Panel UpgradesJuly 3, 20266 min read

When to Upgrade From a 100-Amp to 200-Amp Panel (Texas Homeowner's Guide)

About 40% of the DFW homes we service still have 100-amp panels — most from the 1970s and 80s. Not every one needs an upgrade. Here's the honest breakdown.

6 Signs You Actually Need 200 Amps

You're adding an EV charger over 32A — a 48A hardwired charger alone eats half a 100A service

You're adding a second AC unit or heat pump — a 4-ton heat pump can pull 45–60 amps under startup

Whole-home generator over 14 kW — the ATS needs headroom

4. Frequent main-breaker trips in summer when AC + dryer + oven run together

Panel is FPE, Zinsco, or Pushmatic — upgrade for safety regardless of amperage (see our [Federal Pacific panel guide](/blog/federal-pacific-panel-replacement-burleson-tx))

You're planning a kitchen remodel, addition, or pool — code will require more dedicated circuits than a 100A panel can supply

When You DON'T Need to Upgrade

Single AC, gas dryer/oven/water heater, no EV — 100A is usually plenty

You just want "more breaker slots" — a sub-panel off the existing 100A service is often $800–$1,400, versus $2,400–$3,400 for a full upgrade

Adding one NEMA 14-50 for occasional EV charging + load management device — $200–$400 vs full upgrade

Cost of Upgrading in DFW (2026)

| Scope | Installed Price |

|---|---|

| 100A → 200A, existing meter base OK | $2,400 – $2,900 |

| 100A → 200A + new meter base/mast | $2,900 – $3,400 |

| 100A → 200A + Oncor service drop upgrade | $3,400 – $4,200 |

| Add: sub-panel for detached garage/shop | $1,200 – $2,400 |

Includes permit, city inspection, Oncor disconnect/reconnect, and modern Square D, Eaton, or Siemens panel with AFCI/GFCI breakers per current code.

What Actually Happens on Upgrade Day

1. Oncor disconnects power around 8 AM

2. Old panel and (if needed) meter base removed

3. New 200A panel and copper grounding installed — 4 to 6 hours

4. City inspector arrives mid-afternoon

5. Oncor reconnects — usually by 5–6 PM

6. We test every circuit and walk you through the new panel

Most homes are without power for 6–9 hours on install day. We schedule around your work-from-home needs when possible.

The Load-Management Shortcut

For homeowners who only need to add an EV charger, a device like the Wallbox Pulsar Plus or Emporia EV Charger with load balancing costs $200–$400 more than a plain charger but avoids the $2,400+ panel upgrade. It monitors total home draw and throttles the EV charger when the house is under heavy load. Works on 90%+ of 100A DFW homes.

Free Load Assessment

Not sure which path is right? Text a photo of your panel + a list of what you want to add (EV, AC, pool, generator) to (817) 447-7141. We'll tell you honestly whether you need a full upgrade or a cheaper fix. See our [panel upgrade service page](/services/panel-upgrades) for more details.