One of the most common questions we get before a panel upgrade: “How long will I be without power?” The short answer is most Houston panel upgrades take 4–8 hours, with power off for most of that time. Here’s what affects that timeline and what to expect on install day.
Typical Panel Upgrade Timeline in Houston
| Job Type | Typical Duration |
|---|---|
| Standard 100A → 200A upgrade | 4–6 hours |
| Panel replacement (same amperage) | 3–5 hours |
| Panel + meter base replacement | 6–8 hours |
| Panel + subpanel addition | 6–10 hours |
| Federal Pacific / Zinsco replacement | 5–8 hours |
What Happens During a Panel Upgrade
1. Permit pulled (before the job) In Houston, panel upgrades require a permit from the Houston Permitting Center or the relevant county. We pull this before scheduling install day. This step takes 1–3 business days.
2. Utility coordination CenterPoint Energy (Houston’s utility) sometimes needs to disconnect and reconnect the meter for panel work. We coordinate this in advance — CenterPoint’s response time varies, which is one reason panel upgrades are scheduled rather than same-day.
3. Main power shutoff On install day, your electrician shuts off the main breaker. This is when your home loses power.
4. Old panel removal The existing panel is de-energized and removed. All circuit breakers and wiring connections are documented.
5. New panel installation The new panel is mounted and the wiring from all circuits is reconnected. This is the most time-consuming part — a 200-amp panel with 20–30 circuits can take 2–3 hours to wire properly.
6. Grounding and bonding Texas electrical code requires proper grounding and bonding. Your electrician verifies and updates grounding rods, bonding conductors, and neutral/ground separation as required by current code.
7. Inspection After installation, a city or county inspector visits to verify the work. In Houston, inspections are typically scheduled 1–3 days after installation. Power is restored after inspection sign-off.
8. CenterPoint reconnect If the meter was pulled, CenterPoint reconnects after the inspection passes.
What Can Extend the Timeline
Meter base replacement — If the meter base (the box outside where power enters your home) is also outdated or damaged, it needs replacement alongside the panel. This adds 1–3 hours and requires CenterPoint coordination.
Federal Pacific or Zinsco panels — These panels were installed with wiring methods that don’t match modern standards. Reconnecting circuits to a new panel takes longer when the old wiring is non-standard.
Home age and wiring condition — Houston homes built before 1975 sometimes have wiring that needs remediation before it can safely connect to a new panel.
Adding circuits — If you’re adding new circuits during the upgrade (for an EV charger, generator, or new appliance), this adds time proportional to how much new wire needs to be run.
Inspection scheduling — The inspection is out of the electrician’s control. Houston and Harris County inspectors are generally efficient, but delays happen.
How to Prepare for Panel Upgrade Day
- Plan for a full day without power — even if the job finishes in 4 hours, budget the full day so you’re not caught off guard.
- Charge devices the night before — phones, laptops, medical equipment.
- Note anything in your freezer/fridge — 4–8 hours is within the safe range for most refrigerators, but move critical items to a cooler if you’re concerned.
- Identify your panel location — make sure the electrician has clear access. Move storage if needed.
- Know your CenterPoint account — occasionally utility coordination requires account verification.
Frequently Asked Questions
Can a panel upgrade be done in one day? Yes — the physical installation is completed in one day. The permit is pulled in advance, and the inspection happens 1–3 days after installation. Full project completion (permit to final inspection) typically takes 3–7 business days.
Will I need to be home during the panel upgrade? Yes — someone should be home during the installation. You’ll need to be available when power goes off and back on, and to sign off on the completed work.
Do I need to notify CenterPoint Energy for a panel upgrade in Houston? In most cases, yes — especially if the meter base is being replaced. We coordinate with CenterPoint as part of the job.
How long after a panel upgrade until the inspection? In Houston and Harris County, inspections are typically scheduled 1–3 business days after installation. We schedule the inspection as soon as the work is complete.
Is my home safe to use after the panel upgrade but before inspection? Yes — the new panel is fully functional and safe after installation. The inspection is a code compliance verification, not an indication that the work isn’t safe to use.
Ready to schedule a panel upgrade in Houston? Call Emergency Electrician Houston at (713) 322-5480 for a free estimate.