A garage subpanel quote may stop at an empty panel: receptacles, lighting and the EV charger circuit can cost extra. The examples below total $2,000 for a nearby garage and $5,500 for a longer detached-building route. Both are hypothetical budgets, not 60A-versus-100A market prices. The wiring route and included branch circuits explain the difference.
This guide focuses on U.S. residential garages and workshops. The budgets are hypothetical planning examples, not a verified market average for 2026. A licensed electrician should verify the source panel, conductor route, grounding and local permit requirements before you choose a feeder size.
60A vs 100A Subpanel: Which Is Right?
| Design topic | 60A subpanel | 100A subpanel |
|---|---|---|
| Typical goal | Moderate garage circuits | Larger workshop or future circuits |
| Feeder capacity | Less | More |
| Feeder materials | Often lower cost | Can require larger conductors and conduit |
| Main service capacity added | None | None |
| Design requirement | Calculated load and compliant feeder | Calculated load and compliant feeder |
A 100A subpanel is not automatically preferable just because it has a higher number. If the main service is already near its calculated limit, installing a larger downstream panel does not create energy or allow unrestricted additional load.
What a Garage Subpanel Budget Should Include
- Subpanel enclosure, breakers and compatible protection
- Feeder conductors, conduit, fittings and support
- Breaker or other appropriate overcurrent protection at the source
- Labor to route cable through accessible or finished surfaces
- Detached-building grounding and bonding work when required
- Permit, inspection, labeling and restoration
Ask whether the subpanel price includes actual branch circuits to the EV charger, workshop receptacles or lighting. Some proposals only cover the new feeder and empty panel; the garage wiring itself may be a separate job.
What older subpanel prices leave out
An older U.S. consumer installation guide (April 2023) lists approximately $400–$600 for a simple 50–60A subpanel and $500–$1,500 for a 100–125A subpanel, labor and materials included under its described work scope. These historical reference prices must not be presented as current 2026 quotes, and they do not necessarily include a long detached-garage feeder, driveway trenching or added branch circuits.
The two hypothetical budgets below instead compare simple nearby installation against complex detached-building work. They do not prove that a 100A panel always costs more than a 60A panel.
Nearby garage versus detached garage: two worked budgets
| Cost component | Simple nearby garage | Detached or long feeder |
|---|---|---|
| Panel and protection | $450 | $600 |
| Feeder and raceway materials | $450 | $1,250 |
| Electrician labor | $900 | $1,800 |
| Permit and final testing | $200 | $350 |
| Site restoration/trenching | $0 | $1,500 |
| Illustrative total | $2,000 | $5,500 |
These totals compare project complexity rather than 60A versus 100A alone. A short 100A feeder in an accessible space can cost less than a 60A feeder routed through a long driveway. The exact wiring method, conductor type and local labor price determine the real estimate.
Garage Distance and Trenching Costs
A detached garage may require underground conductors, proper burial depth, suitable conduit, warnings, grounding electrode provisions and care around existing utilities. Trenching across landscaping is different from crossing concrete or asphalt. Request an itemized route and restoration price, not an unspecified ‘burial charge.’
Voltage drop also matters on a long feeder. Even when the conductor meets ampacity rules, a long circuit can require a larger conductor to maintain reasonable voltage under load. The electrician should evaluate both current-carrying capacity and voltage performance.
Neutral and Ground Must Be Correct
Subpanels are not wired like service disconnects. Neutral and equipment grounding connections must be configured according to the equipment listing and applicable electrical rules. Detached buildings have additional grounding considerations. Improper bonding can create unwanted current paths and dangerous touch conditions.
These design issues are a reason to avoid treating panel installation as a simple DIY enclosure swap. Ask the electrician to document feeder protection, grounding and circuit labeling in the final handover.
Can a 100A Subpanel Support an EV Charger?
Potentially—but the calculated service load, feeder demand and branch circuit are the real limiting factors. A 48A Level 2 charger commonly uses a 60A branch circuit; that does not mean every 60A garage feeder can simultaneously support the charger, workshop tools and other loads. The system must be evaluated as a whole.
Related guide: Do I Need 200 Amp Service for an EV Charger?.
When Is a Main Panel Upgrade Needed Instead?
A subpanel can solve a lack of physical breaker positions while leaving the service amperage unchanged. If the addition would exceed the approved calculated capacity, changing where breakers are mounted does not solve the problem. Some homes can use approved load management; others really need a service capacity upgrade.
Related guide: Do You Need an Electrical Panel Upgrade?.
Electrical Work Quote Checklist
- Amperage and brand/model of the new subpanel
- Breaker and feeder conductor sizes and route length
- Underground, attic or wall access method
- Garage circuits included, excluded or priced separately
- Grounding, surge protection and code compliance
- Permit, inspection and final circuit schedule
If the project includes a plug-in EV charger, pay attention to receptacle type, circuit protection and continuous-load instructions. The EV charger manufacturer may also impose installation requirements beyond a generic electrical rough-in.
Related guide: EV Charger Installation and Home Electrical System Requirements.
Bottom Line
Subpanel installation cost is usually a feeder-and-labor question before it is a panel-price question. Select 60A or 100A based on the actual loads and future plans, and compare projects with matching trenching, conductor, branch-circuit and inspection scopes.
About the author
I have practical experience in electrical construction and electrical project coordination in South Korea. For U.S.-focused guides, I research official codes, government data, utility documents, and manufacturer specifications to explain electrical and energy topics as accurately and practically as possible.
Sources & Official References
- U.S. DOE — EV Infrastructure Electrical Capacity Planning
- ESFI — Home Safety
- NFPA — National Electrical Code
- Historical 2023 subpanel installation price comparison — HomeGuide
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