Trenchless is great, but it isn't always right. Sometimes digging is the honest answer, and here's when.
Written byNew Pro Plumbing·Reviewed byMiguel Lopez, Owner & Licensed Plumber, New Pro Plumbing (CSLB #974600)·Last reviewedSeptember 2026 · 8 min readQuick Answer
Open-trench sewer repair means excavating to expose and replace a section of sewer line. It's the right choice for bellies that need regrading, lines that must be rerouted, some bad connections, and short, shallow sections where digging is simpler than trenchless. In Mar Vista, we most often dig for bellies in older laterals and for reroutes during remodels or ADU projects.
Trenchless methods renew a pipe along its existing path. They're excellent for cracks, roots, and collapses, but they can't change where the pipe runs or how it slopes. If a section has sagged into a belly, needs to be rerouted around a new foundation, or has a failed connection that needs rebuilding, excavation is often the only way to do it right. This page is part of our complete guide to sewer line repair in Mar Vista.
Open-Trench Sewer Repair: Open-trench sewer repair is the excavation and replacement of a section of sewer line, used when trenchless methods can't correct grade, route, or connection problems.
Digging also makes sense for short, shallow sections with nothing but soil above them. In those cases, excavation can be simpler and less expensive than bringing in trenchless equipment. The key is keeping the dig targeted: locate precisely, dig only what's needed, and restore carefully.
In Mar Vista, we most often dig for bellies in older laterals and for reroutes during remodels or ADU projects. Bellies in older Mar Vista laterals are a common reason for a targeted dig.
The camera and locator mark exactly where and how deep to dig.
Excavation is limited to the problem section.
New pipe is bedded at the correct slope and connected properly.
The inspector signs off, then we backfill and restore the surface.
Camera first, always. Every recommendation starts with a recorded inspection you can watch yourself, and a flat-rate price you approve before we start.
We dig on Mar Vista properties when the problem calls for it. The most common reasons are bellies in older laterals, where settling has created a sag that holds water, and reroutes during remodels or ADU projects, when a new foundation sits over the old line. We keep excavation targeted. The camera and locator tell us exactly where the problem is, and on a typical Mar Vista lot that often means one small section of yard or parkway, not a trench from the house to the street. If the rest of the line needs work, we'll often line it and dig only where we must.
Much of Mar Vista's housing is seventy to a hundred years old, and sewer laterals from that era were laid in short clay or cast-iron sections with a joint every few feet. Kitchen remodels and added bathrooms have pushed more flow through lines that were sized and laid for a smaller house. We pull the City permit, book the inspection, and leave the property as clean as we found it.
Not sure what your line needs? We camera it first, then quote a flat rate.
Get a Free Quote| Detail | Mar Vista |
|---|---|
| Area | Mar Vista, CA 90066 |
| Jurisdiction | City of Los Angeles |
| Permits | LADBS (City of Los Angeles) |
| Typical access | A cleanout or fixture; targeted excavation only when needed |
| First step | Camera inspection with a copy of the recording |
| Pricing | Flat-rate, in writing, before work starts |
| Availability | 24/7, including weekends and holidays |
| License | CSLB #974600, insured |
| Languages | English and Spanish |
Sewer lateral work at a Mar Vista address falls under the City of Los Angeles, with permits issued and inspected by LADBS. LA Sanitation has offered lateral rebates for CCTV inspection and for repair to qualifying owners who pay the City sewer service charge, while annual funds last, so it's worth checking before you start. We time the permit, the work, and the inspection so the line is out of service as briefly as possible.
Example scenario below is illustrative, based on common situations we see. Details vary by property; not a specific customer.
A Mar Vista homeowner adding a rear addition finds the new foundation would sit over the old sewer line.
We reroute that section around the addition with a targeted excavation and line the remaining clay lateral.
The addition proceeds on schedule, and the sewer line is both relocated and renewed.
Licensed by the CSLB (#974600) and insured, New Pro has been fixing Westside sewer lines, including in Mar Vista, since 2010. Permits and inspections are part of the job, and part of the price. We keep the camera recording and job records, so you have a history if you ever need it.
Also serving neighborhoods near Mar Vista: Del Rey, Culver City, Westdale, Mar Vista Hill. See all Westside service areas.
The Bottom Line
When a line needs regrading, rerouting, or a rebuilt connection, digging is the right tool. We keep it targeted and restore the site carefully.
A liner follows the existing pipe, so it keeps the sag. Only excavation and re-bedding can fix the slope. An open trench is the right method when the line has significant bellies, needs regrading, or has failed lining prep. See our repair pillar for methods.
Only as big as the problem section and the work space needed. Precise locating keeps it small. Trenches deeper than about five feet need to meet Cal-OSHA excavation and shoring rules. We include the shoring plan in the quote when it applies.
Yes. We backfill, compact, and restore the surface. If there’s concrete or pavers, we’ll discuss restoration in the quote. Restoration (concrete, pavers, landscape) is quoted as its own line item, not buried in the pipe cost, so you can compare it against trenchless.
Yes. A common approach is a small dig at the belly and lining for the rest of the line. Even when trenching is required, we usually keep the trench as short as possible and use trenchless for the rest of the run. That saves surface restoration.
Mostly for bellies that need regrading and reroutes during remodels or ADU projects. We keep the dig targeted to the problem section. In Mar Vista, we minimize trenching by combining a spot dig with trenchless for the rest of the run. See Mar Vista sewer repair hub.
This page was written by the New Pro Plumbing content team and reviewed for technical accuracy by Miguel Lopez, owner and California-licensed plumber (CSLB #974600). Agency rules are summarized from the official sources above; programs and requirements can change, so confirm current details with the agency. Nothing here is a quote. We confirm scope and pricing in writing before any work begins.
What’s new: September 2026, first publication.
Trenchless is great, but it isn't always right. Sometimes digging is the honest answer, and here's when.
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