pipe diameter and the length of the section being lined. A flexible tube coated with epoxy resin is inserted into the pipe, inflated against the interior walls, and cured in place. The result is a smooth, corrosion-resistant liner inside the original pipe. Lining is the least disruptive method since it requires no concrete cutting or excavation, but it only works when the host pipe is structurally sound enough to support the liner.

Full repiping costs $4,000 to $15,000 for a whole house. This replaces all of the supply lines, typically routing new PEX tubing through walls and attic space so nothing runs under the slab anymore. Repiping makes the most financial sense when a home has had multiple slab leaks, when the copper plumbing is more than 40 years old, or when the cost of individual repairs is approaching the cost of replacing everything at once.

Cost of Detection

Before any repair work begins, a leak detection specialist needs to find the exact location of the leak under the slab. Standard electronic acoustic detection costs $150 to $300. The technician uses amplified listening equipment to locate the sound of water escaping the pipe through the concrete.

More advanced detection methods cost $300 to $500. Thermal imaging, helium tracer gas testing, and electromagnetic pipe locating fall into this range. These methods are used when the leak is too small for acoustic detection, when the slab is unusually thick, or when the technician needs to map the pipe layout before recommending a repair approach.

Some plumbing companies waive or discount the detection fee if you hire them for the repair. Others charge a flat diagnostic fee that covers both detection and a written repair recommendation. Ask about this before scheduling, because it can save $150 to $300 on the total project.

Restoration Costs After Repair

The plumbing repair is only part of the bill. Unless you chose tunneling, rerouting, or lining, you will also need to restore the area that was opened up during the repair.

Concrete patching costs $500 to $2,000 depending on the size of the access hole. A standard spot repair requires a hole roughly 2 to 4 feet across, which costs toward the lower end. Multiple access points or a larger demolition area push the cost higher.

Flooring replacement varies widely by material. Carpet costs $3 to $8 per square foot for materials and installation, making a typical repair area $300 to $800. Vinyl or laminate runs $4 to $10 per square foot, totaling $400 to $1,200. Ceramic or porcelain tile costs $7 to $25 per square foot, and matching discontinued tile adds even more. Hardwood flooring costs $8 to $15 per square foot, and refinishing the surrounding floor to blend the patch can add $2 to $5 per square foot across a larger area.

Drywall repair applies when the slab leak caused water to wick up into the lower wall cavity. Replacing wet drywall costs $300 to $1,200 per affected section, including taping, mudding, and painting.

Secondary Damage Costs

If the leak ran for weeks or months before detection, the secondary damage can cost more than the repair itself. These costs are separate from the plumbing and restoration work above.

Mold remediation costs $1,500 to $5,000 for a localized area. Slab leaks create persistent moisture under flooring that is ideal for mold growth. If mold is found in the carpet padding, subfloor, or lower drywall, a remediation company removes the contaminated material, treats the area, and verifies clearance before new materials are installed.

Foundation repair costs $3,000 to $10,000 or more if the escaping water caused the soil to shift and the slab to settle or heave unevenly. Foundation leveling using piers or mudjacking is typically handled by a separate foundation contractor after the plumbing repair is complete. The foundation work often costs more than the plumbing repair itself.

Water damage restoration (professional drying, dehumidification, and sanitization) costs $1,200 to $5,000 depending on how much of the home was affected. Restoration companies use industrial fans, dehumidifiers, and moisture meters to dry the structure before any rebuilding begins.

What Drives the Cost Up

Leak location is the biggest variable. A leak near an exterior wall is accessible by tunneling ($1,500 to $4,000 total project). The same leak in the center of a large slab under a finished room might require breaking through tile flooring, which could push the total to $4,000 to $8,000 after restoration.

Multiple leaks multiply every cost category. Each additional leak needs its own repair and its own restoration area. Two spot repairs cost roughly 1.5 to 2 times a single repair because some setup costs are shared, but three or more leaks usually tip the recommendation toward rerouting or repiping the entire line.

Emergency timing adds a premium. A slab leak discovered on a weekend or holiday typically carries an emergency surcharge of $100 to $300 from most plumbing companies. After-hours calls during weekday evenings may carry smaller surcharges of $50 to $150.

Post-tensioned slabs require extra care during any break-through repair. The tensioned steel cables in these slabs must be located and avoided, which adds detection time and limits where the plumber can cut. Accidentally cutting a post-tension cable can cost $1,000 to $3,000 to repair and creates a structural safety issue.

Permit requirements vary by jurisdiction but typically add $75 to $300 when required. Most municipalities require permits for plumbing work that involves breaking through or tunneling under the foundation. Some also require an inspection after the repair is complete.

How to Keep Costs Down

Act fast. The longer a slab leak runs, the more secondary damage it causes. Catching a leak within the first week keeps the project in the $2,000 to $4,000 range for most homes. Waiting a month or more can double or triple the total because of mold, foundation movement, and flooring damage that would not have occurred with an earlier response.

Get multiple estimates. Slab leak repair pricing varies significantly between companies, partly because different plumbers favor different repair methods. Get at least two written estimates and ask each plumber to explain why they recommend their approach over the alternatives. You may find that a slightly more expensive method avoids thousands in restoration costs.

Ask about combined pricing. Some plumbing companies offer package pricing that bundles detection, repair, and concrete patching. These packages can save 10% to 20% compared to hiring each service separately.

Check your insurance first. Contact your insurance company before authorizing repairs. If the resulting water damage qualifies as a covered loss (sudden and accidental), the restoration, drywall, and flooring costs may be reimbursable. The pipe repair itself is almost never covered, but the secondary damage claim can offset thousands in out-of-pocket costs.