What's involved in running electrical to a detached workshop on acreage 150 feet from the main house?

Running electrical to a detached workshop 150 feet from your house requires careful planning for trenching, proper wire sizing, and multiple permits and inspections through Alberta's Safety Codes system.

For a 150-foot run to a workshop, you'll need to install underground electrical service, which involves several critical components. The wire sizing depends on your workshop's electrical needs — a basic 100-amp service requires 1/0 AWG aluminum wire or 2/0 copper, while a 60-amp service can use 6 AWG aluminum. At 150 feet, voltage drop becomes a significant factor, so your electrician may need to upsize the wire to maintain proper voltage at the workshop.

The trenching and burial depth must meet Alberta Building Code requirements — electrical cables must be buried at least 18 inches deep in most soil conditions, or 24 inches if crossing under driveways or areas with vehicle traffic. In Greater Calgary's expansive clay soils, proper trenching is crucial because the clay's freeze-thaw cycles can shift and damage improperly installed cables. Many contractors recommend going deeper (24-30 inches) for added protection against frost heaving.

Electrical permits and inspections are mandatory through the City of Calgary. Your licensed electrician must pull an electrical permit before starting work, and the installation requires multiple inspections: rough-in inspection (before backfilling the trench) and final inspection (after connecting to both the main panel and workshop subpanel). The main house may need a panel upgrade if your existing service doesn't have capacity for the additional load — many older homes have 100-amp services that need upgrading to 200-amp for workshop additions.

The workshop subpanel installation requires proper grounding and bonding. On acreage properties, grounding can be more complex than urban installations — your electrician may need to install ground rods at the workshop location and ensure proper bonding back to the main house ground system. The subpanel must be sized appropriately for your workshop needs: lighting, outlets, 240V for welders or large tools, and potentially electric heat.

Calgary-specific considerations include dealing with the region's extreme temperature swings and chinook conditions. Underground cables experience less stress than overhead lines, but proper installation in Calgary's clay soils requires attention to drainage and frost protection. The 150-foot distance also means you're likely dealing with Rocky View County or other municipal jurisdictions outside Calgary city limits, each with their own permit processes and inspection requirements.

Professional requirements are non-negotiable — all electrical work must be performed by a licensed electrician and inspected by accredited Safety Codes Officers. Attempting DIY electrical work violates Alberta safety codes and will void your insurance coverage. Expect costs of $8,000-$15,000 for a complete 100-amp service installation at 150 feet, including trenching, wire, panels, permits, and labor. Factors affecting price include soil conditions, existing panel capacity, workshop electrical requirements, and accessibility for trenching equipment.

Next steps: Contact a licensed electrician for a site assessment to determine your workshop's electrical needs, evaluate your main panel capacity, and provide accurate pricing for your specific soil and site conditions.

---

Find a Electrical Contractor

Calgary Construction Network connects you with experienced contractors in the directory:

• Riverstone Electric Inc ✓
• Durable Decks ✓
• Red Seal Inspections ✓