Renting a Trencher For Underground Fence or Electronic Fence Lines

Running wire for an underground pet fence or an electric fence line means cutting a narrow slot through the yard, sometimes hundreds or even thousands of feet of it. Doing that with a shovel or a lawn edger is slow, uneven and hard on your back.

Hand-trenching a long perimeter can eat a whole weekend and still leave a ragged line that is awkward to lay wire into and harder to close back up. There is a faster way.

Renting a trencher cuts a clean, consistent slot about as fast as you can walk. This guide covers how to choose one, how deep to go for each kind of fence and how to use it safely.

Why a Trencher Is the Right Tool for Fence Wire

A trencher exists to do one thing well: cut a narrow, uniform slot in the ground as you move along a line. That is exactly what burying fence wire calls for.

What it does that hand tools can't

A walk-behind trencher cuts a clean slot a few inches wide at walking speed, with a rotating chain that does the digging and lays the soil neatly alongside for easy backfilling. It is built for the long continuous runs these systems need, whether that is a pet-fence loop around the whole yard or an electric-fence lead-out from the energizer to the fence line.

When it is worth renting

A shovel or edger is fine for a few feet. Once you are measuring the run in hundreds of feet, a trencher pays for itself in time and effort, and one person can handle a walk-behind unit. A typical residential pet-fence loop runs 500 to 1,000 ft or more once you trace the full perimeter, and a pasture electric-fence run can be far longer, which is exactly the scale where hand-digging stops making sense.

Call 811 Before You Dig

Before any digging, this step comes first, every time.

Call 811 or submit a request online to have your underground utilities located and marked, at no cost, a few business days ahead of your project. Trenching blind risks striking a gas, electric, water or communication line, which is dangerous and expensive. Once the lines are marked, flag your own planned fence route with paint or flags and keep your trench clear of the utility marks. A shallow pet-fence trench is not an exception to this; call 811 regardless of how deep you plan to go.

Choosing the Right Trencher

For fence wire, the choice is usually straightforward.

Why a walk-behind is the usual pick

A walk-behind trencher is the typical rental for this work: maneuverable, in the right depth range and manageable for one person. Match the machine to your run length and the depth you need, which the next section covers.

Soil, roots and what a trencher can't cut

Trenchers handle soil, turf and small roots well. Rocky ground and large roots slow them down, and they are not made for rock or concrete, so plan a route that avoids those where you can. If your ground is hard and dry, watering the route a day ahead softens the soil and makes for a cleaner, easier cut.

Getting it home

A walk-behind trencher is compact but heavy, ranging from several hundred pounds to over half a ton depending on the model, so plan to haul it on a trailer or in a truck bed and secure it before you drive. Read more about how to load a trailer for loading and tie-down.

How Deep to Trench for Fence Wire

Depth depends on which kind of fence you are wiring, so check your system's instructions and treat these as general guidance.

Underground or invisible pet fence

The boundary wire for a pet containment system goes shallow, roughly 1 to 3 in. That is deep enough to protect it from mowing and aeration without needing to go any deeper, and the slot only has to be wide enough to drop the wire into, so the narrow cut a trencher makes is ideal.

Electric fence lead-out wire

Insulated lead-out or feeder wire running from the energizer should sit deeper, below mower blades and hooves, and below the frost concern in cold climates. That often means 6 in or more. Burying the lead-out lets livestock, vehicles and mowers cross the line without contacting a hot wire, and it keeps the connection from the energizer protected.

Crossings

Wherever the wire crosses under a driveway, gate or walkway, run it through conduit to protect it from crushing and traffic. Plan these crossings before you start trenching so you have conduit cut to length and ready at each one. Always confirm the recommended burial depth in your specific fence system's instructions.

Trenching and Laying the Wire

With the route marked and the machine on site, the work itself is steady and methodical.

Run the machine slow and along the line

Guide the trencher along your marked route, moving slowly and letting the chain do the work; most walk-behind units dig as you back up along the line. Ease through roots and rocks rather than forcing the machine, which protects both the trencher and you. Keep bystanders, kids and pets well clear while it is running, since the digging chain is exposed and unforgiving, and wear sturdy boots, eye protection and gloves. Read the machine's controls and stop procedure before you start.

Lay, protect and backfill

Set the wire into the slot, running it through conduit at any driveway or gate crossings. Then backfill and tamp the soil so the slot closes and the turf recovers. Leave a little slack and follow the fence manufacturer's guidance for splices and connections. It is worth photographing or sketching the finished route before you backfill, so you know where the wire runs if you ever need to repair or extend it. A clean, consistent slot is far easier to lay wire into and close back up than a hand-dug line, which is most of the reason to rent the machine in the first place.

What about insurance and damage protection?

Before towing a rented trailer, contact your auto insurance provider to ask whether your policy covers liability and towing-related damage claims.

Eligible rentals booked through Big Rentals also include Basic Rental Protection at checkout. This added protection can help limit your financial responsibility for certain damage or theft events during the rental period.

For full details on how Basic Rental Protection works, including deductibles, exclusions, and renter responsibilities, review our FAQ and platform terms.

The Short Version

• A walk-behind trencher cuts a clean, narrow slot for fence wire far faster than hand-digging a long run
• Call 811 to have utilities marked before you dig, and keep your trench clear of the marks
• Pick a walk-behind unit sized to your run; trenchers cut soil, turf and small roots, not rock or concrete
• Pet-fence wire goes shallow, roughly 1 to 3 in; electric-fence lead-out wire goes deeper, often 6 in or more
• Run conduit under driveways and gate crossings, and follow your fence system's depth and connection instructions
• Lay the wire, backfill and tamp, and plan how you will haul and secure the machine

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