Can I Install an EV Charger in My Garage?
For most Boise and Treasure Valley homeowners, yes. The install is usually straightforward in newer homes. Here's what determines how involved the job gets.
Yes, installing an EV charger in your Boise garage is something most homeowners can do without major complications. Attached garages are the easiest scenario: a half-day job for a licensed electrician in most cases. Detached garages, older homes with undersized panels, or long conduit runs push the complexity and cost up, but none of those are reasons it can't be done.
Attached vs. Detached Garage
Attached garages are usually fast. The main panel is often on an interior wall nearby, so running a dedicated 240V circuit to the garage wall takes 2 to 4 hours. The Treasure Valley's newer housing stock, most of Meridian, Eagle, and Star subdivisions built in the 2000s onward, is well-suited for this.
Detached garages require more planning. The electrician runs conduit underground from the main panel or installs a subpanel in the detached structure. Both approaches work well for Boise's climate and soil. The trenching adds time and cost, typically $500 to $1,500 more than a simple attached garage install, depending on the run length.
A lot of older Boise properties, particularly in the North End, Bench area, and East End, have detached garages or converted carriage structures. These jobs are common enough that Boise electricians handle them regularly.
Panel Capacity
A Level 2 charger requires a dedicated 240V, 50-amp circuit. Your panel needs an open slot for the new breaker and enough available amperage. Most homes with 200-amp service and reasonable loads are fine. Older Boise homes, especially in the North End and parts of the Bench built before 1980, sometimes have 100-amp panels that are at or near capacity.
If your panel can't support the additional load, two options:
- Panel upgrade: Replace the 100-amp panel with 200-amp service. Cost in Boise runs $1,200 to $2,500. Adds capacity for the EV charger and any other future additions.
- Load management device: A smart controller that limits the charger's draw when other large appliances run. Costs $200 to $400 and avoids the panel upgrade, but the charger won't always run at full output.
See the panel upgrade guide for how to know which situation you're in.
Idaho Permit Requirements
Idaho requires an electrical permit for Level 2 EV charger installation. Boise permits go through the City of Boise Building Department. Your licensed electrician handles the permit before work starts and schedules the inspection afterward.
The permit also matters for the Idaho Power rebate. Idaho Power offers $200 back on qualifying Level 2 installations. Verify current requirements at idahopower.com before purchasing. A properly permitted install is part of the documentation package for the rebate.
Garage-Specific Notes
Charger placement
Figure out where to mount the charger before the electrician starts. You want it within cord reach of the car's charge port, most EV cables are 18 to 25 feet. Side walls near the front of the parking spot usually work well for nose-in parking. The back wall works for reverse-in.
Outdoor-rated charger for open structures
A standard enclosed garage is fine with most chargers. If your garage has open or unfinished walls, or if it's a pole structure or open carport, choose an outdoor-rated (NEMA 4) charger. Boise's dry climate is gentler on electronics than the Pacific Northwest, but temperature swings between summer and winter still matter.
Idaho Power TOU rate
While you're getting the charger installed, ask your electrician about Idaho Power's Time of Day rate plan. It offers lower rates after 9 PM on weekdays and all day Sundays and holidays, exactly when most people charge overnight. A smart charger paired with the TOU plan can meaningfully reduce your monthly charging cost.
Frequently Asked Questions
You can, but Level 1 charging is slow: 3 to 5 miles of range per hour. For daily Treasure Valley driving, that often isn't enough to reliably recover overnight. Most people who try Level 1 for a few weeks switch to Level 2 quickly.
Both are code-compliant. A 14-50 outlet lets you swap chargers later without any rewiring. A hardwired install is slightly cleaner and one less point of connection. Many Treasure Valley electricians offer both. Ask during the quote which they prefer and why.
Labor for a straightforward attached garage install typically runs $300 to $600, not including the charger. Detached garages and panel upgrades cost more. See the full cost guide for Boise-area pricing.
Most of Ada and Canyon counties, including Meridian, Nampa, Caldwell, Eagle, and Star, are Idaho Power territory. Check your electricity bill to confirm. If it says Idaho Power, you qualify for their rebate regardless of which Treasure Valley city you're in.
Want the full picture from start to finish? See our complete installation roadmap.