200A to 400A Panel Upgrade Cost in Calgary

400A Service Upgrade — Scope comparison

Multiple EVs, a workshop or a suite may prompt a review of service demand, but none automatically requires 400A. Ask for an accepted load calculation and compare load management, separate distribution and a larger service before specifying equipment.

The serving utility must assess connection feasibility, including its supply-side equipment and metering requirements. Ask which party owns and pays for any service drop, transformer, underground work or meter changes at this address.

When should 400A be considered?

Compare calculated demand with the documented existing service. Multiple EV chargers may be coordinated through listed load-management equipment, while other properties need supply-side changes. Neither the number of chargers nor the panel label proves the right service size.

For shops, document each machine's nameplate, starting demand, feeder route and phase requirements. Three-phase availability is a utility feasibility question, not a feature guaranteed by installing a different panel.

For suites, document tenancy and metering as well as demand. Ask the permit holder whether a shared or separate service is proposed and who approves the arrangement; suite status alone does not set the amperage.