A 100-amp to 200-amp panel upgrade in Simi Valley runs about $2,600 to $4,500 in 2026. Removing an old fuse box, relocating the meter, or going underground pushes it higher — and if you're upgrading to add an EV charger, the SCE rebate can offset much of it.
Many of Simi Valley's 1970s–90s ranch homes in Madera, Bridle Path, and Wood Ranch still run their original 100- or 125-amp panels. Add central AC, an electric range, and an EV, and that capacity runs out fast. Here's what an upgrade actually costs, line by line.
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Cost by scope
| Scope | Typical cost |
|---|---|
| 100A → 200A upgrade | $2,600 – $4,500 |
| Old fuse box / split-bus → 200A | $3,000 – $5,000 |
| Add meter relocation | + $1,200 – $1,800 |
| Convert overhead → underground | + $2,000 – $3,500 |
| 200A → 400A service | $5,200 – $9,000 |
What drives the price
The base upgrade covers the new 200-amp panel, breakers, grounding, a load calculation, and SCE coordination. Beyond that, the big swing factors are: whether the meter has to move, whether your service is overhead or underground, whether an old fuse box or split-bus panel needs removing, and any drywall patching where the panel ties in.
Permits & timeline in Simi Valley
A panel upgrade requires a permit through Simi Valley Building & Safetyplus coordination with SCE to disconnect and reconnect service. On-site work is usually one day; the full process runs 2 to 4 weeks. We handle the permit, the load calc, the utility scheduling, and the final inspection.
Upgrading for an EV? You may get $4,200 back.
Simi Valley is SCE territory — pair the upgrade with a charger and the Charge Ready Home rebate can cover up to $4,200 (income-qualified).
Estimate my net cost →Related: Panel upgrades in Simi Valley, the SCE $4,200 rebate guide, and FPE / Zinsco panel replacement. Safeway Construction — Lic. #1066117, 5.0 stars on Google.