Determining junction box vs. sub-panel?

[weekendWarrior]

I was initially planning to run a new 15 amp circuit to the garage with a 12/2 NM-B cable about 25 feet. I intended to wire into a junction box. From there, I'd run PVC conduit with THHN wires throughout the garage to numerous 15 amp receptacles. At the moment, 15 amps will be more than adequate for my needs.

But then I was thinking. I envision needing more power in the future, and the toughest part is running the cable. Besides the initial cost of needing a more expensive wire, and a sub-panel being more than a junction box, are there other cons to future proofing and installing a sub panel for something that at first will only be used for a one low amp circuit?

 

[Dennis Alwon]

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