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Underground Wiring

Safe, Reliable Underground Wiring for Additions, Garages & Outbuildings

When you add a garage, shed, workshop, or outbuilding, you need power that’s safe, stable, and built to last, and properly engineered for long-term reliability. Underground wiring is the cleanest, safest way to bring electricity to new structures, but it has to be installed correctly.

Underground wiring isn’t just burying a cable, it’s designing a safe, code-compliant electrical path that protects against moisture, soil movement, and Wisconsin freeze conditions.

Homeowners across La Crosse, Eau Claire, and Wausau trust Olson Brothers Electric for underground wiring that meets code, protects against moisture and damage, and stays reliable for years.
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Underground Wiring Includes:

Every property is different, so underground wiring requires careful planning and route design. Our service includes:
  • Evaluating your electrical panel capacity
  • Planning the safest wiring route
  • Digging or trenching to required code depth
  • Installing conduit or direct-burial cable
  • Running wiring to garages, sheds, additions, or outbuildings
  • Adding dedicated circuits or subpanels when needed
  • Installing outlets, lighting, and switches in the new space
  • Connecting HVAC, EV chargers, or shop equipment
  • Ensuring grounding and surge protection
  • Full testing and code-compliance checks
Everything is installed with long-term safety in mind, including moisture exposure, soil movement, and Wisconsin freeze cycles.

You Need This Service If…

  • You’re adding a detached garage, pole barn, or workshop
  • You’re building a shed that needs power
  • You’re adding lighting, outlets, or powered systems to an outbuilding
  • You’re installing an EV charger in a detached garage
  • Your existing underground wiring has failed or been damaged
  • You’re renovating or expanding your home
  • You’re upgrading outdoor lighting or security systems
  • You want a cleaner look without overhead electrical lines
Underground installation keeps wiring hidden, protected, and much safer than overhead options.
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What Olson Brothers Electric Does

Evaluate Your Power Needs and Panel Capacity

We determine whether your existing panel can support additional circuits. Some projects, especially those involving workshops or EV charging, may require a panel service upgrade

Plan a Safe, Code-Compliant Wiring Route

We map the layout of the property, utilities, and structures to choose a route that’s safe and efficient.

Trenching or Boring for Underground Conduit

We dig to the correct depth required by Wisconsin electrical code. In some cases, we use underground boring to avoid disturbing landscaping, driveways, or hardscaping.

Install Conduit or Direct-Burial Cable

Most projects use conduit for maximum protection, but certain installations qualify for rated direct-bury cable when appropriate.

Install Wiring, Circuits & Termination Points

We run dedicated wiring to the new structure and install:

  • Outlets
  • Switches
  • Lighting
  • Exterior fixtures
  • Subpanels (if needed)
  • Dedicated circuits for equipment or appliances

Final Testing and Safety Checks

We test grounding, load, circuit operation, GFCI protection, and continuity to make sure everything works exactly as it should.

Why Underground Wiring Matters

Correctly installed underground wiring:
  • Protects against weather and physical damage
  • Keeps wiring hidden for a cleaner look
  • Provides safe power to additions and outbuildings
  • Reduces risk of electrical faults
  • Ensures reliable performance even in harsh Wisconsin winters
  • Supports EV charging, HVAC systems, and heavy shop equipment
  • Meets modern code requirements
  • Adds long-term value to your property
Bad underground wiring can lead to shock hazards, outages, and expensive repairs — which is why professional installation is essential.

Why Homeowners Around La Crosse, Eau Claire, and Wausau Choose Olson Brothers Electric

Homeowners throughout Onalaska, La Crosse, Holmen, West Salem, French Island, Eau Claire, Wausau, and nearby communities call us for underground wiring because:

We Know Wisconsin Ground Conditions

Soil, frost depth, and terrain all affect underground wiring safety. We account for all of it.

Precision Trenching and Clean Installations

We use the right equipment, trench cleanly, and bury everything at the correct depth using durable, code-approved materials.

Code-Compliant Work from Licensed Electricians

Underground wiring is heavily regulated, we make sure every detail passes inspection.

Future-Proofed Wiring

We plan wiring that supports today’s needs and tomorrow’s additions.

Local Experts You Can Reach Anytime

We’re close by and ready to help before, during, and after your project.

Power Your Outdoor Spaces Safely
and Dependably

Underground wiring ensures your garages, additions, and outbuildings get the safe, stable power they need. Olson Brothers Electric installs underground systems built for long-term performance.

Bring safe, reliable power to your additions, sheds, and outbuildings get the safe, stable power they need, without the hazards of overhead lines.

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FAQs About Underground Wiring

How deep does underground wiring need to be buried?

It depends on the installation type, but most underground conduit must be buried 18–24 inches deep. We follow all Wisconsin electrical codes.

Do I need a subpanel in my garage or outbuilding?

If you plan to run multiple circuits, heavy equipment, or EV chargers, a subpanel is often recommended. We’ll evaluate your needs.

Can you run power to an existing shed or garage?

Yes. We regularly add power to existing structures.

Is underground wiring better than overhead wiring?

For most homeowners, yes, it’s safer, more durable, and visually cleaner.

Can you repair existing underground wiring?

Yes. If wiring was installed incorrectly or damaged, we can evaluate and repair or replace it.