Panels and Electrical Service
400 amp service upgrades for large Grand Rapids homes with heavy loads
Some homes simply outgrow 200 amps: two EV chargers, heat pumps, a pool heater, a workshop and a big kitchen running together. A 400 amp service splits the house across two 200 amp panels, and it involves the utility far more than a normal upgrade. We run the load calculation, coordinate with Consumers Energy, and plan the changeover.
Updated September 2026
- Answered 24/7
- Load calculation first
- Utility transformer coordination
- Permit and inspection
Quick answer
A 400 amp service upgrade in Grand Rapids usually installs a 400 amp class meter base feeding two 200 amp panels, for large homes carrying several heavy loads such as multiple EV chargers, heat pumps, pools and workshops. The utility often has to upgrade its transformer or service drop. Regional costs commonly run $3,000 to $6,000, before utility-side work.
What this job is
When 200 amps is genuinely not enough
Most homes do not need 400 amps, even with an EV charger. A load calculation often shows a 200 amp service with load management will carry the plan. Where it genuinely will not, typically large homes with two chargers, electric heat, a pool and a shop, 400 amp service is the answer. We show you the numbers either way, rather than recommending the biggest service by default.
Cost factors
What moves the price on this job
The utility work and the panel layout decide most of the price.
Typical regional ranges: 400 amp service upgrades $3,000 to $6,000, before any utility-side charges. Planning figures, not our price.
- 01
Utility transformer
Utility-side upgrades can add cost and time.
- 02
Meter base
400 amp class meter base and disconnects.
- 03
Panel placement
Two panels need wall space and clearances.
- 04
Circuits moved
Rebalancing loads across both panels.
- 05
Grounding
Electrode and bonding sized for the service.
- 06
Outdoor disconnects
Required under current Michigan code.
- 07
Permit and inspection
Required before energizing.
Choosing between them
Getting more capacity: the realistic choices
| Option | Best for | Trade-off |
|---|---|---|
| 200 amp with load management | One or two large new loads | Some loads throttle at peak times |
| 400 amp dual-panel service | Several heavy continuous loads | Utility transformer work and cost |
| Separate service to an outbuilding | Large shops or barns | A second meter and utility account |
The versions of this job
Dual 200 amp panels
A 400 amp residential service is usually built as a 400 amp class meter base with two 200 amp main disconnects feeding two panels. Circuits are split between them so the heavy loads are balanced: often one panel for the main house and one for the garage, chargers, pool and shop. We plan the split with the load calculation, place both panels where they have clear working space, and label every circuit so it is obvious which panel feeds what.
Large home with EV and heat pump
Two EV chargers and a heat pump are the combination that most often pushes a large home past 200 amps, because all three can run for hours at the same time on a winter evening. We calculate those loads alongside the range, dryer and water heater, test whether load management would do the job, and only then recommend the larger service. Where 400 amps is right, the chargers and heat pump go on circuits planned for them from the start.
Workshop and pool loads
Pools bring pumps, heaters and lighting; workshops bring welders, compressors and dust collection. Together with a large house they can exceed a 200 amp service on a busy afternoon. In a 400 amp setup, these loads usually move to the second panel, which keeps them from affecting the house and simplifies future additions. Pool bonding and GFCI requirements are handled as part of the same job, so nothing has to be reopened. A spa circuit can be planned into the same panel if one is on the wish list.
Utility transformer coordination
The utility side is what makes a 400 amp upgrade different. The existing transformer or service drop may be too small, and Consumers Energy has to size and schedule its own work. We submit the load information the utility asks for, coordinate the disconnect, meter and reconnect dates, and schedule the inspection so the new service can be energized as soon as the utility's crew has upsized their equipment, with the house off power for the shortest possible window that day.
Local conditions
Why this looks different across Grand Rapids
After the June 2026 wind storms, Consumers Energy had more than 100,000 customers out statewide and staged extra crews in Walker. Utility crews are the constraint on any service change that needs transformer work, so on a 400 amp job we get the utility request in first and avoid scheduling the changeover in the middle of storm season if the house can wait.
Time on site
How long a 400 amp upgrade takes
The on-site changeover is usually one to two days, but the utility sets the overall schedule, because a 400 amp service often needs a larger transformer or a new service drop. We submit the utility request early, plan the interior work so it is ready when the utility is, and keep the power-off window as short as the sequence allows.
How the job runs
How a 400 amp upgrade runs
Load calculation
Confirm 400 amps is really needed.
Utility request
Load details sent to Consumers Energy.
Plan the panels
Circuit split and locations.
Permit filed
Before any work starts.
Changeover
Meter base, disconnects and dual panels.
Inspection and energize
Signed off, utility reconnects.
Service equipment from Square D, Eaton and Siemens.
Straight answers
Questions about 400 amp service upgrade in Grand Rapids
Still unsure? Call (616) 699-4794 and ask a technician.
Only if a load calculation shows 200 amps with load management cannot carry your planned loads.
Typical regional ranges run $3,000 to $6,000, before any utility-side charges.
The transformer or service drop may need upsizing for 400 amps.
Usually one to two days on site; the utility's schedule sets the overall timeline.
A subpanel adds spaces, not capacity; 400 amps adds capacity.
Same category
