Sub panel

Yes, a sub panel comes with the electrical package

If a container is getting outlets, switches and lighting roughed in, a sub panel is the piece that makes all of it work as one system rather than a bundle of separate runs. It's not an upgrade you have to ask for, it's the starting point of the electrical package itself.

What isn't fixed is the size and the circuit count. That part changes with the job, and it's worth understanding what actually drives it before you order one.

What changes the panel size

How many circuits a sub panel needs depends on what's plugged into the box at once, not on the container's length. A single circuit for basic lighting and a couple of outlets is a small panel. A workshop running power tools, a mini-split and full lighting on separate circuits needs more breaker slots and a heavier feed to match, so nothing trips when it's all running at the same time.

A finished office with a mini-split, outlets for equipment and dedicated lighting circuits sits at the larger end. Plain storage that only ever needs a light and one outlet sits at the small end. We rough in to match what you tell us will actually run, not a default size.

What feeds the sub panel

A sub panel doesn't generate power on its own, it takes a single feed, from a generator, a nearby building's panel, or a service run to the container, and distributes it into the individual circuits inside. What that main source looks like is part of the plan we work out before wiring starts, since it changes how the feed gets run.

The line between our shop and the electrician

The panel itself, the conduit runs and the fixture boxes are ours to set up, and we do that cleanly enough that whoever finishes the job has an easy time of it. That last step, tying power to the panel and clearing it through your local inspector, belongs to a licensed electrician, and it's not something our shop is set up to sign off on ourselves.