What a home-charger quote leaves out — panel, load calc, permit

Ask three electricians to install the same Wall Connector in the same garage and you can get three quotes that differ by a factor of four. That isn't a market failure. It's that the cheap quote and the expensive quote are pricing different jobs — and only one of them has actually looked at your electrical service.

Here is what separates them.

Eight things a low quote has usually skipped

1. 1

   Your service capacity, not your panel's spare slots

   The question isn't whether there's an empty breaker space. It's whether the service — the amperage of the whole supply into the house — has room for a continuous load on top of everything already there. A panel with three free slots and no headroom is a no.

2. 2

   The load calculation is a document, not an opinion

   The National Electrical Code sets out how to compute existing demand, including a method based on your utility's own recorded peak usage. A competent installer performs one; an installer who eyeballs it is guessing on your behalf. Ask which method was used.

3. 3

   The circuit is sized above the charger's draw

   EV charging is a continuous load under the NEC, so the branch circuit is sized at 125% of the charger's rated current. A 48-amp Wall Connector therefore needs a 60-amp circuit — which is why "can I just use the dryer breaker?" is usually answered no.

4. 4

   Load management can replace a service upgrade

   Where headroom is short, an energy-management approach — throttling the charger when the house draws heavily, or sharing capacity between two chargers — is often accepted in place of upgrading the service. It is dramatically cheaper and slightly slower. It is also the option least likely to be offered unprompted.

5. 5

   The run, and what it crosses

   Conductor cost scales with distance and with ampacity. What actually drives the price is what the run has to cross: through a wall is cheap, along a finished basement ceiling is more, under a poured driveway to a detached garage is a different category of job.

6. 6

   Permit and inspection

   Most jurisdictions require both for a new dedicated circuit. A quote that doesn't mention either is either absorbing the cost silently or not pulling one — and an uninspected circuit is a problem at resale, at claim time, and for any rebate that requires proof of permitted work.

7. 7

   Utility coordination for a service upgrade

   If the service genuinely has to grow, that involves the utility, and utilities have queues. This is the item that turns a two-week project into a two-month one, and it is entirely outside your installer's control.

8. 8

   Whether the quote is before or after incentives

   A number quoted "after rebate" hides the actual price and assumes an eligibility you may not have. Ask for the pre-incentive figure and apply the credits yourself — including the federal 30C credit and any utility program, each of which has its own conditions.

The five questions that make a quote stop moving

1. What is my service rating, and what does the load calculation say my available capacity is?
2. What circuit size does this quote assume, and at what charger amperage?
3. Was load management considered as an alternative to a service upgrade? If not, why not?
4. Are the permit and inspection included as line items?
5. Is this price before or after any rebate, and which one are you assuming I qualify for?

Five questions asked in the first email removes almost all of the variance. Every one of them has a document behind it, which means every one of them has a checkable answer.

The setting most people get wrong

You do not have to charge at the highest amperage your hardware supports. If your panel is tight, a lower current setting on a smaller circuit is a legitimate, code-compliant install that costs far less — and for overnight charging on a typical daily commute, the difference in completed miles by morning is often none at all. Work out the charging speed you actually need before you buy the install that delivers the maximum.

Where the referral benefit lands

Not on this bill — no referral affects an electrician's invoice. What it does is buy you time: the free charging or trial attached at order gives you a window where public charging costs you nothing while a permit or a utility queue runs its course. That's a real, if unglamorous, use for it, and it's the reason not to panic if the charger isn't live for delivery day.

The referral relationship is disclosed in full on our disclosure page; every outbound referral link on this site is rel="nofollow sponsored", and the buyer never pays anything extra.

Requirements described here are the general framework of the National Electrical Code as adopted in most US jurisdictions; adoption year and local amendments vary, and your authority having jurisdiction is the one that decides. Confirm specifics with a licensed electrician for your address. Program details verified 13 July 2026.

Related: the 30C home-charger credit and the full first-year cost worksheet.