The cost to install a subpanel in a detached garage typically ranges from $1,200 to $4,500, with many standard projects averaging about $2,600. The distance from the house, required feeder capacity, trenching, electrical service condition, and local permit rules have the biggest effect on the quote.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Complete installation | $1,200 | $2,600 | $4,500 | Common 60-100 amp subpanel with ordinary access |
| Subpanel and breakers | $150 | $350 | $800 | Price depends on amperage, circuit count, and brand |
| Feeder wiring | $4 | $9 | $18 per linear ft | Wire type, gauge, and route affect rate |
| Trenching | $8 | $18 | $35 per linear ft | Higher where rock, concrete, or landscaping complicates digging |
| Permit and inspection | $50 | $200 | $500 | Local fees and required inspections vary |
Typical detached-garage subpanel prices by project size
A basic installation generally costs $1,200-$2,000 when the garage is close to the house, the feeder route is accessible, and the existing service has enough capacity. This usually covers a modest 60-amp panel, a short feeder, grounding and bonding work, a few branch circuits, and standard labor. It does not assume a long trench or major service upgrade.
A more typical project lands at $2,000-$3,500. This range can cover a 60- or 100-amp panel, about 40-80 feet of feeder route, ordinary trenching or surface routing, permit fees, and several circuits for lights, outlets, or a garage door opener. Larger garages and workshops may need more circuits and a higher-capacity feeder.
Complex installations can reach $3,500-$7,000 or more if the route is long, the yard has concrete or rock, the main panel needs replacement, or the utility service must be upgraded. For a routine detached garage with a moderate feeder run, budgeting around $2,000-$3,500 is a practical starting point.
Assumptions: U.S. contractor installation, standard-quality equipment, a code-compliant feeder, and no major utility-side work.
What the electrician’s subpanel quote usually includes
Quotes vary in what they bundle. A useful estimate separates the panel and breakers, feeder conductors, labor, excavation or conduit, and permit charges. Verify whether the price includes grounding electrodes at the detached structure, branch-circuit connections, inspection corrections, and restoration of disturbed landscaping.
| Quote component | Low | Typical | High | What changes the charge |
|---|---|---|---|---|
| Panel, breakers, and enclosure | $150 | $250-$500 | $800 | Capacity, circuit spaces, outdoor rating |
| Feeder wire and conduit | $200 | $400-$1,000 | $1,800 | Route length, conductor gauge, installation method |
| Electrician labor | $500 | $900-$1,700 | $2,500 | Access, circuit count, troubleshooting, local rates |
| Trenching and backfill | $0 | $300-$1,200 | $2,500 | Distance, soil, obstacles, surface restoration |
| Permit, inspection, and disposal | $50 | $150-$350 | $700 | Municipal fee schedule and project scope |
Material charges may be quoted by the foot, while labor is often billed as a fixed project price or at roughly $75-$150 per hour. The labor portion can include mounting the panel, routing and terminating the feeder, labeling circuits, testing, and coordinating inspection. Ask whether excavation, patching, and permit handling are included rather than assuming they are part of the base price.
How feeder distance, amperage, and trench conditions change cost
Feeder distance is a major cost driver because longer runs require more conductor, conduit, digging, and labor. A route under 25 feet may add only a few hundred dollars when access is easy; a 75- to 100-foot route can add $700-$2,000 or more, especially if it requires underground installation. The route measured along the actual path matters more than the straight-line distance between buildings.
Amperage also affects wire size and equipment. A 60-amp feeder can suit lighting, receptacles, and light-duty tools in many garages. A 100-amp feeder may be appropriate for heavier workshop loads or future equipment, but it can require larger conductors and a check of the home’s service capacity. A 200-amp garage subpanel is less common and should be sized from a load calculation, not selected only for extra spaces.
Ground conditions can change an estimate sharply. Digging in clear soil may cost about $8-$18 per linear foot, while rocky soil, tree roots, or a path beneath a driveway can push excavation and restoration to $25-$50 per foot or more. A route through an existing accessible conduit may reduce digging charges, though the conduit must be suitable and large enough for the conductors.
Panel location and building conditions matter too. An outdoor panel generally needs a weather-rated enclosure, while a long run through finished walls can require more labor than exposed routing. Request a written load calculation and a measured feeder route, particularly when planning a 100-amp panel or adding large tools.
How long installation takes and what labor covers
A straightforward installation with an accessible route may take one electrician about 6-10 hours, often completed in a day. A project involving a long trench, several new garage circuits, difficult wall access, or a service-panel correction may require 1-3 days of work, sometimes spread across separate visits for inspection.
Contractors commonly price the job as a package, but hourly rates provide a useful comparison. Electricians often charge $75-$150 per hour, and a helper or excavation crew may be billed separately. The quote should clarify whether the crew will shut off power to the house, how long any outage may last, and whether a return visit for inspection corrections is covered.
Site preparation can shorten labor time when it is safe and coordinated with the electrician. Clearing stored items near the main panel and proposed garage panel helps, but homeowners should not open energized equipment or perform electrical work to reduce the bill. Expect labor to rise when the feeder route is concealed, the garage is finished, or existing wiring needs correction.
Three garage subpanel estimates with different scopes
These examples illustrate how distance and site work can shift the total; local contractor pricing and code requirements may differ. They assume an existing house panel that can support the added load and do not include a utility service upgrade.
| Project example | Scope and route | Estimated total | Approximate rate |
|---|---|---|---|
| Short, simple run | 60-amp panel, 20 ft of accessible route, three circuits, 6-8 labor hours | $1,300-$2,000 | $65-$100 per route ft, including fixed work |
| Typical workshop | 100-amp panel, 60 ft underground feeder, five circuits, 10-14 labor hours | $2,400-$4,000 | $40-$67 per route ft, including panel and labor |
| Long, obstructed route | 100-amp panel, 100 ft with difficult trenching, six circuits, 16-24 labor hours | $4,500-$7,500 | $45-$75 per route ft, including excavation and equipment |
The per-foot figures are blended project comparisons, not the price of wire alone. Fixed charges for permits, panel installation, and testing make short jobs look more expensive per foot. Compare estimates using the same amperage, route length, circuit count, and trench assumptions.
Regional labor rates and trench pricing across the U.S.
Labor markets and permitting requirements can move the total by roughly 10%-30% compared with a national-style estimate. High-cost metro areas in the Northeast, West Coast, and major cities may run 15%-30% above a typical midrange quote. Smaller towns and lower-cost parts of the South or Midwest may be 10%-20% below it when contractors are readily available.
Those differences are not guaranteed: rural jobs can cost more when an electrician must travel a long distance or schedule specialized excavation equipment. Dense neighborhoods can add costs for traffic control, limited access, or restoration of paved surfaces. Local labor availability and the exact route often matter more than the state average.
For a $2,600 project at a typical rate, a 20% regional premium would mean about $3,120; a 15% discount would mean about $2,210. Treat these as planning adjustments, not firm quotes. Use local bids to set the budget because regional averages cannot account for a particular yard, permit office, or contractor schedule.
When permits, grounding, or service upgrades add fees
Many jurisdictions require an electrical permit and inspection for a new detached-building subpanel. Permit fees commonly range from $50-$500, though some cities charge more or calculate fees by project value. The electrician may include permit handling in the labor price or list it separately; the homeowner should confirm who applies and schedules the inspection.
A detached garage generally needs a code-compliant feeder and grounding arrangement. Existing wiring that lacks a suitable grounding conductor, improper neutral bonding, or an inadequate grounding electrode system can require corrective work. Allow roughly $150-$600 for common grounding or bonding adjustments, with larger corrections priced after inspection of the existing setup.
If the main panel has no capacity or the home’s electrical service cannot support the calculated load, a service or panel upgrade may add $1,500-$4,000 or more. Utility coordination, meter work, and service entrance replacement can push the total higher. Have the electrician check available panel spaces and service capacity before approving a subpanel quote.
Ways to lower the garage subpanel price without undersizing
Choose capacity from expected loads rather than automatically buying the largest panel. An electrician can calculate demand for lighting, receptacles, compressors, welders, EV charging, or other planned equipment. Installing a panel with adequate spaces for reasonable future circuits may be cost-effective, but increasing feeder capacity can raise wire and labor costs even when the panel itself is inexpensive.
Keep the feeder route direct and avoid unnecessary obstacles where site layout allows. If the route crosses a driveway or patio, ask for an alternate path and a separate price for boring versus cutting and replacing the surface. A homeowner may be able to clear access or move stored items before work begins, but any trenching or electrical preparation should be agreed upon with the contractor and comply with local rules.
Get at least three detailed bids that specify panel amperage, conductor material and size, route length, conduit, trenching, grounding, circuit count, permit, and restoration. Compare equal scopes rather than choosing the lowest total without checking exclusions. Scheduling during a contractor’s less-busy period may help with availability, but price reductions are not assured.
Skip unnecessary upgrades such as extra circuits or premium equipment that do not match actual use. Do not cut costs by omitting permits, grounding, or required protection devices. The safest savings come from a shorter practical route, a properly sized design, and a quote that includes the complete inspection-ready scope.