If you're a St. Louis homeowner wondering whether your electrical panel needs an upgrade — and what it'll cost — you're not alone. It's one of the most common questions we get. The short answer: a panel upgrade in St. Louis typically costs between $1,800 and $4,500, depending on your home's current setup and what you need.
Here's a complete breakdown so you know exactly what to expect before you call an electrician.
St. Louis Panel Upgrade Cost by Amperage
| Service Size | Typical Cost Range | Best For |
|---|---|---|
| 100A replacement (same size) | $1,200 – $2,200 | Panel worn out but home load is small |
| 100A → 200A upgrade | $2,000 – $3,500 | Most St. Louis homes built before 1990 |
| 200A → 400A upgrade | $3,500 – $6,000+ | Large homes, EV chargers, additions |
| Federal Pacific / Zinsco replacement | $2,200 – $4,000 | Dangerous panel brands (see below) |
What's Included in the Price
A proper panel upgrade in St. Louis includes:
- New breaker panel (Square D, Eaton, or Siemens — we recommend all three)
- Coordination with Ameren Missouri for utility disconnect/reconnect
- Jefferson County or St. Louis County electrical permit
- Post-installation inspection by a licensed inspector
- Labor — typically 4 to 8 hours for a straightforward upgrade
What Drives the Cost Up
Old or Outdated Wiring
Many St. Louis homes built before 1985 have aluminum wiring, knob-and-tube circuits, or undersized branch circuits. If the panel upgrade reveals wiring that's not up to code, additional work may be needed. A good electrician will tell you this upfront — not after the job.
Panel Relocation
If your panel needs to move — say, from a hallway to a garage — expect an additional $800 to $2,000 for the relocation, depending on distance.
Meter Socket Replacement
If the meter socket (the weatherhead and box where power enters your home from Ameren's line) is old or damaged, it may need replacement as part of the upgrade. This adds $400 to $900 to the project.
💡 St. Louis Tip: Ameren Missouri sometimes requires a service upgrade when upgrading from 100A to 200A. We handle the Ameren coordination as part of every panel job — no headache for you.
Federal Pacific and Zinsco Panels
If your home was built between 1950 and 1990, there's a reasonable chance you have a Federal Pacific Stab-Lok or Zinsco panel. Both have well-documented failure modes — breakers that don't trip during overloads, increasing fire risk. If you have either brand, replacement is not optional. Most insurance companies in Missouri will not renew a policy on a home with a Federal Pacific panel.
Replacement cost for these panels runs $2,200 to $4,000 depending on amperage and any additional work required.
Is a Permit Required?
Yes — always. Any electrical panel work in St. Louis City, St. Louis County, Jefferson County, or St. Charles County requires a permit and inspection. Be very wary of any electrician who offers to skip the permit to save money. If something goes wrong — or if you sell your home — unpermitted electrical work is a serious problem.
How to Get an Accurate Estimate
The only way to get a truly accurate panel upgrade quote is an in-person evaluation. An electrician needs to see your current panel, assess your home's wiring, confirm the meter socket condition, and determine what Ameren Missouri will require for the utility side of the upgrade.
We offer free, no-obligation panel evaluations for St. Louis homeowners. Call {PHONE} to schedule.