Homes built before 1970 often have 60 or 100 amp electrical service — adequate for the era's lighting, a refrigerator, and maybe an electric range. Today's homes draw more: central AC, electric water heater, heat pump, EV charger, home office equipment, modern kitchens with induction ranges. A 100A service that served a 1965 home well is often inadequate for 2026 loads. Service upgrades to 200A (or 400A for heavy electrification) are increasingly common.

This guide covers when upgrades make sense, the process, and 2026 costs.

This guide is organized the way the decision actually plays out in practice: what matters, what does not, and the reasoning behind each recommendation. Numbers and ranges reflect 2026 Connecticut, Massachusetts, and New York conditions and pricing.

Quick answer

100A service handles typical 2,000 sq ft home without electric heat, EV charging, or heat pump water heater. 200A service is the modern standard and handles most homes including moderate electrification. 400A service (two 200A meters or 400A main) is for heavy loads — multiple EV chargers, workshop, whole-home electrification, large homes. 2026 installed cost: panel upgrade without service change $1,800-$4,000; full 100A-to-200A upgrade $3,500-$7,500; 200A-to-400A upgrade $5,500-$12,000. Includes utility coordination for service disconnect and reconnect. Permit required; AHJ inspection mandatory.

Field context

Cost ranges published in a guide like this are benchmarks, not guarantees. Each range reflects a band within which most fair-market invoices actually land — low end for a clean, uncomplicated job in normal business hours, high end for predictable complications and peak-season pricing. The middle is where most real invoices sit. The ranges are built from trade-association wage data, aggregated regional cost-guide benchmarks, manufacturer and retailer equipment pricing, and current utility rebate schedules. Three important caveats follow from how the ranges are built.

First, the ranges are not negotiating targets. Contractors price to their local market, their own overhead and schedule, and the specific scope of the job in front of them. A contractor whose bid comes in near the middle of the published range is not overcharging; a contractor whose bid falls 15% below the low end is usually missing scope rather than offering a better deal. The useful pattern is three bids on identical written scope, not a single bid compared to the published range.

Second, the ranges shift materially with seasonality, location, and labor market conditions. Peak heating and cooling seasons push HVAC and plumbing invoices 10-20% higher than shoulder seasons. Coastal Connecticut, Boston metro, and New York City metro labor rates run 15-25% above national averages. The ranges here are calibrated to 2026 CT/MA/NY conditions; readers in markedly different markets should adjust expectations.

Third, cost is not the same as value. The lowest number that completes the job correctly, with licensed work by a contractor who stands behind it, is usually the cheapest outcome over a 10-year horizon even when it is not the cheapest invoice in the quote stack. Most homeowners who look back at a major project with regret report choosing on price alone.

Understanding amperage ratings

60A service

Pre-1960s era. Adequate for: lighting, basic appliances, maybe electric range. Inadequate for: central AC, electric heat, modern kitchen, EV charging, heat pumps. Modern upgrade required for nearly any significant electrical work.

100A service

1960s-1990s standard. Adequate for: typical 2,000 sq ft home with gas heat, single central AC, modern kitchen without induction. Marginal for: heat pump, EV charger, induction range, hot tub.

200A service

Modern standard (1980s-present). Adequate for: most homes including moderate electrification. Handles central AC + electric water heater + one EV charger + heat pump in most cases.

400A service

Heavy-electrification homes. Two 200A meters or one 400A main. Needed for: multiple EV chargers, large heat pumps in very cold climates with resistance backup, workshops with welders or large motors, large homes.

When to upgrade

Definitely upgrade

  • Adding EV charger to home with 100A service
  • Adding heat pump to home with 60A or 100A service
  • Adding induction range plus other new loads
  • Panel is obsolete (FPE, Zinsco, or generic)
  • Panel has no spare slots for new circuits
  • Service entrance cable is damaged or aging

Consider upgrade

  • Adding significant new load (hot tub, workshop, ADU)
  • Planning whole-home electrification over next 5-10 years
  • Selling a home where buyers will want modern capacity
  • Current panel is full and future work is planned

Don't upgrade

  • Current service is adequate and no new loads planned
  • Short-term ownership with no immediate need

The upgrade process

Step 1: Load calculation

Licensed electrician performs load calculation per NEC 220 to determine required service size.

Step 2: Permit application

Electrical permit from local AHJ. Utility coordination begins.

Step 3: Utility coordination

Utility schedules service disconnect. Typical 1-2 week lead time.

Step 4: Day-of work

  • Utility disconnects service at meter
  • Electrician removes old panel, meter base, and service entrance cable
  • New components installed: meter socket (sometimes upgraded), service entrance cable, panel, breakers
  • All existing circuits moved to new panel, properly sized breakers
  • Any AFCI/GFCI upgrades required by current code
  • Bonding and grounding to current standard

Step 5: AHJ inspection

Inspector reviews work before utility reconnects.

Step 6: Utility reconnect

Utility energizes new service. Typical same-day if inspection passes.

Full timeline: typically 3-5 weeks from decision to completion; 4-8 hours power-off during actual work.

What's included in a typical upgrade

  • New panel (200A main with appropriate breaker count)
  • New service entrance cable from meter to panel
  • New meter socket (may or may not be upgraded; utility specification)
  • New weatherhead and mast if overhead service
  • All AFCI and GFCI breakers required by current code
  • Panel labeling
  • Utility fees and permit
  • Cleanup and drywall patching (panel location may move slightly)

What's NOT typically included

  • Utility service line upgrade from pole/transformer (utility side; usually free but can have fees)
  • Rewiring existing circuits
  • Code compliance for other issues discovered (aluminum wiring, K&T)
  • Drywall repair beyond minor panel area

What it actually costs in 2026

National ranges.

Scope Low end Typical High end
Electrician diagnostic + load calculation $150 $275 $450
Panel replacement only (no service change, same amperage) $1,800 $2,800 $4,000
60A or 100A to 200A service upgrade (overhead service) $3,500 $5,200 $7,500
60A or 100A to 200A upgrade (underground service) $4,500 $6,800 $9,500
200A to 400A upgrade $5,500 $8,500 $12,000
Subpanel installation (without main service upgrade) $1,500 $2,800 $4,500
AFCI/GFCI breaker retrofit (required by current code) $500 $1,200 $2,500
Rewiring circuits during panel work $500 $2,500 $8,000
Service mast replacement $500 $900 $1,500
Meter base replacement $250 $450 $800
Drywall repair (panel location change) $300 $700 $1,500
Permit and inspection fees $150 $400 $1,000
Utility service change fees $0 $150 $450

When to call a professional

All service work is professional-only. This is 240V high-amperage work with utility coordination and code requirements.

Stela Home earns no referral fees from contractor connections.

Diligence and documentation

Diligence on cost management centers on three practices. First, written scope before any contractor conversations. A scope document listing every line item — equipment, labor, materials, permits, disposal, warranty terms — standardizes quotes and exposes where contractors are pricing differently. Second, three competitive bids on identical scope, not three contractor interviews followed by loose estimates. Third, license and insurance verification through the relevant state registry, plus two references on similar jobs completed in the preceding two years. These steps take a few hours and routinely save five to fifteen percent on the final invoice, independent of any negotiation.

Documentation at the back end matters as much as diligence at the front. A paid invoice with itemized scope, photographs of the completed work, and a record of any permits pulled belongs in the homeowner's records — not just for warranty claims but for the eventual resale, where a documented maintenance and improvement history routinely adds real value at closing. The homeowners who build this habit from day one of ownership tend to recover disproportionately more of their project costs when they sell; the homeowners who treat records casually tend to give money back at inspection.

Bottom line

The honest bottom line on cost: the right number is rarely the lowest quote. It is the lowest quote attached to complete scope, licensed work, and a contractor whose license, insurance, and references check out. Every one of those three items has quietly saved more money than bid negotiation in the long arc of home ownership.

Related Stela Home coverage

How Stela Home helps

Three Stela Home tools work together on this kind of decision:

  • Stela Report — pre-purchase property intelligence with disclosure, condition, and risk flags.
  • Repair Calculator — modeled cost ranges by category and ZIP, calibrated with regional and complexity multipliers.
  • Stela Guides — step-by-step repair walkthroughs reviewed by licensed professionals, with safety callouts and disclosure.

Sources and further reading