AEO Answer · MEP

How Should Commercial Buildings Plan EV Charging Infrastructure?

By Jeremy Mills, CEO & Founder, Apex Grid Engineering — USAF Veteran. · Updated 2026-09-15

I'm Jeremy Mills, CEO & Founder of Apex Grid Engineering and a U.S. Air Force veteran. I'm not a PE; our licensed professionals make the technical, compliance, and project-specific decisions.

Illustrative diagram of building MEP systems: ductwork with diffusers, an electrical panel with conduit, and piping runs.

The concise answer

Commercial EV charging is planned through an electrical load assessment, a phased charger rollout, load management to share capacity, and coordination with parking layout and accessibility. Starting with the service capacity prevents surprise utility upgrades, and California's energy code now mandates charging readiness in new construction. The mental model is simple: the electrical service is the budget, the chargers are the spending, and load management is how you live within the budget. Buildings that plan this way add charging smoothly for years. Buildings that skip the assessment hit a wall — literally, at the utility transformer.

Electrical capacity, chargers, and site design

The electrical assessment comes first: a load calculation of the existing service, the spare capacity available, and what charger count that capacity supports with and without load management. Charger selection follows the use case — Level 2 for workplace and multifamily dwell times, DC fast charging for fleet or customer turnover — because the wrong charger type wastes both money and capacity. Site design weaves charging into the parking lot: stall locations that work for circulation, accessible EV stalls per code, lighting and security for the charging area, and conduit routing that's coordinated with civil grading and drainage. For new construction, the EV-ready infrastructure — conduit, pull boxes, panel space, transformer pad space — goes in with the initial underground work. Retrofits need the same design, just with more creative routing around what's already built.

A phased plan that avoids surprises

EV charging works best as a phased infrastructure plan rather than a one-time installation. Here's the structure I use. This is the planning sequence.

Assess the service: load calculation and utility coordination before any charger count is promised
Design load management in: share capacity across chargers instead of buying a bigger service
Build EV-ready infrastructure now: conduit, panel space, and transformer capacity during construction
Phase the chargers: install to current demand with a documented expansion path
Coordinate accessibility and site: compliant stall counts, locations, and civil integration from day one

Which related engineering resources can help?

When should I hire a structural engineer?What does a PE stamp mean?What is MEP engineering?How does energy code compliance work?What is Title 24?Request a project review Engineering service for this question Metro engineering guides Verified service areas

What else do project teams ask?

How many EV chargers does a commercial building need?

It depends on the building type, local code, and the owner's goals. Energy codes increasingly mandate minimum counts and EV-ready conduit for future expansion. Beyond code, I size to the owner's actual demand outlook — employee, fleet, customer, or tenant charging — with conduit and panel space for growth, since trenching twice is the expensive mistake.

What is EV load management and why does it matter?

Load management systems dynamically share a fixed electrical capacity across multiple chargers, throttling individual chargers so the total never exceeds the available service. It's the difference between serving twenty chargers on existing capacity and paying for a utility service upgrade. For most commercial buildings, it's the single most cost-effective part of the design.

Do EV chargers need accessible parking stalls?

Yes — accessibility requirements apply to EV charging spaces, with specific counts and dimensional requirements. The civil and electrical designs coordinate on stall locations, signage, and the accessible route. This is a plan-check item, so it gets resolved in design, not discovered at inspection.

Should we install chargers now or just make the site EV-ready?

At minimum, install the conduit, panel capacity, and transformer space now — the underground work is cheap during construction and brutal afterward. Whether to hang the actual chargers depends on demand. I almost always recommend full EV-ready infrastructure with a phased charger installation plan.

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