How to Estimate an EV Charger Installation

More homeowners are asking for a charger in the garage. It looks like an easy job, one circuit and a unit on the wall, but skip the panel check, misjudge the wire run, or forget the permit and the estimate falls apart. This guide gives you a repeatable way to price a Level 2 charger install with numbers you can stand behind.

Important: this work must be done by a licensed electrician following the NEC (National Electrical Code) and the local code your jurisdiction has adopted. This guide covers how to estimate the job. It does not replace the code or the manufacturer's installation instructions.

What a Level 2 Charger Is

A Level 2 charger runs on 240 volts and charges much faster than a standard 120 volt receptacle (Level 1). Residential units come in several current ratings, for example 32, 40, or 48 amps, and many let you set the maximum current at install. Before you price anything, get the make and model of the charger, or decide which one you will supply.

Step 1: Load Calculation and Panel Capacity

This is the step that gets skipped most often, and the one that causes the most trouble.

1. Check the service: note the service and main panel rating (for example 100 A or 200 A) and the panel's condition.
2. Run the load calc: use the NEC dwelling method (Article 220) and account for existing loads: electric range, dryer, water heater, air conditioning, heat pump, and anything else. That tells you whether the service can carry the charger's continuous load.
3. Find panel space: the charger needs a two pole breaker. Confirm you have the spaces and that the breaker is listed for that panel.

If the numbers do not work, you have three options: turn down the charger's configured current, use a code compliant load management system, or price a panel or service upgrade.

Step 2: Dedicated Circuit and Breaker

The charger goes on a dedicated circuit with no other loads. The NEC treats EV charging as a continuous load, so the circuit is sized at 125% of the charger's maximum current. For example:

• 32 A charger: 40 A circuit.
• 40 A charger: 50 A circuit.
• 48 A charger: 60 A circuit, typically hardwired.

Always follow the manufacturer's specs, which list the required breaker and conductor for each setting.

Step 3: Wire Run and Conduit

Measure the actual route from the panel to the mounting location, not the straight line distance. Count the rises, drops, turns, and any trip through walls or the attic.

• Conductor size: sized from NEC ampacity tables based on cable type, terminal temperature rating, and voltage drop. On long runs it may make sense to upsize.
• Raceway: in finished garages NM cable may be allowed where code permits. Exposed, exterior, or underground runs go in conduit such as EMT or PVC, buried at the depth code requires.
• Detached garage or exterior pedestal: add trenching, conduit, boxes, sealing, and any landscape restoration.

All of this prices out in linear feet, and it is where cost swings the most from one house to the next.

Step 4: Hardwired vs NEMA 14-50 Outlet

• Hardwired: the charger connects directly to the circuit. You get the unit's full capacity, such as 48 A, with no receptacle to wear out.
• NEMA 14-50 outlet: works for plug-in chargers. A 50 A circuit with this receptacle limits continuous charging to 40 A. Use a heavy duty receptacle. Check whether the NEC edition your jurisdiction adopted requires GFCI protection for that receptacle in a garage or outdoors, and price the right breaker.

Step 5: Permits, Inspection, and Panel Upgrades

Most jurisdictions require an electrical permit and inspection for this work. Include:

• The permit fee.
• Time to pull the permit.
• The inspection visit.

If the panel or service needs an upgrade, price it as a separate line item. It is a different scope, it may require coordination with the utility, and it changes the total completely. A separate line shows the homeowner exactly why the price went up.

Also mention that some utilities and state programs offer rebates or special rates for home chargers. Encourage the homeowner to check the requirements before buying equipment, without promising any amount.

Step 6: Labor

Break hours out by phase: site visit and load calc, breaker install, conduit and wire run, mounting and terminating the charger, testing and setup, and the inspection visit. Multiply by your electrician's fully burdened hourly rate, including payroll taxes and insurance.

Overhead and Profit

Add up direct costs (material, labor, permit), then add your overhead share (insurance, trucks, licensing, office, software). Then price for margin:

Price = total cost / (1 - desired margin)

Adding 30% to cost does not get you a 30% margin. It gets you about 23%. Use the formula.

Sample Estimate

These numbers are an example only. Material, permit, and labor costs vary by region, jurisdiction, and season.

A 40 A hardwired charger in an attached garage on a 50 A circuit, 45 ft run in EMT, 200 A panel with capacity and space confirmed. The homeowner supplies the charger.

• 50 A two pole breaker: $60.
• Conductors, conduit, fittings, straps, and boxes: $290.
• Total material: $350.
• Electrical permit: $150.
• Labor: 6 hours install plus 1 hour for inspection = 7 hours x $85 = $595.
• Direct cost: $1,095. Allocated overhead: $200. Total cost: $1,295.
• At a 30% margin: $1,295 / 0.70 = $1,850.

Good, Better, Best Options

• Good: NEMA 14-50 outlet on a dedicated 50 A circuit, with the protection code requires, for the homeowner's portable charger.
• Better: 40 A hardwired charger on a 50 A circuit, installed and configured.
• Best: 48 A hardwired charger on a 60 A circuit with smart or load management features, plus conduit ready for a second charger down the road.

Common Mistakes

• Pricing the job without a load calculation.
• Measuring a straight line and coming up short on wire and conduit.
• Putting a 48 A charger on a NEMA 14-50 outlet.
• Burying a panel upgrade inside the price without explaining it.
• Forgetting the permit and the inspection trip.

How RoofDesk Helps

RoofDesk includes the electrical trade. Capture measurements on site, like the run in linear feet, and build the proposal from trade templates with units by LF, each, or fixed price, plus good, better, and best options with scope in English or Spanish. A panel upgrade can go in as its own line. The homeowner accepts and signs from their phone, and if something changes on the job you send a change order with a digital signature. Log expenses with a photo of the receipt, track cost, overhead, and profit per job, and collect the deposit by card from the invoice link.

Frequently Asked Questions

Does every EV charger install need a panel upgrade?

No. Many homes have enough capacity, and the NEC load calculation tells you. If it falls short, see the options in Step 1.

Is hardwired or a NEMA 14-50 outlet better?

Hardwired lets the charger use its full capacity and avoids receptacle wear. A NEMA 14-50 gives flexibility for portable chargers but limits continuous charging to 40 A on a 50 A circuit.

Do I need a permit to install an EV charger?

In most jurisdictions, yes, along with an inspection. Check local requirements and build them into your price.

Estimate With a Process, Not Surprises

To see how to build electrical proposals with options, digital signatures, and job costing in one place, book a RoofDesk demo.