What's the cost to run a 240-volt circuit for a workshop in my Calgary garage?

Running a 240-volt circuit to a Calgary garage workshop typically costs between $500 and $1,500 depending on the amperage required, the distance from the panel, and whether the circuit runs to an attached or detached garage. This is one of the most popular electrical upgrades for Calgary homeowners with serious workshop setups — table saws, welders, air compressors, and other heavy equipment need 240-volt power to operate properly.

The cost depends primarily on what equipment you plan to run, which determines the amperage and wire gauge. A 30-amp, 240-volt circuit (suitable for most table saws, planers, and moderate-duty equipment) uses 10/3 NMD90 wire and a two-pole 30-amp breaker, typically costing $500 to $900 installed for an attached garage with a short run from the panel. A 50-amp, 240-volt circuit (needed for welders, large air compressors, and heavy-duty equipment) uses 6/3 wire and a two-pole 50-amp breaker, running $700 to $1,200 for an attached garage. If you need multiple 240-volt outlets or a sub-panel in the garage to serve several pieces of equipment, the cost rises to $1,200 to $2,500 for a 60-amp or 100-amp sub-panel with dedicated circuits.

Detached garages add significant cost because the wire must be run underground or overhead between the house and garage. Underground is the standard approach in Calgary — the wire (typically TECK cable at $2.50 to $9.00 per foot) must be buried below frost depth, which exceeds 1.2 metres in the Calgary area. Trenching, conduit, backfill, and the longer wire run can add $1,000 to $3,000 to the project depending on distance. For detached garages more than 15 to 20 metres from the house, a sub-panel in the garage is almost always the most practical approach.

Before your electrician runs the new circuit, they will assess your panel capacity. A 240-volt, 50-amp circuit draws significantly from your home's electrical service — if you have a 100-amp panel that is already loaded with central air, electric hot water, a dryer, and daily household use, there may not be enough capacity. Your electrician will perform a load calculation to determine whether a panel upgrade to 200 amps is needed first, which adds $1,800 to $4,500 to the project.

The outlet type matters for workshop use. The most common 240-volt workshop receptacles are the NEMA 6-30 (30-amp, 240V) and NEMA 6-50 (50-amp, 240V) for pure 240-volt equipment, or NEMA 14-30 and NEMA 14-50 for equipment that needs both 240V and 120V (four-prong outlets). Discuss your specific equipment with your electrician so the correct outlet type is installed. Many experienced workshop users also request a NEMA 14-50 outlet for future flexibility — it can power a welder today and an EV charger tomorrow.

Calgary's cold winters create a specific consideration for garage workshops. If you heat your garage workshop with a 240-volt garage heater (a common setup drawing 4,000 to 5,000 watts), it needs its own dedicated circuit separate from your workshop equipment circuit. Running a table saw and a garage heater on the same circuit will trip the breaker. Plan for at least two 240-volt circuits if you intend to heat and work simultaneously.

An electrical permit is required from the City of Calgary for any new 240-volt circuit. Your licensed electrician handles the permit and coordinates the Safety Codes Officer inspection. Verify WCB Alberta coverage before work begins — this is particularly important for garage workshop installations where the electrician may be working in confined spaces. Calgary Electrical Services can match you with licensed electricians experienced in workshop electrical installations.