⚡ Quick answer: You likely need a 200-amp upgrade if a load calculation shows your 100–125-amp panel can't carry your real loads — the common Vegas triggers are adding an EV charger, a spa/pool, a larger AC, or converting gas appliances to electric. A full upgrade replaces the panel, main breaker, grounding, and often the meter/mast with NV Energy coordinating a cut-over, all permitted and inspected. Price moves mainly with service-entrance condition, relocation, and how much existing wiring must be brought to code. If the calc says you fit, we'll tell you — subpanels and load management are honest, cheaper alternatives.
Panel upgrades are where "trust me, you need it" gets said a lot in this industry. So let's do the opposite: here's the actual decision logic we use, the real scope of the work, and the cases where the honest answer is "you don't need one."
The Vegas loads that outgrow old panels
Large parts of the valley — especially homes built from the 1970s through the early 1990s — run on 100–125-amp panels sized for a different era. Then modern life arrives:
- Air conditioning — a 4–5 ton system is the single biggest draw in most Vegas homes, running for hours continuously all summer.
- EV charging — a Level 2 charger adds a continuous 30–48A load, usually at night… unless it overlaps evening AC runtime, which in July it does. (Full breakdown: EV charger installation cost.)
- Spas and pools — 50–60A for a spa; pumps and heaters for pools.
- Gas-to-electric conversions — induction ranges, electric dryers, heat-pump water heaters.
Any two of those on a 100-amp panel and the load calculation — the NEC math that adds your real demands — starts coming up short. That calculation, not a salesperson's vibe, is the trigger.
What a real upgrade involves
- Load calc and design — confirm 200A is needed and plan breaker layout.
- Permit with the local jurisdiction (Las Vegas, Henderson, North Las Vegas, or Clark County).
- NV Energy coordination — the utility disconnects service for the cut-over; on most jobs you're without power for part of one day.
- The physical work — new 200A panel and main breaker, new grounding electrode system to current code, often a new meter socket and service mast, arc-fault/ground-fault protection where required, every circuit landed and labeled.
- Inspection — the jurisdiction signs off; NV Energy restores service.
Where the price moves: the condition of your service entrance (mast, meter socket, service conductors), whether the panel must relocate, how many existing circuits need code corrections once opened, and jurisdiction fees. A clean like-for-like upgrade on a healthy service entrance is the friendly end; a relocated panel with a new mast and aluminum-branch remediation is the other end.
Get the load calc before anyone sells you a panel.
We'll run the numbers and tell you straight — upgrade, subpanel, or "you're fine."
📞 Call 702-808-8861The honest alternatives
- A subpanel — if your main has capacity but no breaker spaces, a subpanel adds slots for a fraction of the cost. Capacity problem? No. Space problem? Yes.
- Load management — smart devices that pause the EV charger while the dryer or AC runs can keep a marginal 125A home legal and functional.
- Efficiency swaps — when an aging 5-ton AC is near end-of-life anyway, a modern high-SEER2 replacement can drop enough amps to make the rest of the plan fit. As a dual-licensed HVAC + electrical shop, we can actually run both sides of that math for you.
Signs you shouldn't wait
Chronic multi-circuit tripping (see our breaker guide), warm or buzzing panel, flickering when big loads start, a known-defective legacy panel brand, or any hot smell at the panel — those aren't "someday" items. One of the most-praised jobs in our reviews is exactly this work: a 100A→225A Square D upgrade, clean install, every breaker labeled. That's the standard.
Frequently asked questions
How do I know if I need a 200-amp panel upgrade?
A load calculation is the real test: it adds your actual loads (AC, EV, spa, appliances) against your panel rating. Common triggers are adding an EV charger or spa to a 100–125-amp home. If the calc says you fit, you don't need the upgrade — and an honest electrician will say so.
How long does a panel upgrade take, and will I lose power?
Typically one day for the swap, with power off for part of it while NV Energy cuts over service and the new panel is landed. Permits and utility scheduling add lead time before the work day.
Can I avoid an upgrade with a load-managed EV charger?
Often, yes. Load-sharing chargers pause or throttle charging while other big loads run, keeping a marginal panel within its rating. It's a legitimate, code-recognized alternative when the calculation is close.