The cost per foot to run an electrical line underground is typically $10-$30 for a residential project, with a common average near $18 per foot. The final price depends on wire size and amperage, trench length and depth, soil conditions, permits, and whether the work includes a new panel or circuit.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Complete residential installation | $10 per ft | $18 per ft | $30 per ft | Trench, conduit or rated cable, wiring, and standard connections |
| 50-foot standard run | $500 | $900 | $1,500 | Assumes accessible yard and no major panel work |
| Trenching only | $4 per ft | $8 per ft | $15 per ft | Excavation and basic backfill; rocky ground can cost more |
| Permit and inspection | $50 | $200 | $500+ | Varies by municipality and project scope |
Assumptions: Typical U.S. residential yard, standard copper conductors, ordinary access, and a licensed electrical contractor.
What Does Underground Electrical Line Installation Cost Per Foot?
Most homeowners pay $10-$30 per linear foot for a complete underground electrical run. A straightforward 30-amp or 60-amp feeder serving a garage, shed, or outbuilding may fall toward the lower half of the range. A longer, higher-amperage run with larger conductors, deeper excavation, or challenging access can reach $30-$50 per foot or more.
A realistic planning figure is about $18 per foot, before unusual site work or major electrical upgrades. The per-foot price usually includes excavation, conduit or approved direct-burial cable, conductors, basic connections, and backfill. It may exclude permit charges, restoration of patios or landscaping, a subpanel, or an upgrade to the home’s service panel.
For budgeting, a 50-foot basic run often totals $500-$1,500, while a 100-foot run may cost $1,000-$3,000. Short runs can have a higher effective rate because mobilization, setup, and inspection costs are spread over fewer feet. Long distances can also require larger wire to limit voltage drop, so doubling the length does not always double the price.
Assumptions: Standard residential feeder or branch-circuit scope; no rock excavation, utility-company work, or extensive hardscape replacement.
How Trenching, Conduit, Wire, and Permits Shape the Quote
Quotes combine trade labor, materials, equipment, and administrative charges. The split varies with the route and electrical load: a simple lawn trench may have low equipment costs, while a circuit requiring heavy conductors and precise connections can be material- and labor-intensive.
| Quote component | Typical range | Pricing basis | What it covers |
|---|---|---|---|
| Trenching and backfill | $4-$15 per ft | Distance, depth, and soil | Excavation, trench preparation, and ordinary fill |
| Wire and conduit | $2-$12 per ft | Gauge, conductor metal, and raceway | Approved conductors, conduit, fittings, and warning tape where required |
| Electrician labor | $75-$150 per hour | Hours and crew size | Layout, pulling wire, terminations, testing, and coordination |
| Equipment and mobilization | $100-$600 per job | Machine access and rental | Trencher, delivery, setup, and equipment use |
| Permit and inspection | $50-$500+ | Local fee schedule | Permit application and required inspections |
| Disposal and surface repair | $100-$1,000+ | Excavated material and surfaces | Hauling, sod, pavers, driveway, or landscape restoration |
Trenching is only one part of the installed rate; conductor size and electrician time can be equally important. Materials for a modest circuit may run $2-$6 per foot, while larger feeders with expensive copper conductors can push wire and conduit costs above $10 per foot. Disposal and restoration are often quoted separately rather than included in a standard linear-foot rate.
Electricians may also charge a minimum service fee of $150-$300, especially for a short run or a separate visit. A labor estimate can be checked with . The formula is only a cross-check: some contractors quote a fixed project price that includes overhead, insurance, and warranty obligations.
Which Wire Gauge, Amperage, and Soil Conditions Raise the Rate?
Amperage and distance determine conductor size. A small 20-amp circuit to a nearby exterior outlet may use substantially less material than a 60-amp feeder to a workshop. A 100-amp outbuilding feeder often needs larger conductors, a subpanel, and more detailed planning; the installed rate can exceed $25-$50 per foot when the route is long or the site is difficult.
Specify both the intended load and the run length before comparing per-foot bids. At roughly 100 feet or more, voltage drop becomes a more important design consideration, especially for a heavy load. The electrician may recommend upsizing conductors, which raises material cost but can support proper voltage at the far end. Wire gauge should be selected by a qualified professional based on load, distance, installation method, and applicable code.
Soil and route conditions also affect the quote. Loose, accessible soil can be trenched quickly; rocky ground, roots, steep slopes, or a route beneath a mature tree may add $5-$20 per foot or require separate excavation charges. A trench crossing a driveway, retaining wall, or paved walkway can cost hundreds to several thousand dollars to cut and restore.
Required burial depth depends on wiring method, circuit characteristics, location, and adopted local code. Many residential installations require roughly 12-24 inches of cover, but that range is not a substitute for a site-specific code determination. The contractor should state the planned depth and method in the quote and confirm permit requirements with the local authority.
Where U.S. Trenching Prices Run Higher or Lower
Labor rates and local permitting create regional differences even when the electrical materials are similar. In lower-cost rural markets, a basic installation may price around 10%-20% below the national midpoint. Dense metropolitan areas and high-cost coastal markets can run 15%-35% above it, particularly when access is limited or licensed-trade rates are high.
Location can shift the total by hundreds of dollars on a 50-foot job. A $900 midpoint estimate could become roughly $720-$810 in a lower-cost market or $1,035-$1,215 in a high-cost city, before unusual soil or restoration. Rural properties may have lower hourly labor but longer travel charges, limited contractor availability, or higher mobilization fees.
Climate and ground conditions influence timing and excavation. Frozen soil, wet ground, or a high water table can make trenching slower or require a different method. In hot, dry regions, hard or rocky soil may raise excavation costs. These location effects are project-specific; a nearby comparable quote is more useful than assuming a broad regional average applies to every property.
Local permit fees and inspection practices should be checked directly through the municipality or contractor. Some jurisdictions require an electrical permit for a new feeder or buried circuit, while others may have additional rules for work near public rights of way or utilities. Utility-company charges are generally separate if the job involves a service connection rather than a private electrical line.
How Long Does a Residential Underground Line Take to Install?
A clear 30- to 60-foot yard run may take a two-person crew about 4-8 working hours, including layout, trenching, conduit or cable installation, wire pulling, terminations, and cleanup. A 100-foot feeder or a project with a subpanel can take 1-2 days. Permit approval and inspection scheduling may add days or weeks to the calendar without adding equivalent on-site labor.
Ask whether the quote separates labor time from equipment, permit, and restoration charges. A simple trench can be opened and filled quickly with a walk-behind trencher, but work slows around utilities, roots, narrow gates, or existing hardscape. Hand digging near marked utilities may take longer and is often necessary for safe clearance.
Contractor labor rates commonly fall around $75-$150 per hour, with a helper or excavation operator sometimes billed at a different rate. Rates are higher in some large cities and for emergency or after-hours work. A fixed-price quote should identify how many feet are included, the assumed trench route, and the extra charge for unforeseen obstructions.
Before digging, the contractor or property owner must arrange utility locating as required by state law, typically through the 811 system. Marked lines can force a route change or hand excavation. A private line locator may be needed for homeowner-installed utilities that are not covered by standard public utility marking.
Three Underground Line Quotes for Different Yard Runs
These examples show how scope changes the installed rate. Totals are illustrative and assume ordinary access, a licensed electrician, and no major panel replacement. Permit fees and local labor rates can move each estimate outside the stated range.
| Project example | Scope and rate | Labor assumption | Estimated total |
|---|---|---|---|
| Garage outlet | 35 ft, 20-amp circuit, $12-$20 per ft | 4-6 hours | $420-$700 |
| Detached workshop | 75 ft, 60-amp feeder and subpanel, $20-$35 per ft | 8-12 hours | $1,500-$2,625 |
| Long outbuilding run | 140 ft, 100-amp feeder, larger conductors, $28-$50 per ft | 12-20 hours | $3,920-$7,000 |
The workshop and long-run examples cost more because they require larger conductors and more electrical work, not simply more trench length. The 35-foot example assumes an existing panel with capacity, a simple yard route, and no driveway crossing. If a new subpanel, grounding work, or service upgrade is required, those items should appear as separate quote lines.
The per-foot rates in the examples include typical trenching, wiring, and installation but exclude unusually high permit charges and hardscape restoration. A contractor may set a minimum total, so a 20-foot run can cost more per foot than the 35-foot example even if its materials are cheaper.
Which Scope Choices Cut the Per-Foot Price Safely?
Reducing unnecessary scope is usually more effective than choosing undersized wire. Confirm the equipment load, voltage, and any likely future additions before requesting bids. An oversized feeder may increase conductor and panel costs, while a circuit planned too small can require expensive replacement later. A licensed electrician should determine a code-compliant size rather than relying on a lowest-price specification.
Keep the route direct and the bid scope identical when comparing contractors. Avoiding a driveway, patio, or garden wall can save several hundred dollars or more if another safe route is available. Homeowners can clear movable items and provide gate access, but should not dig near marked utilities or handle electrical terminations unless permitted and qualified to do so.
Ask whether a trencher can access the yard and whether the contractor can coordinate trenching with other planned underground work. Bundling electrical conduit with a scheduled landscape or utility project may reduce separate mobilization charges. If an existing conduit is present, have the electrician inspect its size, condition, and fill capacity; reuse may save excavation, but only when it meets requirements and is suitable for the new circuit.
Compare at least three written estimates that identify line length, trench depth, wiring method, conductor size, amperage, permit, inspection, backfill, surface repair, and warranty. A quote far below the others may omit critical work. Ask for the price of added footage and unexpected rock or hardscape work in advance, and check whether the contractor will obtain permits and arrange inspections.
Material choices can also affect the budget. Copper conductors are common, while aluminum may reduce conductor expense on some appropriately sized feeders but requires compatible terminations and installation practices. Do not select a material based only on its per-foot price. Have the electrician explain the full installed cost, code compliance, and maintenance implications for the specific circuit.