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This calculator vs. a flat hang fee
"$1,200 to install an EV charger" is not a price for a job — it is a price for whatever circuit the fee happened to be built on, quietly applied to every driveway that also asks for a Level 2 charger.
What a flat hang fee is
A flat hang fee is the fastest way to quote a charger install over the phone: ask the charger's amperage, quote a number, skip the walkthrough. Homeowners shop it because a search result or a Facebook ad already gave them a number, and it is the number they will ask you to match.
The number behind it was set for one kind of job — usually a short indoor or attached-garage run to a panel with a spare breaker slot and plenty of service headroom — and then reused for every driveway afterward, whether or not the next one needs a trench, a longer run, or a panel that is already full.
What this calculator is
This page keeps no account and sends nothing to a server. You enter the charger's continuous amps, the install type, the one-way run and any trench footage, the mounting location, the panel work, and the existing service amps and estimated existing load, plus your own wage, payroll burden, overhead, permit fee, and target margin. It sizes the breaker at 125% of the continuous load, recommends copper that holds a 3% voltage drop over the actual run, flags a panel with no headroom for the new circuit, and returns the bid price, the effective hourly rate, and the walk-away price below which the job loses money — for this run and this panel, not a flat number for every driveway.
| What a flat hang fee does | What this calculator does instead |
|---|---|
| Charges the same fee for a 25-foot indoor hang and a 70-foot trench to a detached garage — even though the trench job alone can need a full day more of labor. | Prices the run and any trench footage separately, at minutes per foot for the run and hours plus restoration dollars per foot for the trench. |
| Has no line for a service upgrade, a subpanel, or a relocate, regardless of whether the existing panel has headroom for the new breaker. | Sizes the required breaker at 125% of the charger's continuous amps and flags when the existing service has no headroom for it, before you commit to a price. |
| Quotes the same copper for a 20-foot run and a 150-foot run, with no check against voltage drop. | Recommends the smallest copper conductor that carries the breaker and holds a 3% voltage-drop budget over the actual run, upsizing automatically on long pulls. |
| Has no separate line for an outdoor disconnect, a driveway pedestal, or a NEMA 14-50 receptacle instead of a hardwired unit. | Prices outdoor disconnects, pedestal hardware, and receptacle devices as their own material and labor lines when the job calls for them. |
| Gives the estimator a number to quote, not a number to check a quote against. | Reports the walk-away price and the dollar gap against what a flat hang fee would have quoted the same job, so a shopped price can be scored against real cost before you commit to it. |
Two driveways, one flat fee
Using this calculator's own shipped starting example:
A 25-foot indoor hardwired hang for a 48 A charger, on a spare breaker slot with headroom on the existing 200 A service, prices at $1,263.36, on a job that costs $947.52 to run.
Take the same 48 A charger to a detached garage instead — a 70-foot run through a 60-foot trench, with a panel that also needs a 200 A service upgrade — and the job costs $3,439.95 to run before a dollar of profit, and this calculator bids it at $4,586.61: 3.6 times the easy job, on the identical charger. Quoting the trench-and-upgrade job at the easy job's flat $1,263.36 fee prices it $2,176.59 below its own break-even cost — before counting the $3,323.25 it falls short of this calculator's own bid price at a 25% target margin. Same charger, same flat fee, one driveway that pays and one that loses money the moment the trench is dug.
Common questions
Why does a flat hang fee get an EV charger install wrong?
Because the cost driver is the circuit, not the charger. A 25-foot indoor run to a panel with a spare breaker slot needs a short copper pull and about half an hour of panel work. A 70-foot trench to a detached garage that also needs a 200 A service upgrade needs a full day of trench and panel labor, restoration, and a much larger material bill, on the same charger. A flat hang fee charges both the same because it was priced on the charger, not the circuit.
What does a flat hang fee usually leave out entirely?
The run, the trench, and the panel. A flat fee has no line for a 125%-continuous-load breaker sized off the charger's actual amps, no line for copper upsized to hold a 3% voltage drop over a long run, no line for trench footage or restoration, and no line for panel work heavier than a spare slot -- a relocate, a subpanel, or a full service upgrade.
How big is the pricing gap in practice?
On this calculator's own shipped starting example: a 25-foot indoor hardwired hang for a 48 A charger, on a spare breaker slot with headroom on the existing 200 A service, prices at $1,263.36. The same 48 A charger over a 70-foot run through a 60-foot trench to a detached garage that also needs a 200 A service upgrade prices at $4,586.61 -- 3.6 times the easy job. Quoting the trench-and-upgrade job at the easy job's $1,263.36 flat fee prices it $2,176.59 below its own $3,439.95 break-even cost, before a dollar of profit or the crew's time is covered.
Is a flat hang fee ever the right way to quote?
For a narrow band of similar jobs -- an indoor or attached-garage run to a panel with a spare slot and headroom on the service -- a flat fee can land close, because that is probably the job the fee was set on. The risk is quoting a detached-garage trench or a tight panel the same way sight unseen, because the fee does not know the run length, the trench, or the panel's headroom until someone measures the house, and by then the flat number has often already been quoted.
Does this calculator know my local labor rates or material costs?
No. It has no data on your local labor market, your supplier's copper and breaker pricing, or your permit fees. It takes the charger amps, the run, the trench footage, the mounting location, the panel work, and the existing service and load, plus your own wage, burden, overhead, permit, and target margin, and turns that into a price for this job -- the arithmetic a flat hang fee skips, not a market survey.
Open the EV Charger Install Bid Calculator to price your own job, or read how much you should charge to install an EV charger.