400 Amp Service Upgrade
Quick answer
A 400-amp service upgrade costs $4,000–$8,000+ and suits large homes and heavy loads, multiple EVs, pool equipment, workshops, large A/C. We engineer, permit, and coordinate the full upgrade.Typical installed cost: $4,000–$8,000
When 200 amps isn't enough, big square footage, two or three EVs, a pool, a shop, whole-home electrification, a 400-amp service delivers the capacity once and for all. It's a bigger job: often dual panels or a 320/400 meter base, always utility-coordinated.
About 400 Amp Service Upgrade
400-amp service is the answer when the load calculation simply doesn't fit in 200: estates and large homes, two or three EVs charging nightly, pool and spa equipment, a shop with welders or machine tools, or full electrification of a big footprint.
The typical build is a 320A-class meter base feeding two 200-amp panels, cleaner separation (house loads on one, garage/EV/shop on the other) and abundant breaker space. It's genuinely infrastructure: engineered, utility-coordinated, and done once.
Signs 200A won't be enough
- Load calculation lands above ~160A of computed demand
- Two or more EVs without willingness to load-share
- Pool/spa plus electric heating plus large A/C
- Workshop, ADU, or planned addition with major loads
How it works
Free assessment
A licensed electrician evaluates your panel, capacity, and site at no cost.
Transparent quote
You get a clear, written, fixed price, no surprises, no pressure.
Professional install
Tesla-certified electricians complete the work to code, permit pulled.
Inspection & warranty
We schedule inspection and back the work with our workmanship guarantee.
What's included
- Licensed, insured & Tesla-certified electrician
- Free in-home assessment and load calculation
- Permit pulled and inspection scheduled
- All materials and code-compliant wiring
- Clean, professional install with cleanup
- Workmanship guarantee of up to 10 years
Get a free 400 amp service upgrade estimate
Book your free in-home estimate
Pick a time that works for you and we will match you with a licensed, Tesla-certified electrician in your area. No obligation, transparent fixed pricing.
Book Your Free In-Home Consultation →Frequently asked questions
Large homes (4,500+ sq ft), multi-EV households, homes with pools/spas plus electric heating, or properties with a workshop or ADU. A load calculation confirms it before you spend.
Commonly a 320A-class meter base feeding two 200A panels, cleaner load separation and plenty of breaker space for future circuits.
Sometimes, the transformer or service drop may need attention, which the utility evaluates during coordination. We manage that process for you.
If the load calc says 200A fits, we'll tell you, we quote both paths. When 400A is right, doing it once beats two upgrades five years apart.
More electrical services
Electrical Panel Upgrade
An electrical panel upgrade to 200 amps typically costs $1,500–$4,000. It's often required before adding an EV charger, Powerwall, or major appliances. Charge Home Solutions uses licensed electricians and handles permits and inspection.
Learn more →Whole-House Rewiring
Whole-house rewiring replaces aging or unsafe wiring (knob-and-tube, aluminum, cloth) and typically costs $8,000–$20,000+ depending on home size.
Learn more →Circuit Breaker Replacement
Replacing a faulty or tripping circuit breaker restores safe power flow. Most single-breaker replacements are quick, same-day jobs.
Learn more →Generator Installation
Standby generator installation keeps your home powered automatically during outages. Installed cost typically runs $5,000–$15,000 including the transfer switch.
Learn more →