Trenches opened right, marked first, closed properly
Utility trenching is where excavation meets consequences, because every trench in this county runs near something that must not be hit. We open sewer, water and power trenches at the published $25 to $80 per foot, dig lateral replacements at $3,500 to $12,000 and answer genuine emergencies at a stated after-hours rate. Every dig starts with DigAlert marks, which California law requires at least two working days before excavation, and the potholing shovel finishes what the paint on the ground cannot promise.
The lateral problem under the old neighborhoods
San Diego’s prewar and postwar neighborhoods run on clay sewer laterals that have reached the end of long lives, and the lateral is the homeowner’s responsibility all the way to the connection. When yours fails, the plumber handles the pipe and someone has to handle the ground: a trench to depth, proper bedding, protection during inspection and compacted backfill that will not settle into a driveway dip two winters later. That ground work is ours, on published numbers, in National City’s century-old blocks and everywhere the postwar grid spread.
When the trench cannot wait
Some failures set their own schedule: a lateral backing sewage into a house, a water line undermining a slab, a storm cutting a channel toward a foundation. Emergency work runs on a published call-out of $500 to $1,000 plus the hourly rate, and the honest part of emergency service is triage: making the situation safe and contained tonight, then finishing at daytime prices when the sun and the utility marks allow. A crew based in the county reaches most of the service area fast, and whoever answers the phone will tell you plainly whether your situation is the tonight kind.
Trenching questions, answered
What does a trench cost per foot in San Diego?
Our published range is $25 to $80 per linear foot, and three things place you in it: depth, soil and what sits on the surface. A shallow run through open lawn prices at the bottom; a five-foot-deep line through cemented soil under a driveway prices at the top, with the concrete restoration as its own honest line.
My sewer lateral collapsed. How fast can a trench open?
Emergency utility failures jump the queue, and the published after-hours call-out is $500 to $1,000 plus hourly rather than a number invented under pressure. Legally required utility marks constrain even emergencies, though DigAlert offers an emergency notification path for exactly these cases and we know how to use it.
Do you put in the pipe or just dig?
We open the trench, bed it properly, protect it while your plumber or electrician sets and inspects their work, then backfill and compact in lifts. The trades stay in their licensed lanes, the sequencing stays ours and you get one schedule instead of a standoff.
Can water, power and sewer share one trench to a new ADU?
Code allows certain utilities to share a trench at specified separations, and sharing saves real money on long runs. We design the trench plan with your plumber and electrician so the inspectors sign off the first time.
The one-call law and the free marking service are explained at digalert.org. Long utility runs for new backyard units are covered on the ADU site prep page by Cabrillo Excavation.
Get the trench priced
Send the address and the run you need. For active failures, skip the form and call (619) 975-1546 now.