How much does trenching cost per foot in Virginia?

There is no single per-foot price for trenching in Virginia, and a figure quoted without a look at your yard is a guess. We did not find a primary source that dates a Virginia per-foot rate, so this page does not invent one. What it does give you is the list of things that move the price, in roughly the order they matter, and what to put in a written quote so three bids can be compared line by line.

What drives the cost of a trench

Length and depth. Cost scales with how much soil is moved, so a longer, deeper trench costs more per foot as well as in total. Depth also changes the safety rules: federal rules require each employee in an excavation to be protected from cave-ins by an adequate protective system, unless the excavation is in stable rock or is less than 5 feet in depth and examination of the ground by a competent person provides no indication of a potential cave-in.^[1] Shoring or a shield adds equipment and time.

What is in the ground. Clay, rock, roots and old fill slow a machine. So do existing lines. Virginia 811 says state law mandates a two-foot tolerance zone on either side of the marks, where only certain types of excavation are allowed, such as digging with hand tools.^[2] Every crossing means slower hand digging.

Access. A fenced backyard a machine cannot enter, a steep slope or a run under a mature tree can mean a smaller machine or more hand work.

What the trench crosses. Lawn is the cheapest to restore. Concrete, asphalt, a patio or a driveway has to be cut, patched or replaced, and boring under a hard surface is a different method with a different price.

The line itself. The trench is often the smaller part of the bill. Pipe, conduit, wire, fittings, a tracer wire or warning tape, and the connections at both ends are priced separately. Virginia's building code requires a permit before installations or alterations involving a water supply and distribution system, a sanitary drainage system or electric wiring,^[5] so permit fees and inspections belong on the list too.

Who does which part. Virginia's excavating specialty covers the construction, repair, improvement, or removal of water, gas, and sewer connections to residential, commercial, and industrial sites, subject to local ordinances, and its empty-conduit work is allowed only if each conduit system does not include installation of any conductor wiring or connection to an energized electrical system.^[6] Wiring means a licensed electrician, so expect a second line item or a second quote when power is involved.

Locating private lines. Virginia 811 says using its services is always free,^[2] but its notified utilities do not mark private lines such as those running from your home to a detached garage or shed, septic lines, propane lines and the sewer line between your house and the cleanout.^[3] If your route touches them, a private locator is an extra cost to expect.

Distance and paperwork. The law says the area covered under each locate request shall not exceed one-third of a mile,^[4] so a very long run needs more than one request and more coordination.

Getting a quote you can compare

Virginia's Board for Contractors advises getting at least three written bids, and an initial deposit of no more than 10% of the total price in most cases.^[7] Its guide says to insist on a detailed written contract and to limit the deposit to 10% down or $1,000, whichever is less.^[7] Ask each bidder to put in writing:

• the length, depth and width of the trench, and the route on a sketch of your lot
• the line, conduit or pipe being installed, its size and the material
• who requests the 811 markings and who hires a private locator
• what surface is restored, and to what standard, including grass seed or sod, gravel or paving
• who pulls the permit. The Board's guide says the contractor should apply for and obtain any necessary building permits, and that this should be spelled out in your contract.^[7]
• what happens if the machine meets rock or an unmarked line, and how a change in the price is agreed

A bid that is far below the others often leaves out restoration, the permit, a locator or the wiring.

When to call a licensed pro

Trenching for a utility line is not a job to price by the foot and then do yourself: the cost of a mistake, a cut gas, water, electric or communications line or a collapsed trench, is far larger than any saving. Virginia requires a Class C licence for a single contract over $1,000 but less than $30,000, with higher classes above that.^[8] Check the licence on DPOR before you sign.

For the full sequence of the work, read what trenching for a utility line involves and who is responsible for marking underground utilities in Virginia. Browse excavation services or read more excavation answers. To get prices for your own yard, describe the job once and licensed local businesses quote it.