Do I Need 200 Amp Service?

The quick self-assessment

• EV (or two) in your future → 200A is the comfortable answer
• Heat pump replacing gas heat → major new load; usually yes
• Battery/solar plans → 200A simplifies everything
• Gas heat, gas water, no EV plans → 100–150A often suffices
• Panel already full of tandem breakers → capacity aside, you're out of room

What 200 amps actually buys

Roughly double a 100A service's capacity, enough to run an EV charger, heat pump, modern kitchen, and A/C simultaneously with headroom left. It's the standard new-construction service for a reason: every electrification decision afterward becomes 'add a breaker' instead of 'call the utility.'

The economics favor doing it once: a 200A upgrade runs $1,500–$4,000, and bundling it with the project that triggered it (charger, battery, heat pump) saves a second mobilization. The 25C federal credit that used to help with this ended after December 31, 2025; the IRA Home Energy Rebates can still put up to $4,000 toward a panel for income-qualified households (under 150% of Area Median Income) in states where the program is live.

When to skip it

Genuinely modest, stable loads, smaller home, gas appliances, no electrification plans, don't need the upgrade, and smart load management can squeeze an EV charger into many 100–150A homes. We'll tell you plainly when the calculation says keep your money.

The arithmetic behind the answer

Service sizing is codified math, not opinion. A load calculation totals your general lighting load (3W per square foot), small-appliance and laundry circuits, fixed appliances, and the largest of heating or cooling, with code-prescribed demand factors reflecting that not everything runs at once. The result lands in amps, and the comparison against your service rating settles the question.

Worked example: a 2,200 sq ft gas-heated home with central air, electric dryer, and dishwasher computes around 80–95 amps, comfortable on 100A service until a 48A EV charger enters, which is exactly when the math (and the code) starts pointing at 200.

What homeowners regret, in both directions

The under-buyers' regret: paying mobilization, permitting, and utility coordination twice because a 'minimal fix' preceded the real upgrade by two years. It's the most expensive common sequencing error in residential electrical.

The over-buyers' regret is rarer but real: a $7,000 400-amp service on a home whose load calculation justified half of it, sold on 'future-proofing' that never arrived. The corrective for both is the same twenty-minute calculation, which is why we run it before quoting rather than after objections.

What the upgrade day actually involves

Knowing the choreography makes the decision less abstract. Morning: utility disconnects at the drop, old panel comes off the wall, service entrance and grounding get brought to current code. Midday: the new 200A panel mounts, every existing circuit re-terminates onto labeled breakers, surge protection and code-required AFCI/GFCI breakers land. Afternoon: utility reconnects, inspector signs off (same-day in many jurisdictions), power returns, typically 4–8 hours of planned outage total.

Refrigerators ride through it fine closed; work-from-home households plan around the window or borrow a hotspot. By evening the house runs on infrastructure sized for its next thirty years, and every future project starts with 'add a breaker' instead of 'call the utility.'

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