Trenching & Utility Excavation
Trenching is the narrow, linear digging used to run underground lines from one point to another, and it starts with knowing what is already buried.
Utility trenching supports water and sewer service, electrical and low-voltage runs, gas lines, irrigation, drainage pipe, and conduit for outbuildings. Digging the trench is only one part of the job. The line or conduit has to be installed by the appropriate trade, the trench backfilled, and the surface restored.
Common applications
- Running power, water, or internet out to a garage, shop, barn, or guest structure
- Connecting a new build to municipal water or sewer service
- Replacing an aging or failing underground water or sewer line
- Installing conduit before a driveway, patio, or walkway is poured
- Burying downspout, footing, or yard drainage pipe
- Running lines for irrigation, gates, lighting, or a generator
Utility locating and 811
Before any digging, existing underground utilities need to be located and marked. In the United States, 811 is the national call-before-you-dig number. Contacting 811 (by phone or through your state's online request system) starts a free request for utility companies to mark their public lines. Most states require the request a few business days before digging begins; the exact notice period and rules vary by state.
Public utility locates generally do not cover privately owned lines, such as a power line from your house to a detached garage, a private water line, septic lines, or irrigation. Those may require a private locating service. If you know of lines like these, mention them when you request a quote.
The contractor performing the work is responsible for confirming locates are in place and for following the safety requirements that apply to trenching in your area. This page is general information, not digging guidance.
What affects the scope of a trench job
- Length of the run and how many connection points there are
- Required depth, which depends on what is being installed and local codes
- What the route crosses: lawn, gravel, pavement, landscaping, fences, or tree roots
- Soil conditions, including rock, clay, or wet ground
- How many existing utilities run near or across the route
- How the surface needs to be restored afterward
Describing your project
An approximate distance, what is being run, where it starts and ends, and what the route crosses gives a contractor a useful starting point. If an electrician, plumber, or builder is already involved, say so, since trenching often needs to be coordinated with their work.
Common questions
Do I need to call 811 before trenching on my own property?
Generally, yes. Underground utilities often run through private property, and 811 requirements typically apply to homeowners and contractors alike. Rules vary by state, so check your state's 811 center. The contractor doing the work will usually handle or confirm the locate request.
Will 811 mark the line to my detached garage?
Usually not. 811 locates generally cover lines owned by utility companies, not privately owned lines after the meter. A private locating service can often help with those.
Who installs the pipe or wire in the trench?
It depends on the project. Electrical, gas, and plumbing work is often handled by a licensed trade, with the excavation contractor digging and backfilling. Ask how the work is divided when you discuss a quote.
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