Full replacement installation: the work, day by day

Full replacement installation is a 2 to 5 day job that replaces the pipe from the house to the municipal main. The sequence is fixed even when the method is not: find the route, open it, lay new pipe to a continuous slope, connect both ends, pass inspection, then put the ground back. The day the line is cut over is the only day without sewer service.

What the work is

Full replacement means the old lateral is taken out of service entirely and a new pipe is installed along the route, either in an open trench or by pipe bursting. It is not a repair, and it is not a liner: the pipe in the ground is new, and so is every joint. That is why the price band is $5,000 to $15,000 rather than the $1,500 to $5,000 of a spot repair.

Three methods

The choice is made on camera evidence and on what sits above the line. A collapsed pipe rules out both bursting and lining. A route under a finished driveway favors bursting, because two pits disturb less than a continuous trench.

Open trench, step by step

This is the sequence a competent crew runs on a conventional replacement.

1. Camera and locate. The existing line is cameraed and located, and the route is marked on the surface. Utility locates are requested through 811 and private lines are marked separately.
2. Excavate and shore. The trench is opened from the house connection to the municipal main, with shoring or sloping wherever depth requires it. Spoil is staged on tarps or hauled out.
3. Set the new pipe. Pipe is laid on bedding at a continuous fall, typically a quarter inch per foot for a 4-inch line, with cleanouts at the house and at intervals along the run. Fittings are glued or banded depending on material.
4. Connect both ends. The house connection is tied into the building drain, and the downstream end is tied into the municipal wye or the septic tank inlet. This is the step that decides whether the job passes inspection.
5. Test and inspect. The line is water tested and cameraed, and the municipal inspector signs off before any backfill. A failed inspection means the pipe comes back out of the ground.
6. Backfill, compact, restore. Bedding and backfill go in lifts, compacted to limit later settlement, and the surface is restored. Concrete is typically a second visit after curing.

Step 5 is the one to be present for. Once the trench is closed, every correction costs excavation again.

Pipe bursting, in outline

Bursting replaces pipe without a continuous trench. The crew opens a pit at each end, feeds a bursting head through the old line from the upstream pit, and pulls new high-density polyethylene behind it. The old pipe fractures outward into the soil and the new pipe occupies its path.

It fits when the old pipe is deteriorating but still continuous, when the route has few bends, and when the new line does not need to be upsized much. It does not fit when the pipe has collapsed, when there are major offset joints, or when the route passes close enough to a foundation or utility that outward fracturing is a risk.

The pipe bursting installation sequence covers pit design and pulling forces in more detail.

The timeline

Weather moves these numbers. Frozen ground slows excavation, and saturated soil can stop a backfill because compaction cannot be verified in mud.

Permits and inspection

Most jurisdictions require a permit for a sewer lateral replacement, and the permit is not paperwork. It is what triggers the municipal inspection that protects you.

The contractor should pull the permit, not you. A company that asks the homeowner to pull it is usually a company without the license or insurance to hold one.

The inspector looks for three things: continuous slope without a sag, watertight joints, and correct connection at both ends. Camera footage and a water test are the usual evidence. Get a copy of the signed inspection card; it matters at resale.

What changes the plan mid-job

Three surprises are common enough to plan around.

A utility across the route. Gas, water, and electric lines cross laterals more often than expected. Hand digging around them adds hours and sometimes requires the utility to stand by.

A collapsed section under a structure. If the old line passes under a porch or an addition, open trench may not be possible for that stretch, and the job shifts to bursting or to a short directional bore.

A deeper main than expected. The municipal main may sit lower than the drawings suggest, which means more excavation at the downstream end and a longer run of pipe.

Each of these should produce a written change order before the work continues. A verbal agreement on a price change is how disputes start, and it is the leading complaint in full replacement reviews.

What to do next

1. Get the camera inspection at $200 to $500 and watch the footage before agreeing to replace anything.
2. Confirm the route and depth in writing, with the footage measured from the house to the main.
3. Ask which method is proposed and why, and get one alternative priced.
4. Confirm the contractor pulls the permit and that the inspection happens before backfill.
5. Photograph the open trench, the bedding, and the slope before the pipe is covered.
6. Hold back final payment until the inspection card and the post-installation camera file are in hand.

The cost side of the same job is in full replacement cost, and the ways it goes wrong are in full replacement problems. For the method comparison, full replacement vs trenchless lining sets the two routes against each other.