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Lafayette · Local Project

Under-Slab Sewer Line Replacement and Concrete Repair

We completed an interior sewer line replacement involving trench excavation through a concrete slab, installation of new 4-inch ABS sewer piping, compacted backfill, and concrete restoration. The project included work extending from a bathroom into an adjoining living area.

Real work completed by In Demand Plumbing, Heating & Air for a local Lafayette property.

Project completed November 4, 2026.

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New 4-inch ABS sewer pipe installed in an excavated trench during an under-slab sewer line replacement.
New 4-inch ABS sewer line installed beneath the concrete slab to replace the existing underground piping.

The problem

What we found.

The home's existing underground sewer line required replacement beneath the concrete slab. Accessing the damaged piping involved opening the floor through the bathroom and adjoining living area to expose the sewer line and correct the plumbing issue.

The solution

What our team did.

Our plumbing technicians excavated an interior trench approximately 15 feet long and up to 5 feet deep to access the existing sewer piping. The crew installed new 4-inch ABS sewer piping and fittings, including branch connections, and prepared the pipe bedding with base rock to establish proper support and grade. After installation, the trench was backfilled and compacted. The concrete slab was then restored to the surrounding floor level, leaving the area ready for the next stage of flooring restoration.

Project photos

See the work.

Photos from this Lafayette project completed by In Demand Plumbing, Heating & Air.

New 4-inch ABS sewer pipe installed in an excavated trench during an under-slab sewer line replacement.
New 4-inch ABS sewer line installed beneath the concrete slab to replace the existing underground piping.
Close-up of new ABS sewer piping and branch connection installed beneath a residential concrete slab.
Replacement sewer piping and branch connections installed before trench backfilling and concrete restoration.
Plumbing technicians installing replacement ABS sewer pipe inside an excavated residential concrete slab.
Our plumbing technicians installing new sewer piping beneath the home's concrete foundation.
Existing underground sewer pipe exposed during interior concrete slab excavation for sewer repair.
Excavating beneath the home's concrete slab to access the existing sewer line before replacement.
Plumbing technician excavating beneath a concrete slab to access an underground residential sewer line.
Carefully excavating the interior sewer trench to access and replace the underground piping.
Interior sewer trench with aggregate base and reinforcement mesh prepared for concrete slab restoration.
Preparing the excavated sewer trench for concrete restoration following underground pipe replacement.
Fresh concrete slab patch covering a completed under-slab residential sewer line replacement.
Concrete slab restored after installation of the new underground sewer piping.
Finished concrete floor patch after residential under-slab sewer line replacement and trench restoration.
Completed concrete restoration following replacement of the sewer line beneath the home's floor.
Existing bathroom toilet and tile flooring before sewer line replacement.
Existing bathroom floor conditions before sewer repair.

Related local services

Services related to this Lafayette project.

Learn more about the plumbing and HVAC services connected with this project.

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