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Run wire or mount boxes on the wall
Most electrical codes require just one outlet in the garage. And
that's just what most builders give you—one measly outlet for
all your tools and toys. If you have open studs, you can easily
run wire and add outlets as long as you follow a few basic rules
(find articles about garage wiring here).
If your walls are covered, you don't have to cut into them to run
wires. Instead, you can mount metal or plastic wiring channels
and outlet boxes right on the wall.