// Compare · Panel Upgrade vs Subpanel · NYC
Panel Upgrade vs Subpanel
Out of breaker space? You have two paths: upgrade the main panel or add a subpanel. They solve different problems — and choosing wrong wastes money. Here's how to tell them apart.
Panel Upgrade
Replace/enlarge the main panel — more total capacity
Subpanel
Add a secondary panel — more circuits, same service
A subpanel adds circuits; a panel upgrade adds capacity. Which you need depends on whether you're out of space or out of power.
If your main panel has plenty of total amperage but no empty slots, a subpanel is the efficient fix — it branches off the main to host more circuits, often near where the new loads are (a finished basement, garage, or addition). If you're actually maxing out your service capacity — adding an EV charger, heat pump, and more on an already-loaded 100A service — then a panel/service upgrade is the real answer. A load calculation tells you which problem you have.
Panel Upgrade vs Subpanel: the full comparison
| Factor | Panel Upgrade | Subpanel |
|---|---|---|
| What it solves | Not enough total capacity (amperage) | Not enough breaker spaces |
| Adds capacity? | Yes — increases total available power | No — redistributes existing capacity |
| Adds circuit slots? | Yes | Yes |
| Typical NYC cost | $1,800–$4,500 (incl. service upgrade) | $900–$1,800 |
| Best when | Service is maxed; adding EV + heat pump etc. | Main has capacity but no free slots |
| Common use | Whole-home electrification, older small panels | Basement, garage, addition, ADU |
| ConEd involvement | Yes if increasing amperage | No |
| Future headroom | Highest | Moderate — limited by main service |
How to choose
✅ Choose Panel Upgrade if…
- You're genuinely out of service capacity, not just slots
- You're adding several big loads (EV + heat pump + induction)
- Your panel is old, recalled, or a fuse box
- A load calculation shows you're near or over capacity
- You want maximum long-term headroom
✅ Choose Subpanel if…
- Your main panel has capacity but no empty breaker spaces
- You're powering a specific area — basement, garage, addition, ADU
- You want to add circuits without ConEd or a service increase
- The new loads are concentrated in one part of the home
The NYC angle
The classic NYC scenario: a homeowner finishing a basement or adding a few circuits assumes they need a full service upgrade, when a subpanel ($900–$1,800) does the job for far less. The opposite also happens — someone adds a subpanel to a service that's already maxed, and the breakers just trip downstream.
We run the load calculation first, free, and tell you which you actually need. Sometimes it's a subpanel near the new work; sometimes it's a true upgrade with ConEd coordination. See pricing on our panel upgrade cost guide.
Out of space, or out of power?
We run a free load calculation to tell you whether a subpanel or a full upgrade is the right, cost-effective fix — and quote only what you need.
Panel Upgrade vs Subpanel: common questions
A panel upgrade replaces or enlarges your main panel and can increase total service capacity (amperage). A subpanel is a secondary panel fed from the main — it adds breaker spaces but doesn't add total capacity. Upgrade for more power; subpanel for more circuits when you already have the power.
A subpanel is usually cheaper — $900–$1,800 versus $1,800–$4,500 for a panel/service upgrade — because it doesn't require ConEd coordination or a new meter. But it only helps if your main service has spare capacity. The wrong cheaper option solves nothing.
If your main service has the capacity, yes — a subpanel can host the EV circuit. If your service is already near its limit, you'll need a panel/service upgrade instead. A load calculation determines which applies to your home.
Yes — installing a subpanel is permitted work under the NYC Electrical Code, just like a panel upgrade. We file the DOB permit, perform the work to code, and handle inspection and sign-off.
A load calculation — totaling your real and planned loads against your service rating — is the definitive answer. Practical signs of a maxed service include lights dimming when big appliances start and breakers tripping under normal use. We calculate it free before recommending anything.
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