Trenching typically costs $8 to $30 per linear foot, depending on depth, soil conditions and what the trench has to cross on its way. Shallow runs in open ground sit at the bottom of that range. Deep trenches, rocky ground, or a route that cuts through a driveway or finished landscaping sit well above it. Treat every figure on this page as a starting point rather than a quote: the cost per foot on the same property can vary by a factor of three depending on the route chosen.
Trenching is rarely the whole job. It is the excavation stage for something else — a drain, a water line, a power or fibre run, a footing — and the pipe, conduit, bedding stone and backfill are usually quoted separately. Getting clear on what is and is not included is the single most useful thing you can do before comparing prices.
Recommended Equipment
Excavator, or a skid steer with a trenching attachment. Depth and precision decide between them: a trencher attachment is faster and leaves a narrower, tidier cut on shallow straight runs in open ground, while an excavator is what you need once the trench goes deep, has to hold a precise fall, has to work around services already in the ground, or is being dug where the walls will not stand on their own.
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What actually drives the price
Depth is the primary driver and the relationship is not linear. A shallow trench is a single pass. Once a trench gets deep enough that the walls will not reliably stand, it has to be benched, sloped back or shored, which widens the excavation considerably and multiplies both the spoil and the time. This is a safety requirement, not an upsell.
Soil conditions set the pace. Sandy or loamy ground cuts quickly. Clay is slower and holds water. Rock is the condition that changes everything, and even scattered cobble can force a switch from a trencher to an excavator partway along a run.
What the trench crosses matters as much as its length. A straight run across open lawn is cheap. The same length crossing a paved driveway, a retaining wall, mature tree roots or an existing service means saw-cutting, hand digging, and restoration afterward, each of which is its own cost.
Existing buried services are both a cost and a risk. Utility locates are free in most areas and are non-negotiable. Private services — irrigation, invisible fence, a line to a detached garage, an old septic run — are usually not covered by a public locate and are the most common thing hit.
Backfill and restoration close out the job. Some trenches can be backfilled with the material that came out. Others need bedding sand under the pipe and clean granular fill above it, all of which is imported. Compaction matters if anything is driving over it later, and a trench backfilled loosely will settle into a visible trough within a year.
A short checklist before you book
Know the required depth, which is usually set by frost line or by code for the service being run. Walk and mark the route, and note everything it crosses. Arrange public locates and separately identify private services. Confirm whether pipe, conduit and bedding are in the quote or supplied by you. Ask what backfill material is being used and what compaction is included. Confirm who restores lawn, driveway or hardscape afterward. Ask whether the price is per foot or per hour, and what triggers a change.
Costs vary by site conditions. Use the ranges here to sanity-check what you are quoted, then get a direct price for your own property.
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