What is EV charging infrastructure and what does California require?

EV charging infrastructure is the wiring, conduit, panel capacity, and physical space provided so an electric vehicle charger can be installed at the ADU — now or in the future. California's energy code requires new residential construction, including ADUs, to provide for EV charging on the electrical plans, and many local reach codes go further.

The three levels of requirement

Jurisdictions land at different points along a spectrum, so it's important to know which one applies to you:

What it means for the panel

A Level 2 charger operates at 240V and typically requires a 40–50A dedicated circuit. That's a meaningful load: the Article 220 calculation must include it at full rated load, which is one of the reasons all-electric ADUs with EV charging trend toward 150–200A service. Reserving the breaker space and sizing the panel for it up front avoids having to re-pull the load calc and upgrade later.

Why you install it during construction

• During construction: roughly $500–$1,500 to run conduit and reserve capacity while walls are open.
• As a retrofit: typically $2,000–$5,000 once walls are closed and finishes are in.

Running conduit and reserving a breaker while the framing is exposed is almost always the cheaper, cleaner choice — and missing EV infrastructure on the plans is a frequent plan-check correction in California. Beyond the cost difference, retrofitting risks running out of panel capacity: if the load calc was done without the EV charger, adding 40–50A later can force a panel or even a service upgrade that a little foresight would have avoided.

Plan-set checklist for EV infrastructure

• Reserved two-pole breaker space shown on the panel schedule.
• Conduit routed from the panel to the designated charging location (garage wall, carport, or driveway-adjacent exterior wall).
• The EV load included at full rating in the Article 220 calculation if EV-capable or installed.
• The charging location coordinated with the architectural plans so it doesn't conflict with parking or doors.

Our electrical plans show the EV conduit run, the designated charging location, and the reserved circuit so it clears plan check the first time. Requirements vary by jurisdiction — confirm whether your city requires EV-ready, EV-capable, or an installed charger with your local building department.