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HomeServicesSubpanel installation cost

Cost Guide

Subpanel Installation Cost

Next Phase Electric is a licensed and insured electrical contractor in Covington, WA, installing subpanels for garages, shops and additions across South King and Pierce County.

Three things set most of the price: the distance from the main panel, the size of the feeder and whether the building is detached.

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Licensed, Bonded & Insured♦15+ Years Experience♦2,500+ Homes Served♦5.0★ on Google♦Background-Checked Technicians ♦ Code-Compliant Work ♦ Upfront Pricing ♦ Same-Day Service Available ♦ Permit Pulling & Inspections ♦ Covington & Nearby Cities ♦ Licensed, Bonded & Insured♦15+ Years Experience♦2,500+ Homes Served♦5.0★ on Google♦Background-Checked Technicians ♦ Code-Compliant Work ♦ Upfront Pricing ♦ Same-Day Service Available ♦ Permit Pulling & Inspections ♦ Covington & Nearby Cities ♦

What Drives the Cost

What Sets the Price

These six things decide the size of the job.

Distance From the Main Panel

A subpanel beside the main is the short job. One at the far end of the house needs a longer feeder.

Feeder Size

A 100-amp feeder uses heavier wire than a 60-amp feeder. We size it to what the subpanel will run.

Attached or Detached

A detached garage or shop needs an underground feeder in conduit, its own ground rods and a shutoff at the building.

Number of Circuits

The subpanel is one part of the job. Each new circuit from it, for tools, a charger or outlets, adds to it.

Room in the Main Panel

A subpanel adds breaker spaces, not capacity. If the main panel is at its limit, the fix is a panel upgrade.

Location

A subpanel needs clear working space in front of it, and it cannot go in a clothes closet or a bathroom.

Included

What the Price Covers

One flat price for the whole job.

A load calculation on the main panel

The subpanel, feeder breaker and feeder cable

Ground rods and a shutoff for a detached building

Electrical permit and inspection

You get the exact price first and approve it before any work starts.

Get My Price (253) 796-8658

Row of breakers with color-coded wires in a panel

5.0 on Google

2,500+ Homes Served

How It Works

How You Get Your Price

The exact price comes upfront. You approve it before any work starts.

You Book

Online or by phone. A technician reaches out within 1 business hour.

We Calculate the Load

Send a photo of the main panel and a list of what you want to run. We size the feeder and give you the exact price.

Installed and Inspected

A day for an attached garage or beside the main. A detached building with a trench takes two.

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FAQ

Common Questions

It depends on the distance from the main panel, the size of the feeder and whether the building is detached. You get the exact price after we see it, before any work starts.

Usually, when the main panel has spare capacity. A subpanel adds breaker spaces and does not involve the power company. If the service itself is too small, a subpanel does not help and the panel needs upgrading.

Yes. A separate building needs an underground feeder in conduit, its own ground rods and a shutoff at the building. It usually takes two days in place of one.

60 amps runs lights, outlets and one large tool. 100 amps covers a serious shop, or a shop plus an EV charger. We size it from the list of what you want to run, with room to add.

Often it is the cleanest way when both are at the same end of the house. One large feeder to a subpanel can serve both, in place of two long 50-amp runs. The main panel still has to carry both loads, so a load calculation decides it.

Yes. A subpanel needs an electrical permit and an inspection. We pull the permit and meet the inspector.