If your panel is a 100-amp Federal Pacific, a 60-amp fuse box, or a 30-year-old Zinsco, the question is no longer if you should upgrade — it's what size. Tech Energy America has been pulling panel swaps in Maricopa County since 2009, and the answer in 2026 is almost never "keep the 100A." This guide breaks down what a 200-amp or 400-amp panel upgrade actually costs in Scottsdale and the greater Phoenix metro, when 400 amps makes sense, and what a complete quote should include.
Quick price snapshot — Scottsdale, AZ, 2026
| Upgrade scope | Typical cost | Timeline |
|---|---|---|
| 100A → 200A meter/main, panel only | $2,400 – $3,800 | 1 day on-site |
| 100A → 200A with service-entry rewire + grounding | $3,500 – $5,500 | 1–2 days on-site |
| 100A → 400A (split 200/200 or single 400A switchgear) | $7,500 – $14,000 | 2–3 days + utility coord |
| Add: APS / SRP utility coordination, mast, weatherhead | + $400 – $1,200 | 1–3 weeks lead |
| Add: panel relocation (interior to garage exterior) | + $1,200 – $3,000 | + 1 day on-site |
These are full turnkey ranges including permit fees, AHJ inspection, materials, labor, and a final walk. Older homes with cloth-wire branch circuits, knob-and-tube, or aluminum branch wiring will add $1,500 – $4,000 for the wiring corrections required to pass inspection on a service upgrade.
When 200 amps is plenty
The classic Scottsdale 3-bedroom ranch with central AC, electric range, electric water heater, and one EV charger lands comfortably inside a 200-amp panel. A correctly executed NEC 220.83 load calculation usually shows demand in the 90–140A range for that home. 200A gives you a 30–50% headroom buffer, room for a future heat pump conversion, and breaker space for circuit additions over the next 15+ years.
You're a candidate for 200A if you check most of these:
- Single-family home under 3,500 sq ft
- One central AC system (15 SEER or higher — modern equipment runs efficiently)
- One EV charger planned (Level 2, 32–48A)
- No plans for a second 11kW+ EV charger, second AC condenser, or whole-home generator transfer switch above 14kW
- No detached ADU or workshop with its own subpanel above 100A
When you actually need 400 amps
400A service is no longer just for mansions. Here's the modern Phoenix profile that justifies the jump:
- 5,000+ sq ft home with two AC zones, dual electric ranges, or a heat-pump pool heater (these alone can push past 200A demand)
- Two EVs charging simultaneously on Level 2 chargers (48A + 48A = 96A peak, before load management)
- Whole-home backup generator or battery system with 20kW+ transfer switch — utility-required service derating often forces 400A
- ADU / casita / workshop separately metered or fed with a 100–200A subpanel — Arizona DOE allows up to two dwelling units on one residential service if sized correctly
- Commercial-rated equipment at the home: 60A welder, kiln, 3-phase tool fed from a converter — these double the diversified demand quickly
- Future-proofing for solar PV + battery + bidirectional EV charging — the "all-electric" home of 2030 wants 320–400A headroom
Two configurations are common for 400A: 400A meter with dual 200A panels (cleaner load segregation, easier troubleshooting) or a single 400A panel (lower equipment cost, single point of disconnect). Tech Energy America's 2026 spec defaults to dual 200A panels for AZ residential because APS / SRP service-entrance conduit fill calculations work out better and the homeowner has clearer breaker organization.
What a complete 200A or 400A panel upgrade quote should include
This is where bad bids fall apart. A complete Tech Energy America electrical services quote covers:
- Load calculation per NEC 220.83 (existing dwelling) or 220.82 (new dwelling) — documented, not eyeballed
- Meter and main breaker — utility-listed combination service entrance device (Square D RC-series, Eaton CHB, Siemens MC). For 400A, that's a 400A meter with a 400A main or split 200A/200A.
- Service entrance conductors — 4/0 aluminum URD for 200A, 600 kcmil aluminum URD or 350 kcmil copper for 400A, sized per NEC 310.16 + utility derate
- Grounding electrode system — minimum 2 ground rods 6 ft apart, bonded with #6 copper, plus water pipe bond and concrete-encased electrode (Ufer) if accessible
- Mast and weatherhead — if overhead service, 2" rigid steel mast with proper height clearance over the roof, fall arrest if working at height
- Underground conduit — Schedule 80 PVC for the riser portion, Schedule 40 below grade, sized for the service entrance bundle plus 25% capacity
- Permit + inspection fees from the AHJ (Scottsdale, Phoenix, Tempe, etc. each have different fee schedules — typically $250–$650 for residential panel upgrades in 2026)
- Utility coordination with APS or SRP — service order, meter pull/reset appointment, temporary power if needed
- AFCI / GFCI compliance check on all branch circuits per NEC 2023 — many older panels will trigger required AFCI breaker installs to pass inspection
- Surge protective device (SPD) — required at the service per NEC 230.67 since 2020; install a Type 1 or Type 2 whole-home surge protector at the panel
- Labeling, panel directory, final walk + photos of every connection torqued to spec
If a quote is missing any of these line items, it's not actually a complete quote — and you'll likely see change orders during the work that push the final bill 20–35% over the original number.
APS vs SRP — what changes
If your service is fed from APS (Arizona Public Service), you'll typically get a same-week or next-week meter pull appointment once the permit is approved. APS uses standard meter-main combos (RC and CSED designations); their service planner desk in Phoenix is fast but rigid on specs.
If your service is fed from SRP (Salt River Project) — most of east valley, Tempe, Mesa, Gilbert, Chandler — expect 2–4 weeks for the utility coordination. SRP's spec for 400A residential is slightly different (they prefer Eaton 400A meter-main combos for new installs) and the connection charge is sometimes itemized separately on your first SRP bill after the upgrade.
For homes in the Buckeye, Maricopa, or Queen Creek growth corridors fed by Trico, Aqua Fria, or specific co-ops, lead times can stretch to 6–8 weeks for service orders. Always check who feeds your meter before quoting a project schedule.
Why a 100A panel from the 1980s should usually be replaced — even if it "still works"
The most dangerous panels we see in Scottsdale and Phoenix are Federal Pacific Stab-Lok (1970s–80s), Zinsco (1960s–70s), and certain pre-1990 Sylvania panels. These have documented failure modes where the breakers fail to trip on overload, causing arc faults inside the bus that can ignite the panel itself. We recommend replacing them on principle — even if the homeowner's insurance hasn't flagged it yet.
Modern 200A panels from Square D (QO and Homeline), Eaton (BR and CH), or Siemens (P-series) add AFCI, GFCI, and surge protection per current code, dramatically reducing fire risk.
Panel brands we install and stock
Tech Energy America is an authorized distributor for Square D, Eaton, and Siemens residential and commercial panelboards. Standard 200A QO meter-mains ship same-day from our Scottsdale warehouse. 400A meter combinations and 200A/200A dual splits typically have 1–2 week lead times from the manufacturer.
For more on choosing panel brands for commercial projects, see our Square D vs Eaton vs Siemens panelboard comparison.
Common questions
How long does a panel upgrade take?
Most 200A upgrades are completed in one day of on-site work. 400A upgrades or panel relocations are typically 2–3 days. Add 1–3 weeks for utility coordination and permit approval before the work starts.
Will my power be off the whole time?
Power is off only during the actual meter swap and main feeder reconnection — typically 4–6 hours on the upgrade day. We schedule it for the cooler part of the morning, and most homeowners pre-cool the house and run the refrigerator on the highest setting to coast through.
Do I need to upgrade the wiring inside my house too?
Not necessarily — branch circuits that are correctly sized to existing breakers don't need replacement. However, if you have aluminum branch wiring, knob-and-tube, or significant DIY work, the panel upgrade will expose those issues and inspectors will require corrections to pass.
Is permitting required?
Yes. Every panel upgrade in Maricopa, Pima, Pinal, Coconino, and Yavapai counties requires a permit from the local AHJ. Pulling a panel without a permit voids your homeowner's insurance, and the next buyer's inspection will flag it. Tech Energy America pulls permits as a standard part of every quote.
Can I get a panel upgrade for less than the ranges above?
Bids well below $2,000 for a 200A upgrade in 2026 are almost always missing line items — typically the SPD, the AFCI breakers, or the proper service entrance grounding. They're also a common indicator of unlicensed work, which won't pass inspection. Get a real quote from a licensed contractor and compare apples to apples.
Related reading
- More articles on the Tech Energy America blog
- Square D vs Eaton vs Siemens panelboards
- Electrical contracting services in Arizona & New Mexico
- Wholesale electrical distribution — JST, CME, Priority Wire, Southwire
Need a panel upgrade quote in the Phoenix metro?
Tech Energy America is an authorized electrical distributor. We respond to quote requests in 24–48 hours; permitting and installation are handled by licensed partners.
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