What does an air compressor circuit cost in a NB workshop?

A dedicated air compressor circuit in a New Brunswick workshop typically costs $300–$600, assuming your existing panel has available capacity. If your panel needs an upgrade to accommodate the load, expect to add $2,000–$3,500 to that figure.

The exact cost depends heavily on the compressor you're running. Most residential and light shop compressors (1–3 HP) run on a standard 120V/15A or 20A circuit. Larger compressors — anything 5 HP and up — typically require a 240V dedicated circuit, which involves running heavier wire (usually 10 AWG or 8 AWG for larger motors) and a double-pole breaker. Your electrician will need to know the compressor's nameplate amperage before sizing the circuit — this isn't something to guess at, since undersized wiring is a fire hazard.

Distance from your panel matters a lot. A workshop attached to your home is straightforward. A detached garage or outbuilding means running underground conduit, and in New Brunswick, frost depth can reach 1.2–1.5 metres — your trench needs to account for that. A long run to a detached shop can push costs to $800–$1,500+ depending on distance, conduit type, and whether a subpanel makes more sense than a single circuit run.

TSANB Permit Requirements

Any new circuit in New Brunswick requires a TSANB permit — this isn't optional. Your licensed electrician pulls the permit before work begins, completes the installation, and a TSANB inspector signs off with a Certificate of Compliance. Unpermitted electrical work can void your home insurance and create serious liability if there's ever a fire. For a workshop especially, where you're running high-draw equipment, proper permitting is critical.

Sizing It Right the First Time

One thing worth discussing with your electrician: if you're building out a workshop, consider installing a subpanel rather than running individual circuits for each tool. A 60A or 100A subpanel in the shop gives you room to add circuits for a table saw, dust collector, lighting, and future tools without running back to the main panel each time. The upfront cost is higher ($800–$1,500 for the subpanel), but it's almost always the smarter long-term investment for a serious workshop.

Never run a large compressor on an extension cord or an undersized circuit — motor startup draws 3–5x the running amperage, and that surge on an inadequate circuit is exactly how breakers fail, wiring overheats, and fires start.

If you're ready to get this done right, New Brunswick Electrical can match you with a licensed local electrician for a free estimate — just let us know your location and what you're working with.