What should an EV charger site assessment include?

Panel capacity (actual load, not just nameplate), available breaker slots, physical run path inspection, local code and GFCI requirements, permit availability and lead time, and for commercial projects, a utility coordination assessment. A thorough assessment prevents every category of post-contract surprise.

How long does an EV charger site assessment take?

A residential assessment typically takes 20–45 minutes when done properly. Commercial assessments are longer and may require a return visit with an engineer. The time invested at assessment is always less than the time lost to a mid-project scope change.

What is a double-tapped circuit and why does it matter for EV charger installation?

A double-tapped circuit is one where two wires are connected to a single breaker terminal not rated for it — a code violation and a load management issue. It affects how much capacity is actually available and must be resolved before adding a high-draw circuit like a Level 2 charger.

Can I install an EV charger without a permit?

Technically possible; never advisable. An unpermitted installation may void the homeowner's insurance coverage for EV-related incidents, disqualify the installation for the federal 30% tax credit, and create liability for the installer. Permits protect everyone.

EV Charger Site Assessment Pitfalls: Mistakes Installers Make (2026)

A site assessment isn't the preliminary to the job — it is the job. Every callback, re-quote, and schedule blow-up I've seen in this industry traces back to something that should have been caught at assessment. Here are the pitfalls I see repeatedly, and the habits that eliminate them.

Quick Answer

Quoting a job without physically walking the wire run, missing panel capacity or double-tap issues, overlooking utility interconnection requirements for commercial jobs, and failing to account for permit lead times. Each of these inflates the final cost, delays the project, or produces a callback — and all of them are preventable with a methodical assessment.

Pitfall 1: Quoting Without Walking the Run

The most expensive sentence in this industry is 'the run looked straightforward.' A homeowner describes a garage adjacent to the house; what they haven't mentioned is the finished basement in between, the HVAC unit blocking the obvious conduit path, and the fact that 'adjacent' means sixty feet of exposed exterior wall. Walking the run yourself — before you price the labor — is not optional. It's where your quote either holds or falls apart.

Pitfall 2: Trusting the Panel Label

A 200-amp panel on the label and a 200-amp panel in practice are not the same thing. Older panels may have derated components, corroded bus bars, or a load profile that leaves far less headroom than the nameplate suggests. I assess actual load — not just available slots — on every job. A homeowner requesting a 48-amp Level 2 charger on a panel already running at 80% capacity needs an honest conversation, not a circuit breaker.

What to Check	Why It Matters	Common Finding
Service amperage (actual vs. labeled)	Determines max charger level	Derated or 100A in older homes
Available breaker slots	Physical space for new circuit	Full panels with no open slots
Double-tapped circuits	Load and code violation risk	More common than expected
Aluminum branch wiring	Requires special connectors/breakers	Pre-1972 homes especially
Bus bar and neutral bar condition	Corrosion limits capacity	Coastal and older construction

Pitfall 3: Overlooking Outdoor and Garage Code Requirements

EVSE in garages, carports, and outdoor locations triggers GFCI protection requirements, wet-location-rated outlet requirements, and in some jurisdictions specific conduit fill and mounting height rules. Installers who treat a garage install as identical to an interior run create code violations that surface at inspection — and become the installer's problem to fix on their own dime.

Local Code Trumps General Knowledge

NEC sets the floor; local amendments raise it. A Texas install may have specific requirements that differ from the same job in California or New York. Pulling the permit and confirming AHJ (Authority Having Jurisdiction) requirements before any work starts is the only way to know what you're actually building to.

Pitfall 4: Ignoring Utility Coordination on Commercial Jobs

Commercial EV installations — fleet charging depots, multifamily buildings, retail parking — routinely require utility coordination that residential jobs don't. If the available service capacity doesn't support the planned charger load, the utility gets involved before a single breaker is pulled. Installers who quote commercial projects without a load study create contracts they cannot honor.

Commercial installs range $8,000–$100,000 in part because utility work, engineering, and inspections are real line items. Customers who receive accurate scoping upfront don't become difficult customers — they become repeat customers.

Pitfall 5: Underestimating Permit Timelines

Permit timelines vary dramatically by jurisdiction — from same-week approvals in some Texas counties to six-week backlogs in high-demand urban areas. Installers who promise a start date without confirming permit lead time are promising something they don't control. The conversation about permit timelines belongs at assessment, not after the customer has already arranged to be home.

Walk the physical wire run before pricing any job — no exceptions
Assess actual panel load, not just available slots or nameplate rating
Confirm local AHJ code requirements before finalizing scope
Check GFCI, wet-location, and conduit requirements for garage and outdoor installs
Confirm permit lead time with the local AHJ before committing to a start date
For commercial projects, require a load study before finalizing contract

Common EV Charger Site Assessment Pitfalls (And How to Avoid Them)

The Short Answer